From: Peter Meerwald <pmeerw@pmeerw.net>
Date: Sat, 6 Dec 2014 06:00:00 +0000 (+0000)
Subject: staging:iio: Fix error handling in generic_buffer example
X-Git-Tag: v3.17-rc1~123^2~1942^2~7
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=97b603a4e96565c3a3b09b9a4131d4107b0c6581;p=karo-tx-linux.git

staging:iio: Fix error handling in generic_buffer example

read() does not return -EAGAIN
read() returns -1 and the errno value needs to be checked for -EAGAIN

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
---

diff --git a/drivers/staging/iio/Documentation/generic_buffer.c b/drivers/staging/iio/Documentation/generic_buffer.c
index 40d0ecac047f..044ea196aa6f 100644
--- a/drivers/staging/iio/Documentation/generic_buffer.c
+++ b/drivers/staging/iio/Documentation/generic_buffer.c
@@ -305,9 +305,12 @@ int main(int argc, char **argv)
 		read_size = read(fp,
 				 data,
 				 toread*scan_size);
-		if (read_size == -EAGAIN) {
-			printf("nothing available\n");
-			continue;
+		if (read_size < 0) {
+			if (errno == -EAGAIN) {
+				printf("nothing available\n");
+				continue;
+			} else
+				break;
 		}
 		for (i = 0; i < read_size/scan_size; i++)
 			process_scan(data + scan_size*i,