From 2232f0315c6688f5ff6b2067ea88d97542034873 Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Thu, 4 Sep 2014 09:36:18 +0200 Subject: [PATCH] drm/i915: Fix EIO/wedged handling in gem fault handler In commit 1f83fee08d625f8d0130f9fe5ef7b17c2e022f3c Author: Daniel Vetter Date: Thu Nov 15 17:17:22 2012 +0100 drm/i915: clear up wedged transitions I've accidentally inverted the EIO/wedged handling in the fault handler: We want to return the EIO as a SIGBUS only if it's not because of the gpu having died, to prevent userspace from unduly dying. In my defence the comment right above is completely misleading, so fix both. v2: Drop the WARN_ON, it's not actually a bug to e.g. receive an -EIO when swap-in fails. v3: Don't remove too much ... oops. Reported-by: Chris Wilson Cc: Chris Wilson Cc: stable@vger.kernel.org Signed-off-by: Daniel Vetter Reviewed-by: Chris Wilson Signed-off-by: Jani Nikula --- drivers/gpu/drm/i915/i915_gem.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index ba7f5c6..ad55b06 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -1590,10 +1590,13 @@ 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 (i915_terminally_wedged(&dev_priv->gpu_error)) { + /* + * We eat errors when the gpu is terminally wedged to avoid + * userspace unduly crashing (gl has no provisions for mmaps to + * fail). But any other -EIO isn't ours (e.g. swap in failure) + * and so needs to be reported. + */ + if (!i915_terminally_wedged(&dev_priv->gpu_error)) { ret = VM_FAULT_SIGBUS; break; } -- 2.7.4