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2012-07-19staging: comedi: adv_pci1710: factor out the "find pci device" codeH Hartley Sweeten
Factor the "find pci device" code out of the attach function. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Cc: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-19staging: comedi: adv_pci1723: store the pci_dev in the comedi_deviceH Hartley Sweeten
Use the hw_dev pointer in the comedi_device struct to hold the pci_dev instead of carrying it in the private data. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Cc: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-19staging: comedi: adv_pci1723: move comedi_pci_enable() into the attachH Hartley Sweeten
Use pci_is_enabled() in the "find pci device" function to determine if the found pci device is not in use and move the comedi_pci_enable() call into the attach. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Cc: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-19staging: comedi: adv_pci1723: cleanup "find pci device" codeH Hartley Sweeten
Use for_each_pci_dev() instead of open-coding the loop using pci_get_device(). Drop the printk error messages. They just add noise. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Cc: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-19staging: comedi: adv_pci1723: factor out the "find pci device" codeH Hartley Sweeten
Factor the "find pci device" code out of the attach function. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Cc: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-19staging: comedi: adl_pci9118: store the pci_dev in the comedi_deviceH Hartley Sweeten
Use the hw_dev pointer in the comedi_device struct to hold the pci_dev instead of carrying it in the private data. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Cc: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-19staging: comedi: adl_pci9111: store the pci_dev in the comedi_deviceH Hartley Sweeten
Use the hw_dev pointer in the comedi_device struct to hold the pci_dev instead of carrying it in the private data. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Cc: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-19staging: comedi: adl_pci8164: remove the private dataH Hartley Sweeten
The private data is no longer needed by this driver. Remove the struct, devpriv macro, and the allocation. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Cc: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-19staging: comedi: adl_pci8164: store the pci_dev in the comedi_deviceH Hartley Sweeten
Use the hw_dev pointer in the comedi_device struct to hold the pci_dev instead of carrying it in the private data. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Cc: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-19staging: comedi: adl_pci7432: remove the private dataH Hartley Sweeten
The private data is no longer needed by this driver. Remove the struct, devpriv macro, and the allocation. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Cc: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-19staging: comedi: adl_pci7432: store the pci_dev in the comedi_deviceH Hartley Sweeten
Use the hw_dev pointer in the comedi_device struct to hold the pci_dev instead of carrying it in the private data. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Cc: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-19staging: comedi: adl_pci7296: remove the private dataH Hartley Sweeten
The private data is no longer needed by this driver. Remove the struct, devpriv macro, and the allocation. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Cc: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-19staging: comedi: adl_pci7296: store the pci_dev in the comedi_deviceH Hartley Sweeten
Use the hw_dev pointer in the comedi_device struct to hold the pci_dev instead of carrying it in the private data. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Cc: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-19staging: comedi: adl_pci7230: remove the private dataH Hartley Sweeten
The private data is no longer needed by this driver. Remove the struct, devpriv macro, and the allocation. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Cc: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-19staging: comedi: adl_pci7230: store the pci_dev in the comedi_deviceH Hartley Sweeten
Use the hw_dev pointer in the comedi_device struct to hold the pci_dev instead of carrying it in the private data. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Cc: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-19staging: comedi: adl_pci6208: store the pci_dev in the comedi_deviceH Hartley Sweeten
