mmc: bcm2835: Drop DMA channel error pointer check

bcm2835_add_host() invokes IS_ERR_OR_NULL() on a DMA channel pointer,
however dma_request_slave_channel() (which was used to populate the
pointer) never returns an error pointer.  So a NULL pointer check is
sufficient.

Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: Frank Pavlic <f.pavlic@kunbus.de>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/bcm2835.c b/drivers/mmc/host/bcm2835.c
index c9e7aa5..ab8d58a 100644 (file)
--- a/drivers/mmc/host/bcm2835.c
+++ b/drivers/mmc/host/bcm2835.c
@@ -1286,7 +1286,7 @@ static int bcm2835_add_host(struct bcm2835_host *host)
        spin_lock_init(&host->lock);
        mutex_init(&host->mutex);
 
-       if (IS_ERR_OR_NULL(host->dma_chan_rxtx)) {
+       if (!host->dma_chan_rxtx) {
                dev_warn(dev, "unable to initialise DMA channel. Falling back to PIO\n");
                host->use_dma = false;
        } else {