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drm/i915/selftests: Avoid ERR_PTR dereference

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Along the early error path for igt_switch_to_kernel_context we may try
to dereference an invalid error pointer. Instead, return early rather
than dump the GEM trace since we haven't yet emitted anything of
interest.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: 09a4c02e58 ("drm/i915: Look for an active kernel context before switching")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180620112441.13085-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2018-06-20 12:24:41 +01:00
parent ac2bf28ad1
commit f648661bc7
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/i915/selftests/i915_gem_context.c
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@ -519,8 +519,8 @@ static int igt_switch_to_kernel_context(void *arg)
mutex_lock(&i915->drm.struct_mutex);
ctx = kernel_context(i915);
if (IS_ERR(ctx)) {
err = PTR_ERR(ctx);
goto out_unlock;
mutex_unlock(&i915->drm.struct_mutex);
return PTR_ERR(ctx);
}
/* First check idling each individual engine */