Use the hw_dev pointer in the comedi_device struct to hold the pci_dev instead of carrying it in the private data. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Cc: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-19staging: comedi: comedidev.h: introduce comedi_to_pci_dev() helperH Hartley Sweeten
Introduce a wrapper for to_pci_dev() to allow the comedi_pci_drivers to store the pci_dev pointer in the comedi_device hw_dev variable and retrieve it easily. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Cc: Ian Abbot <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-19Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client Pull last minute Ceph fixes from Sage Weil: "The important one fixes a bug in the socket failure handling behavior that was turned up in some recent failure injection testing. The other two are minor bug fixes." * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client: rbd: endian bug in rbd_req_cb() rbd: Fix ceph_snap_context size calculation libceph: fix messenger retry
2012-07-19staging/cptm1217: fix checkpatch warningsToshiaki Yamane
The below checkpatch error was fixed, drivers/staging/cptm1217/cp_tm1217.h:5: ERROR: open brace '{' following struct go on the same line Signed-off-by: Toshiaki Yamane <yamanetoshi@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-19staging: csr: remove unneeded PCI dependencyLauri Hintsala
Signed-off-by: Lauri Hintsala <lauri.hintsala@bluegiga.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-19staging/frontier: fix checkpatch warningsToshiaki Yamane
The below checkpatch warns was fixed, drivers/staging/frontier/tranzport.c:356: WARNING: Prefer pr_err(... to printk(KERN_ERR, ... drivers/staging/frontier/tranzport.c:523: WARNING: Prefer pr_err(... to printk(KERN_ERR, ... drivers/staging/frontier/tranzport.c:696: WARNING: Prefer pr_err(... to printk(KERN_ERR, ... drivers/staging/frontier/alphatrack.c:336: WARNING: Prefer pr_err(... to printk(KERN_ERR, ... drivers/staging/frontier/alphatrack.c:497: WARNING: Prefer pr_err(... to printk(KERN_ERR, ... drivers/staging/frontier/alphatrack.c:568: WARNING: Prefer pr_err(... to printk(KERN_ERR, ... Signed-off-by: Toshiaki Yamane <yamanetoshi@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-19staging/et131x: fix checkpatch warningsToshiaki Yamane
The below checkpatch warns was fixed, drivers/staging/et131x/et131x.c:2556: WARNING: Prefer pr_info(... to printk(KERN_INFO, ... drivers/staging/et131x/et131x.c:2577: WARNING: Prefer pr_info(... to printk(KERN_INFO, ... drivers/staging/et131x/et131x.c:5189: WARNING: Prefer pr_info(... to printk(KERN_INFO, ... And fixed below, -added pr_fmt -fixed printk formats for dma_addr_t -converted printk to netdev_info Signed-off-by: Toshiaki Yamane <yamanetoshi@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-19staging: sbe-2t3e3: Remove code that will never executeMarcos Paulo de Souza
This patch removes all references of "if 0" blocks in the sbe-2t3e3 driver. Signed-off-by: Marcos Paulo de Souza <marcos.souza.org@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-19mm: frontswap: split out function to clear a page outSasha Levin
Signed-off-by: Sasha Levin <levinsasha928@gmail.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-07-19usb: Add USB_QUIRK_RESET_RESUME for all Logitech UVC webcamsLaurent Pinchart
Most Logitech UVC webcams (both early models that don't advertise UVC compatibility and newer UVC-advertised devices) require the RESET_RESUME quirk. Instead of listing each and every model, match the devices based on the UVC interface information. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-19usb: Add quirk detection based on interface informationLaurent Pinchart
When a whole class of devices (possibly from a specific vendor, or across multiple vendors) require a quirk, explictly listing all devices in the class make the quirks table unnecessarily large. Fix this by allowing matching devices based on interface information. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-19vme_user.c: remove duplicated includeDuan Jiong
Signed-off-by: Duan Jiong <djduanjiong@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-19VME: Prevent D16 cycles being split into 8-bit blocksMartyn Welch
