mmc: bcm2835: Fix DMA channel leak on probe error

l1k · storulf · commit 8c9620b1cc9b · 2019-01-28T12:43:19.000+01:00
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: 660fc73 ("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>
diff --git a/drivers/mmc/host/bcm2835.c b/drivers/mmc/host/bcm2835.c
@@ -1431,6 +1431,8 @@ 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;
