From: Jarod Wilson <jarod@redhat.com>
Date: Fri, 4 Mar 2011 22:53:05 +0000 (-0300)
Subject: [media] lirc_zilog: error out if buffer read bytes != chunk size
X-Git-Tag: firefly_0821_release~7613^2~1709^2~8
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=cc664ae026f1b0f3254564a7d45cc29e735c7fed;p=firefly-linux-kernel-4.4.55.git

[media] lirc_zilog: error out if buffer read bytes != chunk size

Give it a few tries, then exit. Prevents a possible endless loop
situation.

Signed-off-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
---

diff --git a/drivers/staging/lirc/lirc_zilog.c b/drivers/staging/lirc/lirc_zilog.c
index 407d4b409a8b..dd6a57c3c3a3 100644
--- a/drivers/staging/lirc/lirc_zilog.c
+++ b/drivers/staging/lirc/lirc_zilog.c
@@ -897,7 +897,7 @@ static ssize_t read(struct file *filep, char *outbuf, size_t n, loff_t *ppos)
 	struct IR *ir = filep->private_data;
 	struct IR_rx *rx;
 	struct lirc_buffer *rbuf = ir->l.rbuf;
-	int ret = 0, written = 0;
+	int ret = 0, written = 0, retries = 0;
 	unsigned int m;
 	DECLARE_WAITQUEUE(wait, current);
 
@@ -950,6 +950,12 @@ static ssize_t read(struct file *filep, char *outbuf, size_t n, loff_t *ppos)
 				ret = copy_to_user((void *)outbuf+written, buf,
 						   rbuf->chunk_size);
 				written += rbuf->chunk_size;
+			} else {
+				retries++;
+			}
+			if (retries >= 5) {
+				zilog_error("Buffer read failed!\n");
+				ret = -EIO;
 			}
 		}
 	}