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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 <mlord@pobox.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Mark Lord 2009-02-01 16:50:32 -05:00 committed by Jeff Garzik
parent 95db505125
commit 32cd11a610
1 changed files with 3 additions and 1 deletions
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4
drivers/ata/sata_mv.c
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@ -1364,12 +1364,13 @@ static void mv_fill_sg(struct ata_queued_cmd *qc)
u32 offset = addr & 0xffff; u32 offset = addr & 0xffff;
u32 len = sg_len; u32 len = sg_len;
if ((offset + sg_len > 0x10000)) if (offset + len > 0x10000)
len = 0x10000 - offset; len = 0x10000 - offset;
mv_sg->addr = cpu_to_le32(addr & 0xffffffff); mv_sg->addr = cpu_to_le32(addr & 0xffffffff);
mv_sg->addr_hi = cpu_to_le32((addr >> 16) >> 16); mv_sg->addr_hi = cpu_to_le32((addr >> 16) >> 16);
mv_sg->flags_size = cpu_to_le32(len & 0xffff); mv_sg->flags_size = cpu_to_le32(len & 0xffff);
mv_sg->reserved = 0;
sg_len -= len; sg_len -= len;
addr += len; addr += len;
@ -1381,6 +1382,7 @@ static void mv_fill_sg(struct ata_queued_cmd *qc)
if (likely(last_sg)) if (likely(last_sg))
last_sg->flags_size |= cpu_to_le32(EPRD_FLAG_END_OF_TBL); 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) static void mv_crqb_pack_cmd(__le16 *cmdw, u8 data, u8 addr, unsigned last)