In commit af7ddd8a627c ("Merge tag 'dma-mapping-4.21' of git://git.infradead.org/users/hch/dma-mapping"), dmam_alloc_coherent has already zeroed the memory. So memset is not needed. Signed-off-by: Fuqian Huang <huangfq.daxian@xxxxxxxxx> --- drivers/ata/libahci.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c index 0984c4b76d7e..e4c45d3cca79 100644 --- a/drivers/ata/libahci.c +++ b/drivers/ata/libahci.c @@ -2365,7 +2365,6 @@ static int ahci_port_start(struct ata_port *ap) mem = dmam_alloc_coherent(dev, dma_sz, &mem_dma, GFP_KERNEL); if (!mem) return -ENOMEM; - memset(mem, 0, dma_sz); /* * First item in chunk of DMA memory: 32-slot command table, -- 2.11.0