Re: [PATCH] tx4939ide: Do not use zero count PRD entry

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Hello.

Atsushi Nemoto wrote:

This fixes data corruption on some heavy load.

Signed-off-by: Atsushi Nemoto <anemo@xxxxxxxxxxxxx>

Acked-by: Sergei Shtylyov <sshtylyov@xxxxxxxxxxxxx>

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)

   s/do/does/

+			 */
+			if ((bcount & 0xffff) == 0x0000)

  Why not just bcount == 0x10000?

MBR, Sergei




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