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CodingStyle chapter 2:
"[...] never break user-visible strings such as printk messages,
because that breaks the ability to grep for them."
This patch unsplits user-visible strings.
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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btrfs_rm_device frees the block device but then re-opens it using
the saved device name. A race exists between the close and the
re-open that allows the block size to be changed. The result
is getting stuck forever in the reclaim loop in __getblk_slow.
This patch moves the superblock cleanup before closing the block
device, which is also consistent with other callers. We also don't
need a private copy of dev_name as the whole routine operates under
the uuid_mutex.
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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In a corrupted btrfs image, we can come across this BUG_ON and
get an unreponsive system, but if we return errors instead,
its caller can handle everything gracefully by aborting the current
transaction.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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We don't track the reloc roots in any sort of normal way, so the only way the
root/commit_root nodes get free'd is if the relocation finishes successfully and
the reloc root is deleted. Fix this by free'ing them in free_reloc_roots.
Thanks,
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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Remove unneeded variables and assignments.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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Code undo operations in power enable errror path explicitly, instead of
reusing power disable path and playing with return values there.
Signed-off-by: Nikita Yushchenko <nikita.yoush@cogentembedded.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
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We need to check items in a node to make sure that we're reading
a valid one, otherwise we could get various crashes while processing
delayed_refs.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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Add device tree property to define auxiliary devices to be added to
simle-audio-card.
Together with proper audio routing definition, this allows to use
simple-card in setups where separate amplifier chip is connected to
codec's output.
Signed-off-by: Nikita Yushchenko <nikita.yoush@cogentembedded.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
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Somehow we missed btrfs_print_tree when last time we
updated error handling for read_extent_block().
This keeps us from getting a NULL pointer panic when
btrfs_print_tree's read_extent_block() fails.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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Since we could get errors from the concurrent aborted transaction,
the check of this BUG_ON in start_transaction is not true any more.
Say, while flushing free space cache inode's dirty pages,
btrfs_finish_ordered_io
-> btrfs_join_transaction_nolock
(the transaction has been aborted.)
-> BUG_ON(type == TRANS_JOIN_NOLOCK);
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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The booting process for the DSP is clearly separated into two parts, the
preloader brings up the core and downloads code, then the main widget
starts the code actually executing. However the shutdown sequence is all
handled with the main widget.
To allow the preloading to be run independently of the main audio bring
up it makes sense, and is generally just cleaner, for the preloader
widget to shutdown those things it initialised. This patch moves the
appropriate parts of the shutdown process into the preloader widget.
Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
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Between when we load the DSP and when it actually starts running put the
core into a lower power state where the memory is retained but nothing
is clocked.
Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
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Replace the 1ms msleep in wm_adsp2_ena with a usleep_range, as per
normal guidance on delay functions. Also tighten up the delay a little
as 1ms was quite generous.
Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
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During updating btree, we could push items between sibling
nodes/leaves, for leaves data sections starts reversely from
the end of the block while for nodes we only have key pairs
which are stored one by one from the start of the block.
So we could do try to push key pairs from one node to the next
node right in the tree, and after that, we update the node's
nritems to reflect the correct end while leaving the stale
content in the node. One may intentionally corrupt the fs
image and access the stale content by bumping the nritems and
causes various crashes.
This takes the in-memory @nritems as the correct one and
gets to memset the unused part of a btree node.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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The audio component framework code has not yet landed in the i915 driver
so drop the use of the API for the time being.
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: Jeeja KP <jeeja.kp@intel.com>
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When relocating tree blocks, we firstly get block information from
back references in the extent tree, we then search fs tree to try to
find all parents of a block.
However, if fs tree is corrupted, eg. if there're some missing
items, we could come across these WARN_ONs and BUG_ONs.
This makes us print some error messages and return gracefully
from balance.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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No reason to bug on in here, fs corruption could easily cause these things to
happen.
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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Nobody uses this, it makes no sense to do partial reads of extent buffers.
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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We have a lot of random ints in btrfs_fs_info that can be put into flags. This
is mostly equivalent with the exception of how we deal with quota going on or
off, now instead we set a flag when we are turning it on or off and deal with
that appropriately, rather than just having a pending state that the current
quota_enabled gets set to. Thanks,
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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dedupe and subpage size patchset
Extend btrfs_set_extent_delalloc() and extent_clear_unlock_delalloc()
parameters for both in-band dedupe and subpage sector size patchset.
This should reduce conflict of both patchset and the effort to rebase
them.
Cc: Chandan Rajendra <chandan@linux.vnet.ibm.com>
Cc: David Sterba <dsterba@suse.cz>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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We can re-use the dynamic debugging descriptor to make use of the dynamic
debugging mechanism but still use our own printk interface.
