2019-09-19 14:43:19 +00:00
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From 7458efc95816cc9d716d94a4894172c2a9d9fba7 Mon Sep 17 00:00:00 2001
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2019-07-09 18:32:28 +00:00
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From: Lukas Wunner <lukas@wunner.de>
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Date: Wed, 16 Jan 2019 12:22:32 +0100
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2019-09-19 14:43:19 +00:00
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Subject: [PATCH 382/806] bcm2835-mmc: Fix DMA channel leak
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2019-07-09 18:32:28 +00:00
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The BCM2835 MMC host driver requests a DMA channel on probe but neglects
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to release the channel in the probe error path and on driver unbind.
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I'm seeing this happen on every boot of the Compute Module 3: On first
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driver probe, DMA channel 2 is allocated and then leaked with a "could
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not get clk, deferring probe" message. On second driver probe, channel 4
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is allocated.
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Fix it.
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Signed-off-by: Lukas Wunner <lukas@wunner.de>
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Cc: Frank Pavlic <f.pavlic@kunbus.de>
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---
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drivers/mmc/host/bcm2835-mmc.c | 5 +++++
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1 file changed, 5 insertions(+)
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--- a/drivers/mmc/host/bcm2835-mmc.c
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+++ b/drivers/mmc/host/bcm2835-mmc.c
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@@ -1503,6 +1503,8 @@ static int bcm2835_mmc_probe(struct plat
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return 0;
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err:
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+ if (host->dma_chan_rxtx)
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+ dma_release_channel(host->dma_chan_rxtx);
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mmc_free_host(mmc);
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return ret;
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@@ -1548,6 +1550,9 @@ static int bcm2835_mmc_remove(struct pla
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tasklet_kill(&host->finish_tasklet);
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+ if (host->dma_chan_rxtx)
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+ dma_release_channel(host->dma_chan_rxtx);
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+
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mmc_free_host(host->mmc);
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platform_set_drvdata(pdev, NULL);
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