From: Borislav Petkov <petkovbb@gmail.com>
Date: Fri, 1 May 2009 18:29:53 +0000 (+0200)
Subject: ide-tape: fix potential fs requests bug
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=10c0b3437c4dc0d14ac254bbe71e54ea5f238d97;p=linux-beck.git

ide-tape: fix potential fs requests bug

ide-tape had a potential bug for fs requests when preparing the command
packet: it was writing the transfer length as a number of fixed blocks.
However, the block layer implies 512 byte blocks and ide-tape can have
other block sizes so account for that too.

ide-floppy does this calculation properly with the block size factor
(floppy->bs_factor).

Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
---

diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index e16604562f28..fc79cf4812f3 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -586,7 +586,7 @@ static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
 				   struct ide_atapi_pc *pc, struct request *rq,
 				   u8 opcode)
 {
-	unsigned int length = blk_rq_sectors(rq);
+	unsigned int length = blk_rq_sectors(rq) / (tape->blk_size >> 9);
 
 	ide_init_pc(pc);
 	put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);