From: Masahiro Yamada Date: Fri, 14 Feb 2020 07:40:27 +0000 (+0900) Subject: mmc: sdhci: fix missing cache invalidation after reading by DMA X-Git-Url: http://git.dujemihanovic.xyz/login.html?a=commitdiff_plain;h=4155ad9aac9474610038b525da9eec8ad9afbc12;p=u-boot.git mmc: sdhci: fix missing cache invalidation after reading by DMA This driver currently performs cache operation before the DMA start, but does nothing after the DMA completion. When reading data by DMA, the cache invalidation is needed also after finishing the DMA transfer. Otherwise, the CPU might read data from the cache instead of from the main memory when speculative memory read or memory prefetch occurs. Instead of calling the cache operation directly, this commit adds dma_unmap_single(), which performs cache invalidation internally, but drivers do not need which operation is being run. Signed-off-by: Masahiro Yamada --- diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c index 77a88bc043..9b7c5f8f68 100644 --- a/drivers/mmc/sdhci.c +++ b/drivers/mmc/sdhci.c @@ -215,6 +215,10 @@ static int sdhci_transfer_data(struct sdhci_host *host, struct mmc_data *data) return -ETIMEDOUT; } } while (!(stat & SDHCI_INT_DATA_END)); + + dma_unmap_single(host->start_addr, data->blocks * data->blocksize, + mmc_get_dma_dir(data)); + return 0; }