/* * Copyright 2015, Cyril Bur, IBM Corp. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include "basic_asm.h" /* long signal_self(pid_t pid, int sig); */ FUNC_START(signal_self) li r0,37 /* sys_kill */ /* r3 already has our pid in it */ /* r4 already has signal type in it */ sc bc 4,3,1f subfze r3,r3 1: blr FUNC_END(signal_self) /* long tm_signal_self(pid_t pid, int sig, int *ret); */ FUNC_START(tm_signal_self) PUSH_BASIC_STACK(8) std r5,STACK_FRAME_PARAM(0)(sp) /* ret */ tbegin. beq 1f tsuspend. li r0,37 /* sys_kill */ /* r3 already has our pid in it */ /* r4 already has signal type in it */ sc ld r5,STACK_FRAME_PARAM(0)(sp) /* ret */ bc 4,3,2f subfze r3,r3 2: std r3,0(r5) tabort. 0 tresume. /* Be nice to some cleanup, jumps back to tbegin then to 1: */ /* * Transaction should be proper doomed and we should never get * here */ li r3,1 POP_BASIC_STACK(8) blr 1: li r3,0 POP_BASIC_STACK(8) blr FUNC_END(tm_signal_self) value='nds-private-remove' selected='selected'>nds-private-remove net-next plumbingsTobias Klauser
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authorTony Lindgren <tony@atomide.com>2017-01-19 08:49:07 -0800
committerVinod Koul <vinod.koul@intel.com>2017-01-25 11:29:11 +0530
commitae4a3e028bb8b59e7cfeb0cc9ef03d885182ce8b (patch)
tree139fc7e29f97d6bb6c4dca2a97be2dc3f824bd51 /net/ipv4/xfrm4_output.c
parent49def1853334396f948dcb4cedb9347abb318df5 (diff)
dmaengine: cppi41: Fix runtime PM timeouts with USB mass storage
Commit fdea2d09b997 ("dmaengine: cppi41: Add basic PM runtime support") added runtime PM support for cppi41, but had corner case issues. Some of the issues were fixed with commit 098de42ad670 ("dmaengine: cppi41: Fix unpaired pm runtime when only a USB hub is connected"). That fix however caused a new regression where we can get error -115 messages with USB on BeagleBone when connecting a USB mass storage device to a hub. This is because when connecting a USB mass storage device to a hub, the initial DMA transfers can take over 200ms to complete and cppi41 autosuspend delay times out. To fix the issue, we want to implement refcounting for chan_busy array that contains the active dma transfers. Increasing the autosuspend delay won't help as that the delay could be potentially seconds, and it's best to let the USB subsystem to deal with the timeouts on errors. The earlier attempt for runtime PM was buggy as the pm_runtime_get/put() calls could get unpaired easily as they did not follow the state of the chan_busy array as described in commit 098de42ad670 ("dmaengine: cppi41: Fix unpaired pm runtime when only a USB hub is connected". Let's fix the issue by adding pm_runtime_get() to where a new transfer is added to the chan_busy array, and calls to pm_runtime_put() where chan_busy array entry is cleared. This prevents any autosuspend timeouts from happening while dma transfers are active. Fixes: 098de42ad670 ("dmaengine: cppi41: Fix unpaired pm runtime when only a USB hub is connected") Fixes: fdea2d09b997 ("dmaengine: cppi41: Add basic PM runtime support") Cc: Andy Shevchenko <andy.shevchenko@gmail.com> Cc: Bin Liu <b-liu@ti.com> Cc: Grygorii Strashko <grygorii.strashko@ti.com> Cc: Kevin Hilman <khilman@baylibre.com> Cc: Patrick Titiano <ptitiano@baylibre.com> Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Signed-off-by: Tony Lindgren <tony@atomide.com> Tested-by: Bin Liu <b-liu@ti.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'net/ipv4/xfrm4_output.c')