From 5f07ef8f603ace496ca8c20eef446c5ae7a10474 Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Thu, 16 Mar 2017 11:56:02 +0100 Subject: [PATCH] mmc: tmio: always unmap DMA before waiting for interrupt In the (maybe academical) case, we don't get a DATAEND interrupt after DMA completed, we will wait endlessly for the completion to complete. This is not bad per se, since we have a more generic completion tracking a timeout. In that rare case, however, the DMA buffer will not get unmapped and we have a leak. Reorder the code, so unmapping will always take place. Signed-off-by: Wolfram Sang Signed-off-by: Ulf Hansson --- drivers/mmc/host/tmio_mmc_dma.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/mmc/host/tmio_mmc_dma.c b/drivers/mmc/host/tmio_mmc_dma.c index c7684fa91f1f..e2093db2b7ff 100644 --- a/drivers/mmc/host/tmio_mmc_dma.c +++ b/drivers/mmc/host/tmio_mmc_dma.c @@ -47,8 +47,6 @@ static void tmio_mmc_dma_callback(void *arg) { struct tmio_mmc_host *host = arg; - wait_for_completion(&host->dma_dataend); - spin_lock_irq(&host->lock); if (!host->data) @@ -63,6 +61,11 @@ static void tmio_mmc_dma_callback(void *arg) host->sg_ptr, host->sg_len, DMA_TO_DEVICE); + spin_unlock_irq(&host->lock); + + wait_for_completion(&host->dma_dataend); + + spin_lock_irq(&host->lock); tmio_mmc_do_data_irq(host); out: spin_unlock_irq(&host->lock); -- 2.39.2