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2011-10-31Merge branch 'depends/rmk/gpio' into next/fixesArnd Bergmann
This sorts out merge conflicts with the arm/gpio branch that already got merged into mainline Linux. Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2011-10-30Merge branch 'pxa/fixes' into next/fixesArnd Bergmann
2011-10-30Merge branch 'imx/fixes' into next/fixesArnd Bergmann
2011-10-25ARM: pxa/cm-x300: properly set bt_reset pinAxel Lin
Fix below build warning and properly set bt_reset pin. CC arch/arm/mach-pxa/cm-x300.o arch/arm/mach-pxa/cm-x300.c: In function 'cm_x300_init_wi2wi': arch/arm/mach-pxa/cm-x300.c:779: warning: unused variable 'wlan_en' arch/arm/mach-pxa/cm-x300.c:795: warning: 'bt_reset' may be used uninitialized in this function Signed-off-by: Axel Lin <axel.lin@gmail.com> Cc: <stable@kernel.org> Acked-by: Igor Grinberg <grinberg@compulab.co.il> Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2011-10-25ARM: mmp: rename SHEEVAD to GPLUGDEric Miao
GuruPlugD was initially named to be SHEEVAD, and it's causing naming confusion in the mach-types database. Make it consistent by renaming to GPLUGD. Reported-and-Acked-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Tanmay Upadhyay <tanmay.upadhyay@einfochips.com> Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2011-10-25ARM: imx: Fix typo 'MACH_MX31_3DS_MXC_NAND_USE_BBT'Paul Bolle
Signed-off-by: Paul Bolle <pebolle@tiscali.nl> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2011-10-25ARM: i.MX28: shift frac value in _CLK_SET_RATEMatt Burtch
Noticed when setting SSP0 in clk_set_rate, _CLK_SET_RATE attempts to reset the clock divider for the SSP0 parent clock, in this case IO0FRAC. Bits 24-29 of HW_CLKCTRL_FRAC0 are cleared correctly, but when the new frac value is written the value isn't shifted up to write the correct bit-field. This results in IO0FRAC being set to 0 and CPUFRAC being corrupted. This should occur when writing IO1FRAC, EMIFRAC in HW_CLKCTRL_FRAC0 and GPMIFRAC, HSADCFRAC in HW_CLKCTRL_FRAC1. Tested on custom i.MX28 board with SSP0 SPI driver. Signed-off-by: Matt Burtch <matt@grid-net.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2011-10-25plat-mxc: iomux-v3.h: implicitly enable pull-up/down when that's desiredPaul Fertser
To configure pads during the initialisation a set of special constants is used, e.g. #define MX25_PAD_FEC_MDIO__FEC_MDIO IOMUX_PAD(0x3c4, 0x1cc, 0x10, 0, 0, PAD_CTL_HYS | PAD_CTL_PUS_22K_UP) The problem is that no pull-up/down is getting activated unless both PAD_CTL_PUE (pull-up enable) and PAD_CTL_PKE (pull/keeper module enable) set. This is clearly stated in the i.MX25 datasheet and is confirmed by the measurements on hardware. This leads to some rather hard to understand bugs such as misdetecting an absent ethernet PHY (a real bug i had), unstable data transfer etc. This might affect mx25, mx35, mx50, mx51 and mx53 SoCs. It's reasonable to expect that if the pullup value is specified, the intention was to have it actually active, so we implicitly add the needed bits. Cc: stable@kernel.org Signed-off-by: Paul Fertser <fercerpav@gmail.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2011-10-08Merge branch 'fixes' into next/fixesArnd Bergmann
2011-10-08Merge branch 'imx/fixes' into next/fixesArnd Bergmann
2011-10-08ARM: mx5: fix clock usage for suspendArnaud Patard (Rtp)
While suspending, we're enabling a clock in ->suspend() but we're in atomic context, leading to this : [30803.667305] PM: late suspend of devices complete after 1.237 msecs [30803.667449] BUG: sleeping function called from invalid context at kernel/mutex.c:271 [30803.667464] in_atomic(): 0, irqs_disabled(): 128, pid: 4941, name: pm-suspend [30803.667474] INFO: lockdep is turned off. [30803.667483] irq event stamp: 0 [30803.667489] hardirqs last enabled at (0): [< (null)>] (null) [30803.667503] hardirqs last disabled at (0): [<c001e4a8>] copy_process.part.48+0x1e0/0xa7c [30803.667543] softirqs last enabled at (0): [<c001e4a8>] copy_process.part.48+0x1e0/0xa7c [30803.667562] softirqs last disabled at (0): [< (null)>] (null) [30803.667574] Backtrace: [30803.667611] [<c0010e00>] (dump_backtrace+0x0/0x110) from [<c0424c00>] (dump_stack+0x18/0x1c) [30803.667624] r6:00000000 r5:00000000 r4:d9648000 r3:d9648000 [30803.667652] [<c0424be8>] (dump_stack+0x0/0x1c) from [<c0424eec>] (__might_sleep.part.101+0x90/0xa8) [30803.667673] [<c0424e5c>] (__might_sleep.part.101+0x0/0xa8) from [<c001a5c4>] (__might_sleep+0x80/0x94) [30803.667686] r4:c05d58c0 [30803.667705] [<c001a544>] (__might_sleep+0x0/0x94) from [<c043230c>] (mutex_lock_nested+0x2c/0x30c) [30803.667735] [<c04322e0>] (mutex_lock_nested+0x0/0x30c) from [<c0017834>] (clk_enable+0x28/0x50) [30803.667747] r8:c0438464 r7:00000003 r6:00000000 r5:00000000 r4:c05d2e98 [30803.667780] [<c001780c>] (clk_enable+0x0/0x50) from [<c0017260>] (mx5_suspend_enter+0x1c/0x98) [30803.667792] r4:00000003 r3:c060dfe0 [30803.667821] [<c0017244>] (mx5_suspend_enter+0x0/0x98) from [<c0059b48>] (suspend_enter+0xec/0x15c) [30803.667833] r4:00000003 r3:c0017244 [30803.667856] [<c0059a5c>] (suspend_enter+0x0/0x15c) from [<c0059c4c>] (suspend_devices_and_enter+0x94/0x130) [30803.667868] r6:00000000 r5:00000003 r4:c0c0af00 r3:00002710 [30803.667897] [<c0059bb8>] (suspend_devices_and_enter+0x0/0x130) from [<c0059db0>] (enter_state+0xc8/0x130) [30803.667909] r6:00000000 r5:00000003 r4:c05286e4 [30803.667934] [<c0059ce8>] (enter_state+0x0/0x130) from [<c00592d4>] (state_store+0xac/0xc0) [30803.667945] r6:00000003 r5:00000003 r4:df39d000 r3:00000003 [30803.667978] [<c0059228>] (state_store+0x0/0xc0) from [<c01b0100>] (kobj_attr_store+0x1c/0x28) [30803.668009] [<c01b00e4>] (kobj_attr_store+0x0/0x28) from [<c00e435c>] (sysfs_write_file+0x88/0xbc) [30803.668032] [<c00e42d4>] (sysfs_write_file+0x0/0xbc) from [<c0091fa0>] (vfs_write+0xbc/0x138) [30803.668051] [<c0091ee4>] (vfs_write+0x0/0x138) from [<c0092204>] (sys_write+0x44/0x70) [30803.668062] r8:00000000 r7:00000004 r6:00000003 r5:002694d0 r4:d966acc0 [30803.668094] [<c00921c0>] (sys_write+0x0/0x70) from [<c000db00>] (ret_fast_syscall+0x0/0x3c) [30803.668106] r9:d9648000 r8:c000dcc4 r6:00000001 r5:002694d0 r4:00000003 [30803.669927] PM: early resume of devices complete after 0.972 msecs Just move the clk_enable/disable in ->prepare() and ->finish() Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
2011-10-08ARM: pxa: use correct __iomem annotationsArnd Bergmann
This tries to clear up the confusion between integers and iomem pointers in the marvell pxa platform. MMIO addresses are supposed to be __iomem* values, in order to let the Linux type checking work correctly. This patch moves the cast to __iomem as far back as possible, to the place where the MMIO virtual address windows are defined. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2011-10-08ARM: pxa: sharpsl pm needs SPIArnd Bergmann
The sharpsl code selects the max1111 spi driver, so it must also ensure that SPI itself is enabled. The platform does not work without max1111. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2011-10-08ARM: pxa: centro and treo680 need palm27xArnd Bergmann
The two platforms are part of the palm27x family and use the same code. Select the palm27x symbol to make sure they can be built standalone. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2011-10-08ARM: pxa: make pxafb_smart_*() empty when not enabledEric Miao
Reported-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2011-10-08ARM: pxa: select POWER_SUPPLY on raumfeldArnd Bergmann
The raumfeld platform code calls power_supply_set_battery_charged which is part of the power supply layer, so that always has to be enabled. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2011-10-08ARM: pxa: pxa95x is incompatible with earlier pxaArnd Bergmann
We cannot support ARMv5 and ARMv7 based boards in a single kernel, so introduce a new option in mach-pxa to select between the two. The PJ4 (ARMv7) based boards are now only visible when CONFIG_ARCH_PXA_V7 is set, the other boards are only visible when it's not set. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2011-10-08ARM: pxa: CPU_FREQ_TABLE is needed for CPU_FREQArnd Bergmann
The pxa specific cpufreq code is based on the cpu_freq_table module, so we have to select that. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2011-10-08ARM: pxa: pxa95x/saarb depends on pxa3xx codeEric Miao
saarb uses pxa3xx_map_io and pxa3xx_handle_irq, which are part of the pxa3xx code. This makes sure the necessary header and implementation is used when building the board file. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2011-10-08ARM: pxa: allow selecting just one of TREO680/CENTROArnd Bergmann