The memcpy_fromio() and memcpy_toio() functions use the __memcpy() function, at least on x86. This function carries out transfers smaller than 32 bits as multiple 8 bit transfers, causing a single (aligned) 16 bit transfer to be split into 2 8 bit transfers which may not be supported by the target VME device. The commit 53059aa05988761a738fa8bc082bbf3c5d4462d1 fixed this for the ca91cx42, however this was not fixed for the tsi148 at the time. This patch uses the same algorithm to fix the tsi148. Reported-by: Daniel Lambert <daniel.lambert@clermont.in2p3.fr> Signed-off-by: Martyn Welch <martyn.welch@ge.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-19staging: sm7xxfb: fix for "rename smtc_screen_info to smtc_scr_info"Stephen Rothwell
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Acked-by: Javier Muñoz <jmunhoz@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-19mei: use module_pci_driverTomas Winkler
use module_pci_driver() macro to wrap standard pci module registration into a single line Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-19Drivers: hv: Change the hex constant to a decimal constantK. Y. Srinivasan
The hex constant chosen for HV_LINUX_GUEST_ID_HI was offensive, update to use the decimal equivalent instead. Reported-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Acked-by: Jeff Garzik <jgarzik@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-19clk: fix compile for OF && !COMMON_CLKRob Herring
With commit 766e6a4ec602d0c107 (clk: add DT clock binding support), compiling with OF && !COMMON_CLK is broken. Reported-by: Alexandre Pereira da Silva <aletes.xgr@gmail.com> Reported-by: Prashant Gaikwad <pgaikwad@nvidia.com> Signed-off-by: Rob Herring <rob.herring@calxeda.com> Signed-off-by: Mike Turquette <mturquette@linaro.org>
2012-07-19clk: fix clk_get on of_clk_get_by_name return checkShawn Guo
The commit 766e6a4 (clk: add DT clock binding support) plugs device tree clk lookup of_clk_get_by_name into clk_get, and fall on non-DT lookup clk_get_sys if DT lookup fails. The return check on of_clk_get_by_name takes (clk != NULL) as a successful DT lookup. But it's not the case. For any system that does not define clk lookup in device tree, ERR_PTR(-ENOENT) will be returned, and consequently, all the client drivers calling clk_get in their probe functions will fail to probe with error code -ENOENT returned. Fix the issue by checking of_clk_get_by_name return with !IS_ERR(clk), and update of_clk_get and of_clk_get_by_name for !CONFIG_OF build correspondingly. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Acked-by: Rob Herring <rob.herring@calxeda.com> Tested-by: Marek Vasut <marex@denx.de> Tested-by: Lauri Hintsala <lauri.hintsala@bluegiga.com> Signed-off-by: Mike Turquette <mturquette@linaro.org>
2012-07-19Merge branch 'net' of ↵David S. Miller
git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile
2012-07-19ipv4: Fix again the time difference calculationJulian Anastasov
Fix again the diff value in rt_bind_exception after collision of two latest patches, my original commit actually fixed the same problem. Signed-off-by: Julian Anastasov <ja@ssi.bg> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-19xen: populate correct number of pages when across mem boundary (v2)zhenzhong.duan
When populate pages across a mem boundary at bootup, the page count populated isn't correct. This is due to mem populated to non-mem region and ignored. Pfn range is also wrongly aligned when mem boundary isn't page aligned. For a dom0 booted with dom_mem=3368952K(0xcd9ff000-4k) dmesg diff is: [ 0.000000] Freeing 9e-100 pfn range: 98 pages freed [ 0.000000] 1-1 mapping on 9e->100 [ 0.000000] 1-1 mapping on cd9ff->100000 [ 0.000000] Released 98 pages of unused memory [ 0.000000] Set 206435 page(s) to 1-1 mapping -[ 0.000000] Populating cd9fe-cda00 pfn range: 1 pages added +[ 0.000000] Populating cd9fe-cd9ff pfn range: 1 pages added +[ 0.000000] Populating 100000-100061 pfn range: 97 pages added [ 0.000000] BIOS-provided physical RAM map: [ 0.000000] Xen: 0000000000000000 - 000000000009e000 (usable) [ 0.000000] Xen: 00000000000a0000 - 0000000000100000 (reserved) [ 0.000000] Xen: 0000000000100000 - 00000000cd9ff000 (usable) [ 0.000000] Xen: 00000000cd9ffc00 - 00000000cda53c00 (ACPI NVS) ... [ 0.000000] Xen: 0000000100000000 - 0000000100061000 (usable) [ 0.000000] Xen: 0000000100061000 - 000000012c000000 (unusable) ... [ 0.000000] MEMBLOCK configuration: ... -[ 0.000000] reserved[0x4] [0x000000cd9ff000-0x000000cd9ffbff], 0xc00 bytes -[ 0.000000] reserved[0x5] [0x00000100000000-0x00000100060fff], 0x61000 bytes Related xen memory layout: (XEN) Xen-e820 RAM map: (XEN) 0000000000000000 - 000000000009ec00 (usable) (XEN) 00000000000f0000 - 0000000000100000 (reserved) (XEN) 0000000000100000 - 00000000cd9ffc00 (usable) Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com> [v2: If xen_do_chunk fail(populate), abort this chunk and any others] Suggested by David, thanks. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-07-19xen PVonHVM: move shared_info to MMIO before kexecOlaf Hering
