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authorJan Kiszka <jan.kiszka@web.de>2010-02-08 10:12:21 +0000
committerDavid S. Miller <davem@davemloft.net>2010-02-16 16:01:25 -0800
commit28a1dbb6f7feade304f43798feb15f6978516624 (patch)
treed21dbbcfa1d9a4ed76ad982cc57970e2eeb966f8 /drivers/isdn/capi/capi.c
parent54f0fad3d8414cf770c1cf25a1d98fcaec899b5a (diff)
CAPI: Fix racy capi_read
capi_read still used interruptible_sleep_on, risking to miss a wakeup this way. Convert it to wait_event_interruptible. Signed-off-by: Jan Kiszka <jan.kiszka@web.de> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/isdn/capi/capi.c')
-rw-r--r--drivers/isdn/capi/capi.c19
1 files changed, 7 insertions, 12 deletions
diff --git a/drivers/isdn/capi/capi.c b/drivers/isdn/capi/capi.c
index f8f86602c57..8abec9655e1 100644
--- a/drivers/isdn/capi/capi.c
+++ b/drivers/isdn/capi/capi.c
@@ -657,24 +657,19 @@ capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
struct capidev *cdev = (struct capidev *)file->private_data;
struct sk_buff *skb;
size_t copied;
+ int err;
if (!cdev->ap.applid)
return -ENODEV;
- if ((skb = skb_dequeue(&cdev->recvqueue)) == NULL) {
-
+ skb = skb_dequeue(&cdev->recvqueue);
+ if (!skb) {
if (file->f_flags & O_NONBLOCK)
return -EAGAIN;
-
- for (;;) {
- interruptible_sleep_on(&cdev->recvwait);
- if ((skb = skb_dequeue(&cdev->recvqueue)) != NULL)
- break;
- if (signal_pending(current))
- break;
- }
- if (skb == NULL)
- return -ERESTARTNOHAND;
+ err = wait_event_interruptible(cdev->recvwait,
+ (skb = skb_dequeue(&cdev->recvqueue)));
+ if (err)
+ return err;
}
if (skb->len > count) {
skb_queue_head(&cdev->recvqueue, skb);