[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>

1 files changed, 7 insertions, 1 deletions

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;
                         }
                 }
         }