Currently kexec in a PVonHVM guest fails with a triple fault because the new kernel overwrites the shared info page. The exact failure depends on the size of the kernel image. This patch moves the pfn from RAM into MMIO space before the kexec boot. The pfn containing the shared_info is located somewhere in RAM. This will cause trouble if the current kernel is doing a kexec boot into a new kernel. The new kernel (and its startup code) can not know where the pfn is, so it can not reserve the page. The hypervisor will continue to update the pfn, and as a result memory corruption occours in the new kernel. One way to work around this issue is to allocate a page in the xen-platform pci device's BAR memory range. But pci init is done very late and the shared_info page is already in use very early to read the pvclock. So moving the pfn from RAM to MMIO is racy because some code paths on other vcpus could access the pfn during the small window when the old pfn is moved to the new pfn. There is even a small window were the old pfn is not backed by a mfn, and during that time all reads return -1. Because it is not known upfront where the MMIO region is located it can not be used right from the start in xen_hvm_init_shared_info. To minimise trouble the move of the pfn is done shortly before kexec. This does not eliminate the race because all vcpus are still online when the syscore_ops will be called. But hopefully there is no work pending at this point in time. Also the syscore_op is run last which reduces the risk further. Signed-off-by: Olaf Hering <olaf@aepfle.de> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-07-19xen: simplify init_hvm_pv_infoOlaf Hering
init_hvm_pv_info is called only in PVonHVM context, move it into ifdef. init_hvm_pv_info does not fail, make it a void function. remove arguments from init_hvm_pv_info because they are not used by the caller. Signed-off-by: Olaf Hering <olaf@aepfle.de> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-07-19xen: remove cast from HYPERVISOR_shared_info assignmentOlaf Hering
Both have type struct shared_info so no cast is needed. Signed-off-by: Olaf Hering <olaf@aepfle.de> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-07-19xen: enable platform-pci only in a Xen guestOlaf Hering
While debugging kexec issues in a PVonHVM guest I modified xen_hvm_platform() to return false to disable all PV drivers. This caused a crash in platform_pci_init() because it expects certain data structures to be initialized properly. To avoid such a crash make sure the driver is initialized only if running in a Xen guest. Signed-off-by: Olaf Hering <olaf@aepfle.de> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-07-19xen/pv-on-hvm kexec: shutdown watches from old kernelOlaf Hering
Add xs_reset_watches function to shutdown watches from old kernel after kexec boot. The old kernel does not unregister all watches in the shutdown path. They are still active, the double registration can not be detected by the new kernel. When the watches fire, unexpected events will arrive and the xenwatch thread will crash (jumps to NULL). An orderly reboot of a hvm guest will destroy the entire guest with all its resources (including the watches) before it is rebuilt from scratch, so the missing unregister is not an issue in that case. With this change the xenstored is instructed to wipe all active watches for the guest. However, a patch for xenstored is required so that it accepts the XS_RESET_WATCHES request from a client (see changeset 23839:42a45baf037d in xen-unstable.hg). Without the patch for xenstored the registration of watches will fail and some features of a PVonHVM guest are not available. The guest is still able to boot, but repeated kexec boots will fail. Signed-off-by: Olaf Hering <olaf@aepfle.de> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-07-19xen/x86: avoid updating TLS descriptors if they haven't changedDavid Vrabel
When switching tasks in a Xen PV guest, avoid updating the TLS descriptors if they haven't changed. This improves the speed of context switches by almost 10% as much of the time the descriptors are the same or only one is different. The descriptors written into the GDT by Xen are modified from the values passed in the update_descriptor hypercall so we keep shadow copies of the three TLS descriptors to compare against. lmbench3 test Before After Improvement -------------------------------------------- lat_ctx -s 32 24 7.19 6.52 9% lat_pipe 12.56 11.66 7% Signed-off-by: David Vrabel <david.vrabel@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-07-19xen/x86: add desc_equal() to compare GDT descriptorsDavid Vrabel
