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authorMasahiro Yamada <yamada.masahiro@socionext.com>2020-02-14 16:40:27 +0900
committerPeng Fan <peng.fan@nxp.com>2020-02-20 15:09:57 +0800
commit4155ad9aac9474610038b525da9eec8ad9afbc12 (patch)
tree8f1c1a245a342946660d717db55560f68a31e207 /arch/x86/include/asm
parent58d8ace12be763351df37cdcf6fdfceb646fb4dd (diff)
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 <yamada.masahiro@socionext.com>
Diffstat (limited to 'arch/x86/include/asm')
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