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2013-06-10usb: gadget: f_ncm: use usb_gstrings_attachAndrzej Pietrasiewicz
Trivial patch making use of the new usb_gstrings_attach interface. Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-06-10usb: gadget: f_ncm: remove compatibility layerAndrzej Pietrasiewicz
There are no old function interface users left, so the old interface can be removed. Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-06-10usb: gadget: ncm: convert to new function interfaceAndrzej Pietrasiewicz
Utilize our new configfs-based interface. Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-06-10usb: gadget: f_ncm: convert to new function interface with backward ↵Andrzej Pietrasiewicz
compatibility Converting ncm to the new function interface requires converting the USB ncm's function code and its users. This patch converts the f_ncm.c to the new function interface. The file is now compiled into a separate usb_f_ncm.ko module. The old function interface is provided by means of a preprocessor conditional directives. After all users are converted, the old interface can be removed. Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-06-10usb: gadget: u_ether: construct with default values and add setters/gettersAndrzej Pietrasiewicz
Add an interface to create a struct netdev_dev filled with default values, an interface which makes it an interface to fill the struct with useful values and an interface to read the values set. The patch also adds an interface to register the net device associated with an ethernet-over-usb link. Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-06-10usb: gadget: rndis: convert into moduleAndrzej Pietrasiewicz
In order to convert to configfs the usb functions need to be converted to a new interface and compiled as modules. This patch creates an rndis module which will be used by the new functions. After all users of f_rndis are converted to the new interface, this module can be merged with f_rndis module. Acked-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-06-10usb: gadget: u_ether: convert into moduleAndrzej Pietrasiewicz
u_ether.c has been #include'd by all gadgets which implement USB Ethernet functions. In order to add configfs support, the f_ecm.c, f_eem.c, f_ncm.c, f_subset.c, f_rndis.c need to be converted into modules and must not be #include'd. Consequently, the u_ether.c needs to be a module too, in a manner similar to u_serial.c. The resulting module should not take any parameters, so they are pushed to the current users of it, that is ether.c, g_ffs.c, multi.c, ncm.c, nokia.c. Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-06-10usb: gadget: f_mass_storage: add missing memory barrier for thread_wakeup_neededUCHINO Satoshi
Without this memory barrier, the file-storage thread may fail to escape from the following while loop, because it may observe new common->thread_wakeup_needed and old bh->state which are updated by the callback functions. /* Wait for the CBW to arrive */ while (bh->state != BUF_STATE_FULL) { rc = sleep_thread(common); if (rc) return rc; } Cc: stable@vger.kernel.org Signed-off-by: UCHINO Satoshi <satoshi.uchino@toshiba.co.jp> Acked-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-06-10USB: gadget: f_uac2: Fix broken prm to uac2 mappingJassi Brar
prm_to_uac2() is broken because it tests against pointer it itself mapped onto, which will never be different. Fix the mapping by adding pointer to parent chip in each rtd param and removing the prm_to_uac2(). Reported-by: Julien Rouviere <jrouviere@qualistream.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-06-10usb: gadget: r8a66597-udc: do not unlock unheld spinlock in ↵Alexey Khoroshilov
r8a66597_sudmac_irq() r8a66597_irq() processes sudmac part (r8a66597_sudmac_irq()) before locking r8a66597->lock. But transfer_complete(), that is called inside (r8a66597_sudmac_irq()->sudmac_finish()->transfer_complete()), expects r8a66597->lock is locked. As a result unheld spinlock can be unlocked. The patch just moves locking before calling r8a66597_sudmac_irq(). Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-06-10s390/pci: Implement IRQ functions if !PCIBen Hutchings