Signed-off-by: David Vrabel <david.vrabel@citrix.com> [v1: Moving it to the Xen file] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-07-19xen/mm: zero PTEs for non-present MFNs in the initial page tableDavid Vrabel
When constructing the initial page tables, if the MFN for a usable PFN is missing in the p2m then that frame is initially ballooned out. In this case, zero the PTE (as in decrease_reservation() in drivers/xen/balloon.c). This is obviously safe instead of having an valid PTE with an MFN of INVALID_P2M_ENTRY (~0). Signed-off-by: David Vrabel <david.vrabel@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-07-19xen/mm: do direct hypercall in xen_set_pte() if batching is unavailableDavid Vrabel
In xen_set_pte() if batching is unavailable (because the caller is in an interrupt context such as handling a page fault) it would fall back to using native_set_pte() and trapping and emulating the PTE write. On 32-bit guests this requires two traps for each PTE write (one for each dword of the PTE). Instead, do one mmu_update hypercall directly. During construction of the initial page tables, continue to use native_set_pte() because most of the PTEs being set are in writable and unpinned pages (see phys_pmd_init() in arch/x86/mm/init_64.c) and using a hypercall for this is very expensive. This significantly improves page fault performance in 32-bit PV guests. lmbench3 test Before After Improvement ---------------------------------------------- lat_pagefault 3.18 us 2.32 us 27% lat_proc fork 356 us 313.3 us 11% Signed-off-by: David Vrabel <david.vrabel@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-07-19xen/hvc: Fix up checks when the info is allocated.Konrad Rzeszutek Wilk
Coverity would complain about this - even thought it looks OK. CID 401957 Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-07-19xen/acpi: Fix potential memory leak.Konrad Rzeszutek Wilk
Coverity points out that we do not free in one case the pr_backup - and sure enough we forgot. Found by Coverity (CID 401970) Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-07-19xen/mce: add .poll method for mcelog device driverLiu, Jinsong
If a driver leaves its poll method NULL, the device is assumed to be both readable and writable without blocking. This patch add .poll method to xen mcelog device driver, so that when mcelog use system calls like ppoll or select, it would be blocked when no data available, and avoid spinning at CPU. Reported-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Liu, Jinsong <jinsong.liu@intel.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-07-19xen/mce: schedule a workqueue to avoid sleep in atomic contextLiu, Jinsong
copy_to_user might sleep and print a stack trace if it is executed in an atomic spinlock context. Like this: (XEN) CMCI: send CMCI to DOM0 through virq BUG: sleeping function called from invalid context at /home/konradinux/kernel.h:199 in_atomic(): 1, irqs_disabled(): 0, pid: 4581, name: mcelog Pid: 4581, comm: mcelog Tainted: G O 3.5.0-rc1upstream-00003-g149000b-dirty #1 [<ffffffff8109ad9a>] __might_sleep+0xda/0x100 [<ffffffff81329b0b>] xen_mce_chrdev_read+0xab/0x140 [<ffffffff81148945>] vfs_read+0xc5/0x190 [<ffffffff81148b0c>] sys_read+0x4c/0x90 [<ffffffff815bd039>] system_call_fastpath+0x16 This patch schedule a workqueue for IRQ handler to poll the data, and use mutex instead of spinlock, so copy_to_user sleep in atomic context would not occur. Reported-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Suggested-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Liu, Jinsong <jinsong.liu@intel.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2012-07-19xen/pcpu: Xen physical cpus online/offline sys interfaceLiu, Jinsong
This patch provide Xen physical cpus online/offline sys interface. User can use it for their own purpose, like power saving: by offlining some cpus when light workload it save power greatly. Its basic workflow is, user online/offline cpu via sys interface, then hypercall xen to implement, after done xen inject virq back to dom0, and then dom0 sync cpu status. Signed-off-by: Jiang, Yunhong <yunhong.jiang@intel.com> Signed-off-by: Liu, Jinsong <jinsong.liu@intel.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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