mmc: bcm2835: Fix DMA channel leak on probe error

BugLink: https://bugs.launchpad.net/bugs/1837664
commit 8c9620b1cc9b69e82fa8d4081d646d0016b602e7 upstream.

The BCM2835 MMC host driver requests a DMA channel on probe but neglects
to release the channel in the probe error path.  The channel may
therefore be leaked, in particular if devm_clk_get() causes probe
deferral.  Fix it.

Fixes: 660fc733bd74 ("mmc: bcm2835: Add new driver for the sdhost controller.")
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: stable@vger.kernel.org # v4.12+
Cc: Frank Pavlic <f.pavlic@kunbus.de>
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/drivers/mmc/host/bcm2835.c b/drivers/mmc/host/bcm2835.c
index 768972af8b853cf882b1b3311ed8fa1b0a64a49e..0d3b7473bc218b563c71706b40b7987099ac1dec 100644 (file)
--- a/drivers/mmc/host/bcm2835.c
+++ b/drivers/mmc/host/bcm2835.c
@@ -1427,6 +1427,8 @@ static int bcm2835_probe(struct platform_device *pdev)
 
 err:
        dev_dbg(dev, "%s -> err %d\n", __func__, ret);
+       if (host->dma_chan_rxtx)
+               dma_release_channel(host->dma_chan_rxtx);
        mmc_free_host(mmc);
 
        return ret;