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drm/i915: Fix off-by-one in reporting hanging process

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ffs() is 1-indexed, but we want to use it as an index into an array, so
use __ffs() instead.

Fixes: eb8d0f5af4 ("drm/i915: Remove GPU reset dependence on struct_mutex")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190315163933.19352-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-03-15 16:39:33 +00:00
parent f19d90eed6
commit 9073e5b267
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/i915_gpu_error.c
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@ -1656,7 +1656,7 @@ error_msg(struct i915_gpu_state *error, unsigned long engines, const char *msg)
i915_error_generate_code(error, engines));
if (engines) {
/* Just show the first executing process, more is confusing */
i = ffs(engines);
i = __ffs(engines);
len += scnprintf(error->error_msg + len,
sizeof(error->error_msg) - len,
", in %s [%d]",