Defining the DEBUG macro works as it did before. When it's defined,
all of the messages default to print. We can also enable all debug
messages at boot or module-load time using the 'dyndbg' and
'btrfs.dyndbg' options.
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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Variable 'gen' in reada_for_search() is not used since commit 58dc4ce43251
("btrfs: remove unused parameter from readahead_tree_block"). This patch
simply removes this variable.
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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Variable 'blocksize' in reada_walk_down() is not used since commit
d3e46fea1b1e ("btrfs: sink blocksize parameter to readahead_tree_block").
This patch simply removes this variable.
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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Currently, btrfs_relocate_chunk() is removing relocated BG by itself. But
the work can be done by btrfs_delete_unused_bgs() (and it's better since it
trim the BG). Let's dedupe the code.
While btrfs_delete_unused_bgs() is already hitting the relocated BG, it
skip the BG since the BG has "ro" flag set (to keep balancing BG intact).
On the other hand, btrfs cannot drop "ro" flag here to prevent additional
writes. So this patch make use of "removed" flag.
btrfs_delete_unused_bgs() now detect the flag to distinguish whether a
read-only BG is relocating or not.
Signed-off-by: Naohiro Aota <naohiro.aota@hgst.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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Currently we allow inconsistence about mixed flag
(BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA).
We'd get ENOSPC if block group has mixed flag and btrfs doesn't.
If that happens, we have one space_info with mixed flag and another
space_info only with BTRFS_BLOCK_GROUP_METADATA, and
global_block_rsv.space_info points to the latter one, but all bytes
from block_group contributes to the mixed space_info, thus all the
allocation will fail with ENOSPC.
This adds a check for the above case.
Reported-by: Vegard Nossum <vegard.nossum@oracle.com>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
[ updated message ]
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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So we can read a btree block via readahead or intentional read,
and we can end up with a memory leak when something happens as
follows,
1) readahead starts to read block A but does not wait for read
completion,
2) btree_readpage_end_io_hook finds that block A is corrupted,
and it needs to clear all block A's pages' uptodate bit.
3) meanwhile an intentional read kicks in and checks block A's
pages' uptodate to decide which page needs to be read.
4) when some pages have the uptodate bit during 3)'s check so
3) doesn't count them for eb->io_pages, but they are later
cleared by 2) so we has to readpage on the page, we get
the wrong eb->io_pages which results in a memory leak of
this block.
This fixes the problem by firstly getting all pages's locking and
then checking pages' uptodate bit.
t1(readahead) t2(readahead endio) t3(the following read)
read_extent_buffer_pages end_bio_extent_readpage
for pg in eb: for page 0,1,2 in eb:
if pg is uptodate: btree_readpage_end_io_hook(pg)
num_reads++ if uptodate:
eb->io_pages = num_reads SetPageUptodate(pg) _______________
for pg in eb: for page 3 in eb: read_extent_buffer_pages
if pg is NOT uptodate: btree_readpage_end_io_hook(pg) for pg in eb:
__extent_read_full_page(pg) sanity check reports something wrong if pg is uptodate:
clear_extent_buffer_uptodate(eb) num_reads++
for pg in eb: eb->io_pages = num_reads
ClearPageUptodate(page) _______________
for pg in eb:
if pg is NOT uptodate:
__extent_read_full_page(pg)
So t3's eb->io_pages is not consistent with the number of pages it's reading,
and during endio(), atomic_dec_and_test(&eb->io_pages) will get a negative
number so that we're not able to free the eb.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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This BUG() has been triggered by a fuzz testing image, which contains
an invalid chunk type, ie. a single stripe chunk has the raid6 type.
Btrfs can handle this gracefully by returning -EIO, so besides using
btrfs_warn to give us more debugging information rather than a single
BUG(), we can return error properly.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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Only in the case of different root_id or different object_id, check_shared
identified extent as the shared. However, If a extent was referred by
different offset of same file, it should also be identified as shared.
In addition, check_shared's loop scale is at least n^3, so if a extent
has too many references, even causes soft hang up.
First, add all delayed_ref to the ref_tree and calculate the unqiue_refs,
if the unique_refs is greater than one, return BACKREF_FOUND_SHARED.
Then individually add the on-disk reference(inline/keyed) to the ref_tree
and calculate the unique_refs of the ref_tree to check if the unique_refs
is greater than one.Because once there are two references to return
SHARED, so the time complexity is close to the constant.
Reported-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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btrfs provides a helpful demonstration of how to export
a global variable via debugfs; however, it is unique among
other debugfs files in that it is world-writable, which causes
some concern to people who are not familiar with its purpose.
Fix it so that it is only user-writable.
