From cc664ae026f1b0f3254564a7d45cc29e735c7fed Mon Sep 17 00:00:00 2001 From: Jarod Wilson Date: Fri, 4 Mar 2011 19:53:05 -0300 Subject: [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 Signed-off-by: Mauro Carvalho Chehab --- drivers/staging/lirc/lirc_zilog.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) (limited to 'drivers') 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; } } } -- cgit v1.2.1