From 32cd11a61007511ddb38783deec8bb1aa6735789 Mon Sep 17 00:00:00 2001 From: Mark Lord Date: Sun, 1 Feb 2009 16:50:32 -0500 Subject: [PATCH] sata_mv: mv_fill_sg fixes v2 Fix mv_fill_sg() to zero out the reserved word (required for ATAPI), and to include a memory barrier. This may also help with problems reported by Jens on the PPC platform. Signed-off-by: Mark Lord Signed-off-by: Jeff Garzik --- drivers/ata/sata_mv.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c index 181f02127410..9c8ea2c1116d 100644 --- a/drivers/ata/sata_mv.c +++ b/drivers/ata/sata_mv.c @@ -1364,12 +1364,13 @@ static void mv_fill_sg(struct ata_queued_cmd *qc) u32 offset = addr & 0xffff; u32 len = sg_len; - if ((offset + sg_len > 0x10000)) + if (offset + len > 0x10000) len = 0x10000 - offset; mv_sg->addr = cpu_to_le32(addr & 0xffffffff); mv_sg->addr_hi = cpu_to_le32((addr >> 16) >> 16); mv_sg->flags_size = cpu_to_le32(len & 0xffff); + mv_sg->reserved = 0; sg_len -= len; addr += len; @@ -1381,6 +1382,7 @@ static void mv_fill_sg(struct ata_queued_cmd *qc) if (likely(last_sg)) last_sg->flags_size |= cpu_to_le32(EPRD_FLAG_END_OF_TBL); + mb(); /* ensure data structure is visible to the chipset */ } static void mv_crqb_pack_cmd(__le16 *cmdw, u8 data, u8 addr, unsigned last) -- 2.39.5