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authorAtsushi Nemoto <anemo@mba.ocn.ne.jp>2008-12-29 20:27:28 +0100
committerBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2008-12-29 20:27:28 +0100
commita0fce792b55b260589c3d77293a224e84395ec07 (patch)
tree39acc6ac8080ef1081574b4c8b6c737c69b0055e /drivers/ide
parent4a6908a3a050aacc9c3a2f36b276b46c0629ad91 (diff)
downloadop-kernel-dev-a0fce792b55b260589c3d77293a224e84395ec07.zip
op-kernel-dev-a0fce792b55b260589c3d77293a224e84395ec07.tar.gz
tx4939ide: Do not use zero count PRD entry
This fixes data corruption on some heavy load. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Cc: stable <stable@kernel.org> Cc: sshtylyov@ru.mvista.com Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Diffstat (limited to 'drivers/ide')
-rw-r--r--drivers/ide/tx4939ide.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/ide/tx4939ide.c b/drivers/ide/tx4939ide.c
index bafb7d1..30d0d25 100644
--- a/drivers/ide/tx4939ide.c
+++ b/drivers/ide/tx4939ide.c
@@ -259,6 +259,12 @@ static int tx4939ide_build_dmatable(ide_drive_t *drive, struct request *rq)
bcount = 0x10000 - (cur_addr & 0xffff);
if (bcount > cur_len)
bcount = cur_len;
+ /*
+ * This workaround for zero count seems required.
+ * (standard ide_build_dmatable do it too)
+ */
+ if ((bcount & 0xffff) == 0x0000)
+ bcount = 0x8000;
*table++ = bcount & 0xffff;
*table++ = cur_addr;
cur_addr += bcount;
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