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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While processing delayed refs, we may update block group's statistics
and attach it to cur_trans->dirty_bgs, and later writing dirty block
groups will process the list, which happens during
btrfs_commit_transaction().
For whatever reason, the transaction is aborted and dirty_bgs
is not processed in cleanup_transaction(), we end up with memory leak
of these dirty block group cache.
Since btrfs_start_dirty_block_groups() doesn't make it go to the commit
critical section, this also adds the cleanup work inside it.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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Three files are modified, the driver, header file and the binding document.
Updates for the regulator source file include and .of_match_table entry
and node match checking in the probe() function for a compatible pv88080
silicon type. A new "HVBUCK" is added in source file and added
regsiter definition in header file for pv88080 bb silicion.
The binding documentation changes have been made to reflect these updates.
Signed-off-by: Eric Jeong <eric.jeong.opensource@diasemi.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
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Previously device used to start using IGTK key as Tx key as soon as it
gets downloaded in add_key(). This patch implements set_default_mgmt_key
handler. We will update Tx key ID in set_default_mgmt_key().
Signed-off-by: Ganapathi Bhat <gbhat@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
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Use the wl18xx specific config firmware we now have available.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
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Booting multiple wl12xx and wl18xx devices using the same rootfs is
a pain. You currently have to symlink the right nvs file depending
on the wl12xx type.
For example, with wl1271-nvs.bin being a symlink to wl127x-nvs.bin
by default and trying to bring up a wl128x based device:
wlcore: ERROR nvs size is not as expected: 1113 != 912
wlcore: ERROR NVS file is needed during boot
wlcore: ERROR NVS file is needed during boot
wlcore: ERROR firmware boot failed despite 3 retries
Note that wl18xx uses a separate config firmware wl18xx-conf.bin
that can be generated with tools using the following two git repos:
git.ti.com/wilink8-wlan/18xx-ti-utils
git.ti.com/wilink8-wlan/wl18xx_fw
So let's not configure the nvs file for wl18xx as it's not needed
AFAIK. If it turns out that we also need the nvs file for wl18xx,
we can just add it to the config firmware data for wl18xx.
Let's fix the issue by using the chip specific config firmware
data, and make sure we produce understandable warnings if something
is missing.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
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Configure the config firmware names and make it available
in platform data.
Let's also fix the order of the struct wilink_family_data
while at it.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
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Configure the config firmware names and make it available
in platform data.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
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Move struct wilink_family_data to be available for all TI WLAN
variants. And fix familiy typo, it should be just family.
Looks like wl12xx use two different nvs.bin files and wl18xx
uses a different conf.bin file.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
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If the DASD device gets blocked for any reason, e.g. because it is reserved
somewhere, the host_access_count sysfs entry or the host_access_list
debugfs entry may sleep forever. Make it interruptible so that userspace
can use ^C to abort the operation.
Signed-off-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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A DASD device consists of the device itself and a discipline with a
corresponding private structure. These fields are set up during online
processing right after the device is created and before it is processed by
the state machine and made available for I/O.
During offline processing the discipline pointer and the private data gets
freed within the state machine and without protection of the existing
reference count. This might lead to a kernel panic because a function might
have taken a device reference and accesses the discipline pointer and/or
private data of the device while this is already freed.
Fix by freeing the discipline pointer and the private data after ensuring
that there is no reference to the device left.
Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Internal I/O is processed by the _sleep_on_function which might wait for a
device to get operational. During offline processing this will never happen
and therefore the refcount of the device will not drop to zero and the
offline processing blocks as well.
Fix by letting requests fail in the _sleep_on function during offline
processing. No further handling of the requests is necessary since this is
internal I/O and the device is thrown away afterwards.
Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Jason Baron says:
====================
bnx2x: page allocation failure
While configuring ~500 multicast addrs, we ran into high order
page allocation failures. They don't need to be high order, and
thus I'm proposing to split them into at most PAGE_SIZE allocations.
Below is a sample failure.
