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udl-kms: use spin_lock_irq instead of spin_lock_irqsave 

spin_lock_irqsave and spin_unlock_irqrestore is inteded to be called from
a context where it is unknown if interrupts are enabled or disabled (such
as interrupt handlers). From a process context, we should call
spin_lock_irq and spin_unlock_irq, that avoids the costly pushf and popf
instructions.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Mikulas Patocka 2018-06-03 16:41:02 +02:00 committed by Dave Airlie
parent 58cba7c222
commit c2f53119b4
2 changed files with 6 additions and 9 deletions
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10
drivers/gpu/drm/udl/udl_main.c
View File

@ -170,7 +170,6 @@ static void udl_free_urb_list(struct drm_device *dev)
struct list_head *node;
struct urb_node *unode;
struct urb *urb;
unsigned long flags;
DRM_DEBUG("Waiting for completes and freeing all render urbs\n");
@ -178,12 +177,12 @@ static void udl_free_urb_list(struct drm_device *dev)
while (count--) {
down(&udl->urbs.limit_sem);
spin_lock_irqsave(&udl->urbs.lock, flags);
spin_lock_irq(&udl->urbs.lock);
node = udl->urbs.list.next; /* have reserved one with sem */
list_del_init(node);
spin_unlock_irqrestore(&udl->urbs.lock, flags);
spin_unlock_irq(&udl->urbs.lock);
unode = list_entry(node, struct urb_node, entry);
urb = unode->urb;
@ -268,7 +267,6 @@ struct urb *udl_get_urb(struct drm_device *dev)
struct list_head *entry;
struct urb_node *unode;
struct urb *urb = NULL;
unsigned long flags;
/* Wait for an in-flight buffer to complete and get re-queued */
ret = down_timeout(&udl->urbs.limit_sem, GET_URB_TIMEOUT);
@ -279,14 +277,14 @@ struct urb *udl_get_urb(struct drm_device *dev)
goto error;
}
spin_lock_irqsave(&udl->urbs.lock, flags);
spin_lock_irq(&udl->urbs.lock);
BUG_ON(list_empty(&udl->urbs.list)); /* reserved one with limit_sem */
entry = udl->urbs.list.next;
list_del_init(entry);
udl->urbs.available--;
spin_unlock_irqrestore(&udl->urbs.lock, flags);
spin_unlock_irq(&udl->urbs.lock);
unode = list_entry(entry, struct urb_node, entry);
urb = unode->urb;

5
drivers/gpu/drm/udl/udl_modeset.c
View File

@ -366,7 +366,6 @@ static int udl_crtc_page_flip(struct drm_crtc *crtc,
{
struct udl_framebuffer *ufb = to_udl_fb(fb);
struct drm_device *dev = crtc->dev;
unsigned long flags;
struct drm_framebuffer *old_fb = crtc->primary->fb;
if (old_fb) {
@ -377,10 +376,10 @@ static int udl_crtc_page_flip(struct drm_crtc *crtc,
udl_handle_damage(ufb, 0, 0, fb->width, fb->height);
spin_lock_irqsave(&dev->event_lock, flags);
spin_lock_irq(&dev->event_lock);
if (event)
drm_crtc_send_vblank_event(crtc, event);
spin_unlock_irqrestore(&dev->event_lock, flags);
spin_unlock_irq(&dev->event_lock);
crtc->primary->fb = fb;
return 0;