From: Daniel Vetter Date: Wed, 4 Jul 2012 20:18:42 +0000 (+0200) Subject: drm/i915: properly SIGBUS on I/O errors X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a9340ccab547f24e3b398b7e3ebd792827ff1be1;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git drm/i915: properly SIGBUS on I/O errors ... instead of looping endless with no hope of ever serving that page-fault. We only need to break out of this loop when the gpu died, to run the reset work (and hopefully resurrect it). To clarify questions Chris raised on irc: This is about handling I/O errors not from our own code, but e.g. when the disk died when trying to swap in a gem bo. So this patch remidies the issue that the current handling only handles gpu-death-induced cases of -EIO. Admittedly, dying disks are much rarer than hanging gpus ...To clarify questions Chris raised on irc: This is about handling I/O errors not from our own code, but e.g. when the disk died when trying to swap in a gem bo. So this patch remidies the issue that the current handling only handles gpu-death-induced cases of -EIO. Admittedly, dying disks are much rarer than hanging gpus ... This seems to have been lost in: commit d9bc7e9f32716901c617e1f0fb6ce0f74f172686 Author: Chris Wilson Date: Mon Feb 7 13:09:31 2011 +0000 drm/i915: Fix infinite loop regression from 21dd3734 Reviewed-by: Chris Wilson Tested-by: Chris Wilson Signed-Off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 7d285554333f..2b54142a46ed 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -1141,6 +1141,11 @@ unlock: out: switch (ret) { case -EIO: + /* If this -EIO is due to a gpu hang, give the reset code a + * chance to clean up the mess. Otherwise return the proper + * SIGBUS. */ + if (!atomic_read(&dev_priv->mm.wedged)) + return VM_FAULT_SIGBUS; case -EAGAIN: /* Give the error handler a chance to run and move the * objects off the GPU active list. Next time we service the