spi: spidev_test gives error upon 1-byte transfer

The sample application spidev_test.c is using SPI_IOC_MESSAGE ioctl to do
an SPI transfer.  This ioctl returns the number of bytes successfully
transmitted or a negative error code upon erroneous completion.  The
application however is returning an error if the result of the ioclt if
the return value is 1.  This makes the application to fail upon 1-byte
length transfers.

Signed-off-by: Hector Palacios <hector.palacios@digi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

diff --git a/Documentation/spi/spidev_test.c b/Documentation/spi/spidev_test.c
index 10abd3773e49122aab0dfad27f7cb2c91b8d5d08..16feda9014692a87a4996bf51d759ab9e7500ee5 100644 (file)
--- a/Documentation/spi/spidev_test.c
+++ b/Documentation/spi/spidev_test.c
@@ -58,7 +58,7 @@ static void transfer(int fd)
        };
 
        ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);
-       if (ret == 1)
+       if (ret < 1)
                pabort("can't send spi message");
 
        for (ret = 0; ret < ARRAY_SIZE(tx); ret++) {