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mmc: dw_mmc: Fix switch from DMA to PIO 

When dw_mci_pre_dma_transfer returns failure in some reasons,
dw_mci_submit_data will prepare to switch the PIO mode from DMA.
After switching to PIO mode, DMA(IDMAC in particular) is still
enabled. This makes the corruption in handling interrupt and
the driver lock-up.

Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Acked-by: Will Newton <will.newton@imgtec.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Seungwon Jeon 2012-04-10 09:53:32 +09:00 committed by Chris Ball
parent 32d317c60e
commit a99aa9b9b4
1 changed files with 3 additions and 1 deletions
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4
drivers/mmc/host/dw_mmc.c
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@ -526,8 +526,10 @@ static int dw_mci_submit_data_dma(struct dw_mci *host, struct mmc_data *data)
return -ENODEV;
sg_len = dw_mci_pre_dma_transfer(host, data, 0);
if (sg_len < 0)
if (sg_len < 0) {
host->dma_ops->stop(host);
return sg_len;
}
host->using_dma = 1;