There are two variants of the palmtreo machine, the 680 and the centro, and Kconfig allows selecting one or both of them. This changes the board file so that it's actually possible to build all configurations that are allowed. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Marek Vasut <marek.vasut@gmail.com> Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2011-10-08ARM: pxa: export symbols from pxa3xx-ulpiArnd Bergmann
The pxa3xx_u2d_start_hc/pxa3xx_u2d_stop_hc symbols are used by the ohci-pxa27x driver, which can be a module. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Igor Grinberg <grinberg@compulab.co.il> Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2011-10-08ARM: pxa: make zylonite_pxa*_init declaration match codeArnd Bergmann
When support for zylonite is disabled, the zylonite_pxa300_init and zylonite_pxa320_init functions are not there, but the declaration is still kept around if any other boards for the same soc are enabled. This changes the declaration to be conditional on the same symbol as the code. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2011-10-08ARM: pxa/z2: fix building error of pxa27x_cpu_suspend() no longer availableEric Miao
Cc: Vasily Khoruzhick <anarsoul@gmail.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2011-10-07Merge branch 'omap/fixes' into fixesArnd Bergmann
2011-10-07ARM: at91: add defconfig for at91sam9g45 familyNicolas Ferre
Defconfig file for at91sam9g45 SoC family: at91sam9g45, at91sam9g46, at91sam9m10, at91sam9m11. The Atmel Evaluation Kit for this family is the at91sam9m10g45ek. It is so useful for automatic compile tests... Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com> Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
2011-10-07ARM: at91: remove dependency for Atmel PWM driver selector in KconfigNicolas Ferre
Remove dependency line which was not including the SAM9G45. [arnd: added dependency on HAVE_CLK to avoid breaking other machines] Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2011-10-07ARM: mach-ux500: enable fix for ARM errata 754322srinidhi kasagar
This applies ARM errata fix 754322 for all ux500 platforms. Cc: stable@kernel.org Signed-off-by: srinidhi kasagar <srinidhi.kasagar@stericsson.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2011-10-07ARM: pxa: fix building error by palm27x_lcd_init() when FB_PXA not definedEric Miao
Cc: Marek Vasut <marek.vasut@gmail.com> Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2011-10-04Linux 3.1-rc9v3.1-rc9Linus Torvalds
2011-10-04Merge git://github.com/davem330/netLinus Torvalds
* git://github.com/davem330/net: pch_gbe: Fixed the issue on which a network freezes pch_gbe: Fixed the issue on which PC was frozen when link was downed. make PACKET_STATISTICS getsockopt report consistently between ring and non-ring net: xen-netback: correctly restart Tx after a VM restore/migrate bonding: properly stop queuing work when requested can bcm: fix incomplete tx_setup fix RDSRDMA: Fix cleanup of rds_iw_mr_pool net: Documentation: Fix type of variables ibmveth: Fix oops on request_irq failure ipv6: nullify ipv6_ac_list and ipv6_fl_list when creating new socket cxgb4: Fix EEH on IBM P7IOC can bcm: fix tx_setup off-by-one errors MAINTAINERS: tehuti: Alexander Indenbaum's address bounces dp83640: reduce driver noise ptp: fix L2 event message recognition
2011-10-04Merge branch 'fix/asoc' of git://github.com/tiwai/soundLinus Torvalds
* 'fix/asoc' of git://github.com/tiwai/sound: ASoC: omap_mcpdm_remove cannot be __devexit ASoC: Fix setting update bits for WM8753_LADC and WM8753_RADC ASoC: use a valid device for dev_err() in Zylonite
2011-10-04Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linuxLinus Torvalds
* 'drm-fixes' of git://people.freedesktop.org/~airlied/linux: drm/radeon/kms: fix channel_remap setup (v2) drm/radeon: Set cursor x/y to 0 when x/yorigin > 0. drm/radeon: Update AVIVO cursor coordinate origin before x/yorigin calculation. drm/radeon: Simplify cursor x/yorigin calculation. drm/radeon/kms: fix cursor image off-by-one error drm/radeon/kms: Fix logic error in DP HPD handler drm/radeon/kms: add retry limits for native DP aux defer drm/radeon/kms: fix regression in DP aux defer handling
2011-10-04Merge branch 'spi/merge' of git://git.secretlab.ca/git/linux-2.6Linus Torvalds