All architectures must implement IRQ functions. Since various dependencies on !S390 were removed, there are various drivers that can be selected but will fail to link. Provide a dummy implementation of these functions for the !PCI case. Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Cc: stable@vger.kernel.org # 3.9 Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2013-06-10ipvs: info leak in __ip_vs_get_dest_entries()Dan Carpenter
The entry struct has a 2 byte hole after ->port and another 4 byte hole after ->stats.outpkts. You must have CAP_NET_ADMIN in your namespace to hit this information leak. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Julian Anastasov <ja@ssi.bg> Signed-off-by: Simon Horman <horms@verge.net.au> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2013-06-10ACPI / video: Do not bind to device objects with a scan handlerRafael J. Wysocki
With the introduction of ACPI scan handlers, ACPI device objects with an ACPI scan handler attached to them must not be bound to by ACPI drivers any more. Unfortunately, however, the ACPI video driver attempts to do just that if there is a _ROM ACPI control method defined under a device object with an ACPI scan handler. Prevent that from happening by making the video driver's "add" routine check if the device object already has an ACPI scan handler attached to it and return an error code in that case. That is not sufficient, though, because acpi_bus_driver_init() would then clear the device object's driver_data that may be set by its scan handler, so for the fix to work acpi_bus_driver_init() has to be modified to leave driver_data as is on errors. References: https://bugzilla.kernel.org/show_bug.cgi?id=58091 Bisected-and-tested-by: Dmitry S. Demin <dmitryy.demin@gmail.com> Reported-and-tested-by: Jason Cassell <bluesloth600@gmail.com> Tracked-down-by: Aaron Lu <aaron.lu@intel.com> Cc: 3.9+ <stable@kernel.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Aaron Lu <aaron.lu@intel.com>
2013-06-10Merge remote-tracking branch 'asoc/fix/wm8994' into asoc-linusMark Brown
2013-06-10Merge remote-tracking branch 'asoc/fix/tlv320aic3x' into asoc-linusMark Brown
2013-06-10Merge remote-tracking branch 'asoc/fix/maintainers' into asoc-linusMark Brown
2013-06-10Merge remote-tracking branch 'asoc/fix/cs42l52' into asoc-linusMark Brown
2013-06-10Merge remote-tracking branch 'asoc/fix/core' into asoc-linusMark Brown
2013-06-10Merge remote-tracking branch 'asoc/fix/arizona' into asoc-linusMark Brown
2013-06-10ARM: EXYNOS: no more support non-DT for EXYNOS SoCsKukjin Kim
As we discussed in mailing list, non-DT for EXYNOS SoCs will not be supported from v3.11. This patch removes regarding files for non-DT including board files and defconfig. Cc: Sylwester Nawrocki <s.nawrocki@samsung.com> Cc: Tomasz Figa <t.figa@samsung.com> Cc: Thomas Abraham <thomas.ab@samsung.com> Cc: Kyungmin Park <kyungmin.park@samsung.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Olof Johansson <olof@lixom.net> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
2013-06-10ARM: dts: add max77686 node entry for ODROID-XDongjin Kim
ODROID-X board have a max77686 PMIC on i2c channel 0. The properties of used LDO and BUCK are defined according the schematic. Signed-off-by: Dongjin Kim <tobetter@gmail.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
2013-06-10ARM: dts: Enable RTC by default on EXYNOS5440Youngmin Nam
RTC is a basic feature of EXYNOS5440. But it was disabled by issue that comes from EXYNOS5250. (commit id: 522ccdb6) That issue only applies to EXYNOS5250 not EXYNOS5440. So, there is no issue with enabled RTC on EXYNOS5440. This change was tested on EXYNOS5440. Signed-off-by: Youngmin Nam <youngmin.nam@samsung.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
2013-06-10ARM: dts: Add display timing node to exynos5250-arndale.dtsVikas Sajjan
Adds display timing node for a DP panel to Arndale Board DTS file Signed-off-by: Vikas Sajjan <vikas.sajjan@linaro.org> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
2013-06-10ARM: dts: Add clock provider information for DP controller in Exynos5250 SoCVikas Sajjan
Adds clock provider information for DP controller required by CCF. Signed-off-by: Vikas Sajjan <vikas.sajjan@linaro.org> Signed-off-by: Arun Kumar K <arun.kk@samsung.com> Acked-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
