From: Daniel Vetter <daniel.vet...@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 <rodrigosiqueiram...@gmail.com>
Cc: Tomeu Vizoso <tomeu.viz...@collabora.com>
Cc: Emil Velikov <emil.veli...@collabora.com>
Cc: Benjamin Gaignard <benjamin.gaign...@linaro.org>
Reviewed-by: Benjamin Gaignard <benjamin.gaign...@linaro.org>
Reviewed-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vet...@intel.com>
Link: 
https://patchwork.freedesktop.org/patch/msgid/20190605194556.16744-1-daniel.vet...@ffwll.ch
Signed-off-by: Sasha Levin <sas...@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 00e743153e94..1a6a5b78e30f 100644
--- a/drivers/gpu/drm/drm_debugfs_crc.c
+++ b/drivers/gpu/drm/drm_debugfs_crc.c
@@ -389,8 +389,9 @@ 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) {
@@ -421,7 +422,7 @@ 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);
 
-- 
2.20.1

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