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authorMikulas Patocka <mpatocka@redhat.com>2018-07-25 16:41:57 +0300
committerBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>2018-07-25 16:41:57 +0300
commitcb782a3fa952478177341e67275885ae52340f99 (patch)
tree51e77534b367491c679d4c0e15db6a51dff62d55 /drivers/video
parent037dde4113b5d1f886cb621d538438e7af7b6967 (diff)
downloadlinux-cb782a3fa952478177341e67275885ae52340f99.tar.xz
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.c10
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;