From: Daniel Vetter Date: Mon, 23 Nov 2015 09:32:47 +0000 (+0100) Subject: drm/tegra: Don't take dev->struct_mutex in mmap offset ioctl X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d849c82fac61921301cf2d6f0a3477a121a2ef2a;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git drm/tegra: Don't take dev->struct_mutex in mmap offset ioctl Since David Herrmann's mmap vma manager rework we don't need to grab dev->struct_mutex any more to prevent races when looking up the mmap offset. Drop it and instead don't forget to use the unref_unlocked variant (since the drm core still cares). v2: Finally get rid of the copypasta from another commit in this commit message. And convert to _unlocked like we need to (Patrik). Cc: Patrik Jakobsson Cc: Thierry Reding Acked-by: Thierry Reding Reviewed-by: Patrik Jakobsson Signed-off-by: Daniel Vetter Signed-off-by: Thierry Reding --- diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c index 01e16e146bfe..fb712316c522 100644 --- a/drivers/gpu/drm/tegra/gem.c +++ b/drivers/gpu/drm/tegra/gem.c @@ -408,12 +408,9 @@ int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm, struct drm_gem_object *gem; struct tegra_bo *bo; - mutex_lock(&drm->struct_mutex); - gem = drm_gem_object_lookup(drm, file, handle); if (!gem) { dev_err(drm->dev, "failed to lookup GEM object\n"); - mutex_unlock(&drm->struct_mutex); return -EINVAL; } @@ -421,9 +418,7 @@ int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm, *offset = drm_vma_node_offset_addr(&bo->gem.vma_node); - drm_gem_object_unreference(gem); - - mutex_unlock(&drm->struct_mutex); + drm_gem_object_unreference_unlocked(gem); return 0; }