On 09/09/2013 17:29, [email protected] :
From: Ludovic Desroches <[email protected]>
When a software timeout occurs, the transfer is not stopped. In DMA case, it
causes DMA channel to be stuck because the transfer is still active causing
following transfers to be queued but not computed.
Cc: <[email protected]> #3.9+
Signed-off-by: Ludovic Desroches <[email protected]>
Acked-by: Nicolas Ferre <[email protected]>
Thanks.
Reported-by: Alexander Morozov <[email protected]>
---
drivers/mmc/host/atmel-mci.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index bdb84da..e9ea2fc 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -582,6 +582,13 @@ static void atmci_timeout_timer(unsigned long data)
if (host->mrq->cmd->data) {
host->mrq->cmd->data->error = -ETIMEDOUT;
host->data = NULL;
+ /*
+ * With some SDIO modules, sometimes DMA transfer hangs. If
+ * stop_transfer() is not called then the DMA request is not
+ * removed, following ones are queued and never computed.
+ */
+ if (host->state == STATE_DATA_XFER)
+ host->stop_transfer(host);
} else {
host->mrq->cmd->error = -ETIMEDOUT;
host->cmd = NULL;
--
Nicolas Ferre
--
To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
