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mmc: mxcmmc: fix falling back to PIO

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When we can't configure the dma channel we want to fall
back to PIO. We do this by setting host->do_dma to zero.
This does not work as do_dma is used to see whether dma
can be used for the current transfer. Instead, we have
to set host->dma to NULL.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Cc: <stable@kernel.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Sascha Hauer 2011-11-11 16:28:05 +01:00 committed by Chris Ball
parent 053bf34f5a
commit e58f516ff4
1 changed files with 1 additions and 0 deletions
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drivers/mmc/host/mxcmmc.c
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@ -732,6 +732,7 @@ static void mxcmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
"failed to config DMA channel. Falling back to PIO\n");
dma_release_channel(host->dma);
host->do_dma = 0;
host->dma = NULL;
}
}