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>

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__,