From: Jan Kiszka <jan.kiszka@web.de>
Date: Mon, 8 Feb 2010 10:12:21 +0000 (+0000)
Subject: CAPI: Fix racy capi_read
X-Git-Tag: firefly_0821_release~9833^2~3055^2~267
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=28a1dbb6f7feade304f43798feb15f6978516624;p=firefly-linux-kernel-4.4.55.git

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>
---

diff --git a/drivers/isdn/capi/capi.c b/drivers/isdn/capi/capi.c
index f8f86602c57e..8abec9655e1a 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);