This fixes data corruption on some heavy load. Signed-off-by: Atsushi Nemoto <anemo@xxxxxxxxxxxxx> Cc: stable <stable@xxxxxxxxxx> --- drivers/ide/tx4939ide.c | 6 ++++++ 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; -- 1.5.6.3
