From: Ville Syrjälä Date: Mon, 9 Mar 2015 19:08:37 +0000 (+0200) Subject: drm/i915: Fix struct_mutex deadlock due to merge fumble X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=3a656b54c8433ada6dd7ee6227854c48682d5e4d;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git drm/i915: Fix struct_mutex deadlock due to merge fumble commit a8c6ecb3be7029881f7c95e5e201a629094a4e1a Merge: 8dd0eb35 9eccca0 Author: Dave Airlie Date: Mon Mar 9 19:58:30 2015 +1000 Merge tag 'v4.0-rc3' into drm-next managed to pick the wrong code to resolve the conflict and left us with a mutex_lock(struct_mutex) without the mutex_unlock(struct_mutex) leading to a deadlock. Fix the problem by recovering the correct code which doesn't need the lock. Cc: Dave Airlie Signed-off-by: Ville Syrjälä Signed-off-by: Dave Airlie --- diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 31f3b11589b9..1aa1cbd16c19 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -12295,9 +12295,7 @@ intel_check_cursor_plane(struct drm_plane *plane, return -ENOMEM; } - /* we only need to pin inside GTT if cursor is non-phy */ - mutex_lock(&dev->struct_mutex); - if (!INTEL_INFO(dev)->cursor_needs_physical && obj->tiling_mode) { + if (fb->modifier[0] != DRM_FORMAT_MOD_NONE) { DRM_DEBUG_KMS("cursor cannot be tiled\n"); ret = -EINVAL; }