2013-06-10ARM: dts: Add DT node for DP controller for Arndale BoardVikas Sajjan
Add DT node for DP controller to exynos5250 based Arndale Board Signed-off-by: Vikas Sajjan <vikas.sajjan@linaro.org> Reviewed-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
2013-06-10ARM: dts: Remove combiner IRQ node from exynos4x12.dtsiSachin Kamat
These nodes have separately been added to 4212 and 4412 dtsi files by commit 30269ddff1 ("ARM: exynos: add missing properties for combiner IRQs"). The existing node also contained a few incorrect entries. Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
2013-06-10ARM: dts: add max8997 device node for exynos4210-origen boardThomas Abraham
Add max8997 regulator device node for exynos4210-origen board and list all the supported regulators. Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org> Tested-by: Tushar Behera <tushar.behera@linaro.org> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
2013-06-10ARM: dts: Enable TMU on Origen4210 boardSachin Kamat
Enables TMU on Origen4210 board. Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
2013-06-10ARM: dts: Add TMU clock entries to exynos4210.dtsiSachin Kamat
Adds TMU clock entries to exynos4210.dtsi file. Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
2013-06-10ARM: dts: Update MFC documentation for clock entriesSachin Kamat
Added clock entry definitions to MFC bindings document. Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
2013-06-10ARM: dts: Add MFC clock entries for exynos4Sachin Kamat
Added MFC related clock entries in exynos4.dtsi file. Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
2013-06-10ARM: dts: Add keypad entries to SMDK4412Sachin Kamat
Added keypad node entries to SMDK4412 board DT file. Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
2013-06-10ARM: dts: Add keypad entries to Exynos4412 based OrigenSachin Kamat
Added keypad node entries to Exynos4412 based Origen board DT file. Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
2013-06-10ARM: dts: Remove keypad entries from exynos4x12-pinctrl.dtsiSachin Kamat
Keypad pins/lines are board specific and should be added to respective board dts files. Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
2013-06-10ARM: dts: Enabling dwc3-exynos driver for exynos5250Vivek Gautam
Adding DWC3 device tree node for Exynos5250 needed to parse device tree data. Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
2013-06-10ARM: dts: Add device tree bindings for dwc3-exynosVivek Gautam
Document device tree binding information as required by the Samsung' USB 3.0 controller. Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
2013-06-10ARM: dts: Enabling samsung-usb3phy driver for exynos5250Vivek Gautam
Adding usb3.0 phy node for Exynos5250 along with the necessary device data to be parsed. Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
2013-06-10drm/i915: prefer VBT modes for SVDO-LVDS over EDIDDaniel Vetter
In commit 53d3b4d7778daf15900867336c85d3f8dd70600c Author: Egbert Eich <eich@suse.de> Date: Tue Jun 4 17:13:21 2013 +0200 drm/i915/sdvo: Use &intel_sdvo->ddc instead of intel_sdvo->i2c for DDC Egbert Eich fixed a long-standing bug where we simply used a non-working i2c controller to read the EDID for SDVO-LVDS panels. Unfortunately some machines seem to not be able to cope with the mode provided in the EDID. Specifically they seem to not be able to cope with a 4x pixel mutliplier instead of a 2x one, which seems to have been worked around by slightly changing the panels native mode in the VBT so that the dotclock is just barely above 50MHz. Since it took forever to notice the breakage it's fairly safe to assume that at least for SDVO-LVDS panels the VBT contains fairly sane data. So just switch around the order and use VBT modes first. v2: Also add EDID modes just in case, and spell Egbert correctly. v3: Elaborate a bit more about what's going on on Chris' machine. Cc: Egbert Eich <eich@suse.de> Cc: Chris Wilson <chris@chris-wilson.co.uk> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=65524 Cc: stable@vger.kernel.org Reported-and-tested-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2013-06-10drm/i915: Enable hotplug interrupts after querying hw capabilities.Chris Wilson
