Commit a0fce792 authored by Atsushi Nemoto's avatar Atsushi Nemoto Committed by Bartlomiej Zolnierkiewicz
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tx4939ide: Do not use zero count PRD entry 



This fixes data corruption on some heavy load.

Signed-off-by: default avatarAtsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: stable <stable@kernel.org>
Cc: sshtylyov@ru.mvista.com
Signed-off-by: default avatarBartlomiej Zolnierkiewicz <bzolnier@gmail.com>
parent 4a6908a3

drivers/ide/tx4939ide.c

+6 −0
Original line number Diff line number Diff line
@@ -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;