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From 7458efc95816cc9d716d94a4894172c2a9d9fba7 Mon Sep 17 00:00:00 2001
From: Lukas Wunner <lukas@wunner.de>
Date: Wed, 16 Jan 2019 12:22:32 +0100
Subject: [PATCH] bcm2835-mmc: Fix DMA channel leak
The BCM2835 MMC host driver requests a DMA channel on probe but neglects
to release the channel in the probe error path and on driver unbind.
I'm seeing this happen on every boot of the Compute Module 3: On first
driver probe, DMA channel 2 is allocated and then leaked with a "could
not get clk, deferring probe" message. On second driver probe, channel 4
is allocated.
Fix it.
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: Frank Pavlic <f.pavlic@kunbus.de>
---
drivers/mmc/host/bcm2835-mmc.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/drivers/mmc/host/bcm2835-mmc.c
+++ b/drivers/mmc/host/bcm2835-mmc.c
@@ -1503,6 +1503,8 @@ static int bcm2835_mmc_probe(struct plat
return 0;
err:
+ if (host->dma_chan_rxtx)
+ dma_release_channel(host->dma_chan_rxtx);
mmc_free_host(mmc);
return ret;
@@ -1548,6 +1550,9 @@ static int bcm2835_mmc_remove(struct pla
tasklet_kill(&host->finish_tasklet);
+ if (host->dma_chan_rxtx)
+ dma_release_channel(host->dma_chan_rxtx);
+
mmc_free_host(host->mmc);
platform_set_drvdata(pdev, NULL);
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