From: Jonathan Cameron <jic23@cam.ac.uk>
Date: Tue, 4 May 2010 13:43:11 +0000 (+0100)
Subject: staging:iio:ring_sw: Fix incorrect test on successful read of last value, causes... 
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=8474ddd7cba04c2e8d8691abda32ae0f4a684137;p=linux-beck.git

staging:iio:ring_sw: Fix incorrect test on successful read of last value, causes infinite loop

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/staging/iio/ring_sw.c b/drivers/staging/iio/ring_sw.c
index f8de45dc4b6e..5ee3e4533515 100644
--- a/drivers/staging/iio/ring_sw.c
+++ b/drivers/staging/iio/ring_sw.c
@@ -295,7 +295,7 @@ again:
 		return -EAGAIN;
 	memcpy(data, last_written_p_copy, ring->buf.bpd);
 
-	if (unlikely(ring->last_written_p >= last_written_p_copy))
+	if (unlikely(ring->last_written_p != last_written_p_copy))
 		goto again;
 
 	iio_unmark_sw_rb_in_use(&ring->buf);