From a1969923c90c64ac55f80f14a7ca3ea2c766d079 Mon Sep 17 00:00:00 2001 From: Anton staaf Date: Tue, 4 Oct 2011 11:24:50 +0000 Subject: [PATCH] mmc: dcache: allocate cache aligned buffers for ext_csd Currently the mmc_change_freq and mmc_startup functions allocates buffers on the stack that are passed down to the MMC device driver. These buffers could be unaligned to the L1 dcache line size. This causes problems when using DMA and with caches enabled. This patch correctly cache alignes the buffers used for reading the ext_csd data from an MMC device. Signed-off-by: Anton Staaf Cc: Lukasz Majewski Cc: Mike Frysinger Cc: Albert ARIBAUD --- drivers/mmc/mmc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index ba6fbfe7ac..e5fedb3951 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -618,7 +618,7 @@ int mmc_switch(struct mmc *mmc, u8 set, u8 index, u8 value) int mmc_change_freq(struct mmc *mmc) { - char ext_csd[512]; + ALLOC_CACHE_ALIGN_BUFFER(char, ext_csd, 512); char cardtype; int err; @@ -860,7 +860,7 @@ int mmc_startup(struct mmc *mmc) uint mult, freq; u64 cmult, csize, capacity; struct mmc_cmd cmd; - char ext_csd[512]; + ALLOC_CACHE_ALIGN_BUFFER(char, ext_csd, 512); int timeout = 1000; #ifdef CONFIG_MMC_SPI_CRC_ON -- 2.39.5