drm/vblank: Use spin_(un)lock_irq() in drm_crtc_vblank_off()

This got me confused for a bit while looking over this code: I had been
planning on adding some blocking function calls into this function, but
seeing the irqsave/irqrestore variants of spin_(un)lock() didn't make it
very clear whether or not that would actually be safe.

So I went ahead and reviewed every single driver in the kernel that uses
this function, and they all fall into three categories:

* Driver probe code
* ->atomic_disable() callbacks
* Legacy modesetting callbacks

All of these will be guaranteed to have IRQs enabled, which means it's
perfectly safe to block here. Just to make things a little less
confusing to others in the future, let's switch over to
spin_lock_irq()/spin_unlock_irq() to make that fact a little more
obvious.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Daniel Vetter <daniel@ffwll.ch>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: Dave Airlie <airlied@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200627194657.156514-3-lyude@redhat.com

diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c
index 4b0a9b2..e277e40 100644 (file)
--- a/drivers/gpu/drm/drm_vblank.c
+++ b/drivers/gpu/drm/drm_vblank.c
@@ -1283,13 +1283,12 @@ void drm_crtc_vblank_off(struct drm_crtc *crtc)
        struct drm_pending_vblank_event *e, *t;
 
        ktime_t now;
-       unsigned long irqflags;
        u64 seq;
 
        if (drm_WARN_ON(dev, pipe >= dev->num_crtcs))
                return;
 
-       spin_lock_irqsave(&dev->event_lock, irqflags);
+       spin_lock_irq(&dev->event_lock);
 
        spin_lock(&dev->vbl_lock);
        drm_dbg_vbl(dev, "crtc %d, vblank enabled %d, inmodeset %d\n",
@@ -1325,7 +1324,7 @@ void drm_crtc_vblank_off(struct drm_crtc *crtc)
                drm_vblank_put(dev, pipe);
                send_vblank_event(dev, e, seq, now);
        }
-       spin_unlock_irqrestore(&dev->event_lock, irqflags);
+       spin_unlock_irq(&dev->event_lock);
 
        /* Will be reset by the modeset helpers when re-enabling the crtc by
         * calling drm_calc_timestamping_constants(). */