From c1fa3426aa5c782724c97394303d52228206eda4 Mon Sep 17 00:00:00 2001 From: Ludovic Desroches Date: Mon, 9 Sep 2013 17:29:56 +0200 Subject: [PATCH] mmc: atmel-mci: abort transfer on timeout error 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: # 3.9+ Signed-off-by: Ludovic Desroches Reported-by: Alexander Morozov Acked-by: Nicolas Ferre Signed-off-by: Chris Ball --- 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 69e438e..b8dfe0d 100644 --- a/drivers/mmc/host/atmel-mci.c +++ b/drivers/mmc/host/atmel-mci.c @@ -589,6 +589,13 @@ 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; -- 2.7.4