| Date | Thu, 15 Jan 2009 11:57:38 -0800 | From | Greg KH <> | Subject | [patch 12/94] tx4939ide: Do not use zero count PRD entry |
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2.6.28-stable review patch. If anyone has any objections, please let us know.
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From: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
commit a0fce792b55b260589c3d77293a224e84395ec07 upstream.
This fixes data corruption on some heavy load.
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Cc: sshtylyov@ru.mvista.com Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- drivers/ide/tx4939ide.c | 6 ++++++ 1 file changed, 6 insertions(+)
--- a/drivers/ide/tx4939ide.c +++ b/drivers/ide/tx4939ide.c @@ -259,6 +259,12 @@ static int tx4939ide_build_dmatable(ide_ 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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