* 'spi/merge' of git://git.secretlab.ca/git/linux-2.6: spi-topcliff-pch: Fix overrun issue spi-topcliff-pch: Add recovery processing in case FIFO overrun error occurs spi-topcliff-pch: Fix CPU read complete condition issue spi-topcliff-pch: Fix SSN Control issue spi-topcliff-pch: add tx-memory clear after complete transmitting
2011-10-04PCI: Disable MPS configuration by defaultJon Mason
Add the ability to disable PCI-E MPS turning and using the BIOS configured MPS defaults. Due to the number of issues recently discovered on some x86 chipsets, make this the default behavior. Also, add the option for peer to peer DMA MPS configuration. Peer to peer DMA is outside the scope of this patch, but MPS configuration could prevent it from working by having the MPS on one root port different than the MPS on another. To work around this, simply make the system wide MPS the smallest possible value (128B). Signed-off-by: Jon Mason <mason@myri.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-10-04drm/radeon/kms: fix channel_remap setup (v2)Alex Deucher
Most asics just use the hw default value which requires no explicit programming. For those that need a different value, the vbios will program it properly. As such, there's no need to program these registers explicitly in the driver. Changing MC_SHARED_CHREMAP requires a reload of all data in vram otherwise its contents will be scambled. Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=40103 v2: drop now unused channel_remap functions. Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Reviewed-by: Michel Dänzer <michel.daenzer@amd.com> Cc: stable@kernel.org Signed-off-by: Dave Airlie <airlied@redhat.com>
2011-10-04spi-topcliff-pch: Fix overrun issueTomoya MORINAGA
We found that adding load, Rx data sometimes drops.(with DMA transfer mode) The cause is that before starting Rx-DMA processing, Tx-DMA processing starts. This causes FIFO overrun occurs. This patch fixes the issue by modifying FIFO tx-threshold and DMA descriptor size like below. Current this patch Rx-descriptor 4Byte+12Byte*341 --> 12Byte*340-4Byte-12Byte Rx-threshold (Not modified) Tx-descriptor 4Byte+12Byte*341 --> 16Byte-12Byte*340 Rx-threshold 12Byte --> 2Byte Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2011-10-04spi-topcliff-pch: Add recovery processing in case FIFO overrun error occursTomoya MORINAGA
Add recovery processing in case FIFO overrun error occurs with DMA transfer mode. Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2011-10-04spi-topcliff-pch: Fix CPU read complete condition issueTomoya MORINAGA
We found Rx data sometimes drops.(with non-DMA transfer mode) The cause is read complete condition is not true. This patch fixes the issue. Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2011-10-04spi-topcliff-pch: Fix SSN Control issueTomoya MORINAGA
During processing 1 command/data series, SSN should keep LOW. However, currently, SSN becomes HIGH. This patch fixes the issue. Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2011-10-04spi-topcliff-pch: add tx-memory clear after complete transmittingTomoya MORINAGA
Currently, in case of reading date from SPI flash, command is sent twice. The cause is that tx-memory clear processing is missing . This patch adds the tx-momory clear processing. Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2011-10-03lis3: fix regression of HP DriveGuard with 8bit chipTakashi Iwai
Commit 2a7fade7e03 ("hwmon: lis3: Power on corrections") caused a regression on HP laptops with 8bit chip. Writing CTRL2_BOOT_8B bit seems clearing the BIOS setup, and no proper interrupt for DriveGuard will be triggered any more. Since the init code there is basically only for embedded devices, put a pdata check so that the problematic initialization will be skipped for hp_accel stuff. Signed-off-by: Takashi Iwai <tiwai@suse.de> Cc: Eric Piel <eric.piel@tremplin-utc.net> Cc: Samu Onkalo <samu.p.onkalo@nokia.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@google.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-10-03Merge branch 'hwmon-for-linus' of git://github.com/groeck/linuxLinus Torvalds
* 'hwmon-for-linus' of git://github.com/groeck/linux: hwmon: (coretemp) Avoid leaving around dangling pointer hwmon: (coretemp) Fixup platform device ID change
2011-10-03Merge git://github.com/davem330/ideLinus Torvalds
* git://github.com/davem330/ide: ide-disk: Fix request requeuing
2011-10-03Merge branch 'btrfs-3.0' of git://github.com/chrismason/linuxLinus Torvalds
