[Intel-gfx] [PATCH] drm/i915/dsc: Fix the deadlock in dsc debugfs node

Manasi Navare manasi.d.navare at intel.com
Wed Dec 19 23:51:20 UTC 2018


The DSC debugfs node causes a possible deadlock situation. This patch
resets the try_again at the beginning of loop to fix this.

Fixes: e845f099f1c6 ('drm/i915/dsc: Add Per connector debugfs node for DSC support/enable')
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=109097
Cc: Lyude Paul <lyude at redhat.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Signed-off-by: Manasi Navare <manasi.d.navare at intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 77486a614614..aca26a25ed50 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -5108,6 +5108,7 @@ static int i915_dsc_fec_support_show(struct seq_file *m, void *data)
 	drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE);
 
 	do {
+		try_again = false;
 		ret = drm_modeset_lock(&dev->mode_config.connection_mutex,
 				       &ctx);
 		if (ret) {
-- 
2.19.1



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