mmc: sh_mmcif: Terminate DMA transactions when detecting timeout or error

If a DMA transaction fails, terminate all outstanding DMA transfers and
unmap buffers.

Signed-off-by: Teppei Kamijou <teppei.kamijou.yb@renesas.com>
Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi.px@renesas.com>
[g.liakhovetski@gmx.de: forward-port, add dma_unmap_sg() in error cases]
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Chris Ball <cjb@laptop.org>

diff --git a/drivers/mmc/host/sh_mmcif.c b/drivers/mmc/host/sh_mmcif.c
index f4b10c8..8aa7b0e 100644 (file)
--- a/drivers/mmc/host/sh_mmcif.c
+++ b/drivers/mmc/host/sh_mmcif.c
@@ -263,15 +263,6 @@ static void mmcif_dma_complete(void *arg)
                 dev_name(&host->pd->dev)))
                return;
 
-       if (data->flags & MMC_DATA_READ)
-               dma_unmap_sg(host->chan_rx->device->dev,
-                            data->sg, data->sg_len,
-                            DMA_FROM_DEVICE);
-       else
-               dma_unmap_sg(host->chan_tx->device->dev,
-                            data->sg, data->sg_len,
-                            DMA_TO_DEVICE);
-
        complete(&host->dma_complete);
 }
 
@@ -1088,14 +1079,20 @@ static bool sh_mmcif_end_cmd(struct sh_mmcif_host *host)
        /* Running in the IRQ thread, can sleep */
        time = wait_for_completion_interruptible_timeout(&host->dma_complete,
                                                         host->timeout);
+
+       if (data->flags & MMC_DATA_READ)
+               dma_unmap_sg(host->chan_rx->device->dev,
+                            data->sg, data->sg_len,
+                            DMA_FROM_DEVICE);
+       else
+               dma_unmap_sg(host->chan_tx->device->dev,
+                            data->sg, data->sg_len,
+                            DMA_TO_DEVICE);
+
        if (host->sd_error) {
                dev_err(host->mmc->parent,
                        "Error IRQ while waiting for DMA completion!\n");
                /* Woken up by an error IRQ: abort DMA */
-               if (data->flags & MMC_DATA_READ)
-                       dmaengine_terminate_all(host->chan_rx);
-               else
-                       dmaengine_terminate_all(host->chan_tx);
                data->error = sh_mmcif_error_manage(host);
        } else if (!time) {
                data->error = -ETIMEDOUT;
@@ -1106,8 +1103,14 @@ static bool sh_mmcif_end_cmd(struct sh_mmcif_host *host)
                        BUF_ACC_DMAREN | BUF_ACC_DMAWEN);
        host->dma_active = false;
 
-       if (data->error)
+       if (data->error) {
                data->bytes_xfered = 0;
+               /* Abort DMA */
+               if (data->flags & MMC_DATA_READ)
+                       dmaengine_terminate_all(host->chan_rx);
+               else
+                       dmaengine_terminate_all(host->chan_tx);
+       }
 
        return false;
 }