* 'btrfs-3.0' of git://github.com/chrismason/linux: Btrfs: force a page fault if we have a shorty copy on a page boundary
2011-10-03ARM: OMAP: irq: loop counter fix in omap_init_irq()Tapani Utriainen
Fixes bug where variable i was redundantly used for counting two nested loops. Signed-off-by: Tapani Utriainen <tapani@technexion.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
2011-10-03ARM: OMAP4: Keyboard: Fix section mismatch in the board fileBjarne Steinsbo
`keypad_pads' is referred to by `keypad_data' which is not __initdata, so `keypad_pads' should not be __initdata either. Signed-off-by: Bjarne Steinsbo <bsteinsbo@gmail.com> Reviewed-by: Felipe Balbi <balbi@ti.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
2011-10-03ide-disk: Fix request requeuingBorislav Petkov
Simon Kirby reported that on his RAID setup with idedisk underneath the box OOMs after a couple of days of runtime. Running with CONFIG_DEBUG_KMEMLEAK pointed to idedisk_prep_fn() which unconditionally allocates an ide_cmd struct. However, ide_requeue_and_plug() can be called more than once per request, either from the request issue or the IRQ handler path and do blk_peek_request() ends up in idedisk_prep_fn() repeatedly, allocating a struct ide_cmd everytime and "forgetting" the previous pointer. Make sure the code reuses the old allocated chunk. Reported-and-tested-by: Simon Kirby <sim@hostway.ca> Cc: <stable@kernel.org> [ 39.x, 3.0.x ] Link: http://marc.info/?l=linux-kernel&m=131667641517919 Link: http://lkml.kernel.org/r/20110922072643.GA27232@hostway.ca Signed-off-by: Borislav Petkov <bp@alien8.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-10-03pch_gbe: Fixed the issue on which a network freezesToshiharu Okada
The pch_gbe driver has an issue which a network stops, when receiving traffic is high. In the case, The link down and up are necessary to return a network. This patch fixed this issue. Signed-off-by: Toshiharu Okada <toshiharu-linux@dsn.okisemi.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-10-03pch_gbe: Fixed the issue on which PC was frozen when link was downed.Toshiharu Okada
When a link was downed during network use, there is an issue on which PC freezes. This patch fixed this issue. Signed-off-by: Toshiharu Okada <toshiharu-linux@dsn.okisemi.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-10-03make PACKET_STATISTICS getsockopt report consistently between ring and non-ringWillem de Bruijn
This is a minor change. Up until kernel 2.6.32, getsockopt(fd, SOL_PACKET, PACKET_STATISTICS, ...) would return total and dropped packets since its last invocation. The introduction of socket queue overflow reporting [1] changed drop rate calculation in the normal packet socket path, but not when using a packet ring. As a result, the getsockopt now returns different statistics depending on the reception method used. With a ring, it still returns the count since the last call, as counts are incremented in tpacket_rcv and reset in getsockopt. Without a ring, it returns 0 if no drops occurred since the last getsockopt and the total drops over the lifespan of the socket otherwise. The culprit is this line in packet_rcv, executed on a drop: drop_n_acct: po->stats.tp_drops = atomic_inc_return(&sk->sk_drops); As it shows, the new drop number it taken from the socket drop counter, which is not reset at getsockopt. I put together a small example that demonstrates the issue [2]. It runs for 10 seconds and overflows the queue/ring on every odd second. The reported drop rates are: ring: 16, 0, 16, 0, 16, ... non-ring: 0, 15, 0, 30, 0, 46, 0, 60, 0 , 74. Note how the even ring counts monotonically increase. Because the getsockopt adds tp_drops to tp_packets, total counts are similarly reported cumulatively. Long story short, reinstating the original code, as the below patch does, fixes the issue at the cost of additional per-packet cycles. Another solution that does not introduce per-packet overhead is be to keep the current data path, record the value of sk_drops at getsockopt() at call N in a new field in struct packetsock and subtract that when reporting at call N+1. I'll be happy to code that, instead, it's just more messy. [1] http://patchwork.ozlabs.org/patch/35665/ [2] http://kernel.googlecode.com/files/test-packetsock-getstatistics.c Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>