drm/i915: Only emit the 'send bug report' once for a GPU hang

Submitted by Chris Wilson on Aug. 16, 2019, 10:37 a.m.

Details

Message ID 20190816103731.9073-1-chris@chris-wilson.co.uk
State Accepted
Commit a1e37b0259e77b1db2ff2636059cd513971ca7fa
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Series "drm/i915: Only emit the 'send bug report' once for a GPU hang" ( rev: 1 ) in Intel GFX

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Commit Message

Chris Wilson Aug. 16, 2019, 10:37 a.m.
Use a locked xchg to ensure that the global log message giving
instructions on how to send a bug report is emitted precisely once.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_gpu_error.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

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diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index b0ae055b6c82..e284bd76fa86 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -1765,7 +1765,7 @@  void i915_capture_error_state(struct drm_i915_private *i915,
 		return;
 	}
 
-	if (!warned &&
+	if (!xchg(&warned, true) &&
 	    ktime_get_real_seconds() - DRIVER_TIMESTAMP < DAY_AS_SECONDS(180)) {
 		pr_info("GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.\n");
 		pr_info("Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel\n");
@@ -1773,7 +1773,6 @@  void i915_capture_error_state(struct drm_i915_private *i915,
 		pr_info("The GPU crash dump is required to analyze GPU hangs, so please always attach it.\n");
 		pr_info("GPU crash dump saved to /sys/class/drm/card%d/error\n",
 			i915->drm.primary->index);
-		warned = true;
 	}
 }