On Wed, Jun 05, 2019 at 09:45:56PM +0200, Daniel Vetter wrote:
> 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>
> Signed-off-by: Daniel Vetter <daniel.vet...@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
> ---
> 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 585169f0dcc5..7f35b5ba1924 100644
> --- a/drivers/gpu/drm/drm_debugfs_crc.c
> +++ b/drivers/gpu/drm/drm_debugfs_crc.c
> @@ -396,8 +396,9 @@ 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) {
> @@ -428,7 +429,7 @@ 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
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Ville Syrjälä
Intel
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