sdvo->hotplug_active is initialised during intel_sdvo_setup_outputs(), and so we never enabled the hotplug interrupts on SDVO as we were checking too early. This regression has been introduced somewhere in the hpd rework for the storm detection and handling starting with commit 1d843f9de4e6dc6a899b6f07f106c00da09925e6 Author: Egbert Eich <eich@suse.de> Date: Mon Feb 25 12:06:49 2013 -0500 DRM/I915: Add enum hpd_pin to intel_encoder. and the follow-up patches to use the new encoder->hpd_pin variable for the different irq setup functions. The problem is that encoder->hpd_pin was set up _before_ the output setup was done and so before we could assess the hotplug capabilities of the outputs on an sdvo encoder. Reported-by: Alex Fiestas <afiestas@kde.org> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=58405 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> [danvet: Add regression note.] Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2013-06-10drm/i915: Fix hotplug interrupt enabling for SDVOCChris Wilson
A broken conditional would lead to SDVOC waiting upon hotplug events on SDVOB - and so miss all activity on its SDVO port. This regression has been introduced in commit 1d843f9de4e6dc6a899b6f07f106c00da09925e6 Author: Egbert Eich <eich@suse.de> Date: Mon Feb 25 12:06:49 2013 -0500 DRM/I915: Add enum hpd_pin to intel_encoder. References: https://bugs.freedesktop.org/show_bug.cgi?id=58405 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> [danvet: Add regression note.] Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2013-06-10batman-adv: Don't handle address updates when bla is disabledSimon Wunderlich
The bridge loop avoidance has a hook to handle address updates of the originator. These should not be handled when bridge loop avoidance is disabled - it might send some bridge loop avoidance packets which should not appear if bla is disabled. Signed-off-by: Simon Wunderlich <simon@open-mesh.com> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <ordex@autistici.org>
2013-06-10batman-adv: forward late OGMs from best next hopSimon Wunderlich
When a packet is received from another node first and later from the best next hop, this packet is dropped. However the first OGM was sent with the BATADV_NOT_BEST_NEXT_HOP flag and thus dropped by neighbors. The late OGM from the best neighbor is then dropped because it is a duplicate. If this situation happens constantly, a node might end up not forwarding the "valid" OGMs anymore, and nodes behind will starve from not getting valid OGMs. Fix this by refining the duplicate checking behaviour: The actions should depend on whether it was a duplicate for a neighbor only or for the originator. OGMs which are not duplicates for a specific neighbor will now be considered in batadv_iv_ogm_forward(), but only actually forwarded for the best next hop. Therefore, late OGMs from the best next hop are forwarded now and not dropped as duplicates anymore. Signed-off-by: Simon Wunderlich <simon@open-mesh.com> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <ordex@autistici.org>
2013-06-10batman-adv: wait for rtnl in batadv_store_mesh_iface instead of failing if ↵Matthias Schiffer
it is taken The rtnl_lock in batadv_store_mesh_iface has been converted to a rtnl_trylock some time ago to avoid a possible deadlock between rtnl and s_active on removal of the sysfs nodes. The behaviour introduced by that was quite confusing as it could lead to the sysfs store to fail, making batman-adv setup scripts unreliable. As recently the sysfs removal was postponed to a worker not running with the rtnl taken, the deadlock can't occur any more and it is safe to change the trylock back to a lock to make the sysfs store reliable again. Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net> Reviewed-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <ordex@autistici.org>
2013-06-09ARM: OMAP5: Remove unused include for ocp2scpTony Lindgren
This header is not used, and is removed with the omap4 clean-up. Signed-off-by: Tony Lindgren <tony@atomide.com>
2013-06-09Merge tag 'omap-devel-a-for-3.11' of ↵Tony Lindgren
