atmel_spi: support zero length transfer

[linux-2.6-omap-h63xx.git] / drivers / spi / atmel_spi.c

diff --git a/drivers/spi/atmel_spi.c b/drivers/spi/atmel_spi.c
index 85687aaf9cabf5876381d647764613a13a9aab9e..02c8e305b14fd783e3b94a71d3c8b4d9c4ed9c68 100644 (file)
--- a/drivers/spi/atmel_spi.c
+++ b/drivers/spi/atmel_spi.c
@@ -616,7 +616,7 @@ static int atmel_spi_transfer(struct spi_device *spi, struct spi_message *msg)
                return -ESHUTDOWN;
 
        list_for_each_entry(xfer, &msg->transfers, transfer_list) {
-               if (!(xfer->tx_buf || xfer->rx_buf)) {
+               if (!(xfer->tx_buf || xfer->rx_buf) && xfer->len) {
                        dev_dbg(&spi->dev, "missing rx or tx buf\n");
                        return -EINVAL;
                }
@@ -863,3 +863,4 @@ module_exit(atmel_spi_exit);
 MODULE_DESCRIPTION("Atmel AT32/AT91 SPI Controller driver");
 MODULE_AUTHOR("Haavard Skinnemoen <hskinnemoen@atmel.com>");
 MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:atmel_spi");