[1201902.617882] bnx2x: [bnx2x_set_mc_list:12374(eth0)]Failed to create multicast MACs list: -12
[1207325.695021] kworker/1:0: page allocation failure: order:2, mode:0xc020
[1207325.702059] CPU: 1 PID: 15805 Comm: kworker/1:0 Tainted: G W
[1207325.712940] Hardware name: SYNNEX CORPORATION 1x8-X4i SSD 10GE/S5512LE, BIOS V8.810 05/16/2013
[1207325.722284] Workqueue: events bnx2x_sp_rtnl_task [bnx2x]
[1207325.728206] 0000000000000000 ffff88012d873a78 ffffffff8267f7c7 000000000000c020
[1207325.736754] 0000000000000000 ffff88012d873b08 ffffffff8212f8e0 fffffffc00000003
[1207325.745301] ffff88041ffecd80 ffff880400000030 0000000000000002 0000c0206800da13
[1207325.753846] Call Trace:
[1207325.756789] [<ffffffff8267f7c7>] dump_stack+0x4d/0x63
[1207325.762426] [<ffffffff8212f8e0>] warn_alloc_failed+0xe0/0x130
[1207325.768756] [<ffffffff8213c898>] ? wakeup_kswapd+0x48/0x140
[1207325.774914] [<ffffffff82132afc>] __alloc_pages_nodemask+0x2bc/0x970
[1207325.781761] [<ffffffff82173691>] alloc_pages_current+0x91/0x100
[1207325.788260] [<ffffffff8212fa1e>] alloc_kmem_pages+0xe/0x10
[1207325.794329] [<ffffffff8214c9c8>] kmalloc_order+0x18/0x50
[1207325.800227] [<ffffffff8214ca26>] kmalloc_order_trace+0x26/0xb0
[1207325.806642] [<ffffffff82451c68>] ? _xfer_secondary_pool+0xa8/0x1a0
[1207325.813404] [<ffffffff8217cfda>] __kmalloc+0x19a/0x1b0
[1207325.819142] [<ffffffffa02fe975>] bnx2x_set_rx_mode_inner+0x3d5/0x590 [bnx2x]
[1207325.827000] [<ffffffffa02ff52d>] bnx2x_sp_rtnl_task+0x28d/0x760 [bnx2x]
[1207325.834197] [<ffffffff820695d4>] process_one_work+0x134/0x3c0
[1207325.840522] [<ffffffff82069981>] worker_thread+0x121/0x460
[1207325.846585] [<ffffffff82069860>] ? process_one_work+0x3c0/0x3c0
[1207325.853089] [<ffffffff8206f039>] kthread+0xc9/0xe0
[1207325.858459] [<ffffffff82070000>] ? notify_die+0x10/0x40
[1207325.864263] [<ffffffff8206ef70>] ? kthread_create_on_node+0x180/0x180
[1207325.871288] [<ffffffff826852d2>] ret_from_fork+0x42/0x70
[1207325.877183] [<ffffffff8206ef70>] ? kthread_create_on_node+0x180/0x180
v2:
-make use of list_next_entry()
-only use PAGE_SIZE allocations
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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Currently, we can have high order page allocations that specify
GFP_ATOMIC when configuring multicast MAC address filters.
For example, we have seen order 2 page allocation failures with
~500 multicast addresses configured.
Convert the allocation for the pending list to be done in PAGE_SIZE
increments.
Signed-off-by: Jason Baron <jbaron@akamai.com>
Cc: Yuval Mintz <Yuval.Mintz@qlogic.com>
Cc: Ariel Elior <Ariel.Elior@qlogic.com>
Acked-by: Yuval Mintz <Yuval.Mintz@caviumnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Currently, we can have high order page allocations that specify
GFP_ATOMIC when configuring multicast MAC address filters.
For example, we have seen order 2 page allocation failures with
~500 multicast addresses configured.
Convert the allocation for 'mcast_list' to be done in PAGE_SIZE
increments.
Signed-off-by: Jason Baron <jbaron@akamai.com>
Cc: Yuval Mintz <Yuval.Mintz@qlogic.com>
Cc: Ariel Elior <Ariel.Elior@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: Simon Wood <simon@mungewell.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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Move ForceFeedback support for the Formula Force GP into hid-lgff4
and re-write HID descriptor, thus allowing combined pedals or not
as user desires.
Signed-off-by: Simon Wood <simon@mungewell.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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Rewrite the HID descriptor for _all_ Driving Force wheels (real
or emulated) so that they can report separate Accelerator and
Brake axis.
If the user wants a combined accel/brake axis, they can use the
'combined pedals' feature.
$ echo 1 > /sys/bus/hid/devices/<device-id>/combine_pedals
Signed-off-by: Simon Wood <simon@mungewell.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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Add support for computing a combined accelerator/brake axis for wheels
which don't contain combined data in their HID stream.
This includes DFGT, G25, G27, G29 and Wii-Wheel.
Signed-off-by: Simon Wood <simon@mungewell.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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Add support for reporting a combined accelerator/brake axis for wheels
which contain combined data in their HID stream.
This includes DF, MOMO, MOMO2 and DFP.
Signed-off-by: Simon Wood <simon@mungewell.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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Introduce a dev_attr which can be used to combine the accelerator
and brake pedals into a single axis. This is useful for older games
which can not handle seperate accelerator and brake.
Signed-off-by: Simon Wood <simon@mungewell.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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