From: Daniel Vetter daniel.vetter@ffwll.ch
[ Upstream commit 1882018a70e06376234133e69ede9dd743b4dbd9 ]
We can be called from any context, we need to be prepared.
Noticed this while hacking on vkms, which calls this function from a normal worker. Which really upsets lockdep.
Cc: Rodrigo Siqueira rodrigosiqueiramelo@gmail.com Cc: Tomeu Vizoso tomeu.vizoso@collabora.com Cc: Emil Velikov emil.velikov@collabora.com Cc: Benjamin Gaignard benjamin.gaignard@linaro.org Reviewed-by: Benjamin Gaignard benjamin.gaignard@linaro.org Reviewed-by: Ville Syrjälä ville.syrjala@linux.intel.com Signed-off-by: Daniel Vetter daniel.vetter@intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20190605194556.16744-1-daniel.... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/drm_debugfs_crc.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_debugfs_crc.c b/drivers/gpu/drm/drm_debugfs_crc.c index 99961192bf03..a334a82fcb36 100644 --- a/drivers/gpu/drm/drm_debugfs_crc.c +++ b/drivers/gpu/drm/drm_debugfs_crc.c @@ -379,8 +379,9 @@ int drm_crtc_add_crc_entry(struct drm_crtc *crtc, bool has_frame, struct drm_crtc_crc *crc = &crtc->crc; struct drm_crtc_crc_entry *entry; int head, tail; + unsigned long flags;
- spin_lock(&crc->lock); + spin_lock_irqsave(&crc->lock, flags);
/* Caller may not have noticed yet that userspace has stopped reading */ if (!crc->entries) { @@ -411,7 +412,7 @@ int drm_crtc_add_crc_entry(struct drm_crtc *crtc, bool has_frame, head = (head + 1) & (DRM_CRC_ENTRIES_NR - 1); crc->head = head;
- spin_unlock(&crc->lock); + spin_unlock_irqrestore(&crc->lock, flags);
wake_up_interruptible(&crc->wq);