git://git.kernel.org/pub/scm/linux/kernel/git/pjw/omap-pending into omap-for-v3.11/omap5 Add support for the OMAP5 SoC family. As part of the transition to DT, no board files will be used for OMAP5. The hwmod data is gradually being transitioned away from arch/arm/mach-omap2: IRQ, DMA, and memory map data has been moved to DT. Hopefully the dev_attr and clock role data will be the next step. Basic test logs are available here, although not for OMAP5, since I don't have an OMAP5 board: http://www.pwsan.com/omap/testlogs/omap5_v3.10/20130608130949/
2013-06-09Merge tag 'omap-devel-b-for-3.11' of ↵Tony Lindgren
http://git.kernel.org/cgit/linux/kernel/git/pjw/omap-pending into omap-for-v3.11/soc A few OMAP clock & hwmod changes for v3.11. Basic test logs are here: http://www.pwsan.com/omap/testlogs/prcm_devel_v3.11/20130609020805/
2013-06-09Merge branch 'merge' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc Pull powerpc fixes from Benjamin Herrenschmidt: "This is purely regressions (though not all recent ones) or stable material" * 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: powerpc: Partial revert of "Context switch more PMU related SPRs" powerpc/perf: Fix deadlock caused by calling printk() in PMU exception powerpc/hw_breakpoints: Add DABRX cpu feature to fix 32-bit regression powerpc/power8: Update denormalization handler powerpc/pseries: Simplify denormalization handler powerpc/power8: Fix oprofile and perf powerpc/eeh: Don't check RTAS token to get PE addr powerpc/pci: Check the bus address instead of resource address in pcibios_fixup_resources
2013-06-09Merge branch 'fixes' of git://git.linaro.org/people/rmk/linux-armLinus Torvalds
Pull ARM fixes from Russell King: "The biggest two fixes are fixing a compilation error with the decompressor, and a problem with our __my_cpu_offset implementation. Other changes are very trivial and small, which seems to be the way for most -rc stuff." * 'fixes' of git://git.linaro.org/people/rmk/linux-arm: ARM: 7747/1: pcpu: ensure __my_cpu_offset cannot be re-ordered across barrier() ARM: 7750/1: update legacy CPU ID in decompressor cache support jump table ARM: 7743/1: compressed/head.S: work around new binutils warning ARM: 7742/1: topology: export cpu_topology ARM: 7737/1: fix kernel decompressor compilation error with CONFIG_DEBUG_SEMIHOSTING
2013-06-10powerpc: Partial revert of "Context switch more PMU related SPRs"Michael Ellerman
In commit 59affcd I added context switching of more PMU SPRs, because they are potentially exposed to userspace on Power8. However despite me being a smart arse in the commit message it's actually not correct. In particular it interacts badly with a global perf record. We will have to do something more complicated, but that will have to wait for 3.11. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-06-10powerpc/perf: Fix deadlock caused by calling printk() in PMU exceptionMichael Ellerman
In commit bc09c21 "Fix finding overflowed PMC in interrupt" we added a printk() to the PMU exception handler. Unfortunately that is not safe. The problem is that the PMU exception may run even when interrupts are soft disabled, aka NMI context. We do this so that we can profile parts of the kernel that have interrupts soft-disabled. But by calling printk() from the exception handler, we can potentially deadlock in the printk code on logbuf_lock, eg: [c00000038ba575c0] c000000000081928 .vprintk_emit+0xa8/0x540 [c00000038ba576a0] c0000000007bcde8 .printk+0x48/0x58 [c00000038ba57710] c000000000076504 .perf_event_interrupt+0x2d4/0x490 [c00000038ba57810] c00000000001f6f8 .performance_monitor_exception+0x48/0x60 [c00000038ba57880] c0000000000032cc performance_monitor_common+0x14c/0x180 --- Exception: f01 (Performance Monitor) at c0000000007b25d4 ._raw_spin_lock_irq +0x64/0xc0 [c00000038ba57bf0] c00000000007ed90 .devkmsg_read+0xd0/0x5a0 [c00000038ba57d00] c0000000001c2934 .vfs_read+0xc4/0x1e0 [c00000038ba57d90] c0000000001c2cd8 .SyS_read+0x58/0xd0 [c00000038ba57e30] c000000000009d54 syscall_exit+0x0/0x98 --- Exception: c01 (System Call) at 00001fffffbf6f7c SP (3ffff6d4de10) is in userspace Fix it by making sure we only call printk() when we are not in NMI context. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Cc: <stable@vger.kernel.org> # 3.9 Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>