diff options
| author | Mikulas Patocka <mpatocka@redhat.com> | 2018-07-25 15:41:57 +0200 |
|---|---|---|
| committer | Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> | 2018-07-25 15:41:57 +0200 |
| commit | cb782a3fa952478177341e67275885ae52340f99 (patch) | |
| tree | 51e77534b367491c679d4c0e15db6a51dff62d55 /drivers/video | |
| parent | udlfb: avoid prefetch (diff) | |
| download | linux-cb782a3fa952478177341e67275885ae52340f99.tar.xz linux-cb782a3fa952478177341e67275885ae52340f99.zip | |
udlfb: 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: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Diffstat (limited to 'drivers/video')
| -rw-r--r-- | drivers/video/fbdev/udlfb.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/drivers/video/fbdev/udlfb.c b/drivers/video/fbdev/udlfb.c index 589e3fba447b..afbd6101c78e 100644 --- a/drivers/video/fbdev/udlfb.c +++ b/drivers/video/fbdev/udlfb.c @@ -1855,18 +1855,17 @@ static void dlfb_free_urb_list(struct dlfb_data *dlfb) struct list_head *node; struct urb_node *unode; struct urb *urb; - unsigned long flags; /* keep waiting and freeing, until we've got 'em all */ while (count--) { down(&dlfb->urbs.limit_sem); - spin_lock_irqsave(&dlfb->urbs.lock, flags); + spin_lock_irq(&dlfb->urbs.lock); node = dlfb->urbs.list.next; /* have reserved one with sem */ list_del_init(node); - spin_unlock_irqrestore(&dlfb->urbs.lock, flags); + spin_unlock_irq(&dlfb->urbs.lock); unode = list_entry(node, struct urb_node, entry); urb = unode->urb; @@ -1944,7 +1943,6 @@ static struct urb *dlfb_get_urb(struct dlfb_data *dlfb) int ret; struct list_head *entry; struct urb_node *unode; - unsigned long flags; /* Wait for an in-flight buffer to complete and get re-queued */ ret = down_timeout(&dlfb->urbs.limit_sem, GET_URB_TIMEOUT); @@ -1956,14 +1954,14 @@ static struct urb *dlfb_get_urb(struct dlfb_data *dlfb) return NULL; } - spin_lock_irqsave(&dlfb->urbs.lock, flags); + spin_lock_irq(&dlfb->urbs.lock); BUG_ON(list_empty(&dlfb->urbs.list)); /* reserved one with limit_sem */ entry = dlfb->urbs.list.next; list_del_init(entry); dlfb->urbs.available--; - spin_unlock_irqrestore(&dlfb->urbs.lock, flags); + spin_unlock_irq(&dlfb->urbs.lock); unode = list_entry(entry, struct urb_node, entry); return unode->urb; |