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| author | Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> | 2013-08-25 07:38:15 +0400 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2013-08-25 07:38:15 +0400 |
| commit | f936f9b67b7f8c2eae01dd303a0e90bd777c4679 (patch) | |
| tree | f423b47a4c00349be0aeba10c144c82c16fb47e7 | |
| parent | e33c2025c0c2f8a20054c3e031877ff595d1c31f (diff) | |
| download | linux-f936f9b67b7f8c2eae01dd303a0e90bd777c4679.tar.xz | |
mmc: tmio_mmc_dma: fix PIO fallback on SDHI
I'm testing SH-Mobile SDHI driver in DMA mode with a new DMA controller using
'bonnie++' and getting DMA error after which the tmio_mmc_dma.c code falls back
to PIO but all commands time out after that. It turned out that the fallback
code calls tmio_mmc_enable_dma() with RX/TX channels already freed and pointers
to them cleared, so that the function bails out early instead of clearing the
DMA bit in the CTL_DMA_ENABLE register. The regression was introduced by commit
162f43e31c5a376ec16336e5d0ac973373d54c89 (mmc: tmio: fix a deadlock).
Moving tmio_mmc_enable_dma() calls to the top of the PIO fallback code in
tmio_mmc_start_dma_{rx|tx}() helps.
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Acked-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: stable@vger.kernel.org # 3.1+
Signed-off-by: Chris Ball <cjb@laptop.org>
| -rw-r--r-- | drivers/mmc/host/tmio_mmc_dma.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/mmc/host/tmio_mmc_dma.c b/drivers/mmc/host/tmio_mmc_dma.c index 47bdb8fa341b..65edb4a62452 100644 --- a/drivers/mmc/host/tmio_mmc_dma.c +++ b/drivers/mmc/host/tmio_mmc_dma.c @@ -104,6 +104,7 @@ static void tmio_mmc_start_dma_rx(struct tmio_mmc_host *host) pio: if (!desc) { /* DMA failed, fall back to PIO */ + tmio_mmc_enable_dma(host, false); if (ret >= 0) ret = -EIO; host->chan_rx = NULL; @@ -116,7 +117,6 @@ pio: } dev_warn(&host->pdev->dev, "DMA failed: %d, falling back to PIO\n", ret); - tmio_mmc_enable_dma(host, false); } dev_dbg(&host->pdev->dev, "%s(): desc %p, cookie %d, sg[%d]\n", __func__, @@ -185,6 +185,7 @@ static void tmio_mmc_start_dma_tx(struct tmio_mmc_host *host) pio: if (!desc) { /* DMA failed, fall back to PIO */ + tmio_mmc_enable_dma(host, false); if (ret >= 0) ret = -EIO; host->chan_tx = NULL; @@ -197,7 +198,6 @@ pio: } dev_warn(&host->pdev->dev, "DMA failed: %d, falling back to PIO\n", ret); - tmio_mmc_enable_dma(host, false); } dev_dbg(&host->pdev->dev, "%s(): desc %p, cookie %d\n", __func__, |