From: Catalin Marinas Date: Thu, 4 Feb 2010 06:04:50 +0000 (-0500) Subject: [libata] Call flush_dcache_page after PIO data transfers in libata-sff.c X-Git-Tag: firefly_0821_release~9833^2~3224^2 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=2d68b7fe55d9e19a8a868224ed0dfd6526568521;p=firefly-linux-kernel-4.4.55.git [libata] Call flush_dcache_page after PIO data transfers in libata-sff.c flush_dcache_page() must be called after (!ATA_TFLAG_WRITE) the data copying to avoid D-cache aliasing with user space or I-D cache coherency issues (when reading data from an ATA device using PIO, the kernel dirties the D-cache but there is no flush_dcache_page() required on Harvard architectures). Signed-off-by: Catalin Marinas Signed-off-by: Jeff Garzik --- diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c index 741065c9da67..730ef3c384ca 100644 --- a/drivers/ata/libata-sff.c +++ b/drivers/ata/libata-sff.c @@ -893,6 +893,9 @@ static void ata_pio_sector(struct ata_queued_cmd *qc) do_write); } + if (!do_write) + flush_dcache_page(page); + qc->curbytes += qc->sect_size; qc->cursg_ofs += qc->sect_size;