linux-kernel - [S390] tape: Compression overwrites crypto setting

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Message-ID: <20070305224032.GE22630@skybase>
Date:	Mon, 5 Mar 2007 23:40:32 +0100
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org
Cc:	holzheu@...ibm.com
Subject: [S390] tape: Compression overwrites crypto setting

From: Michael Holzheu <holzheu@...ibm.com>

[S390] tape: Compression overwrites crypto setting

After switching compression on/off with the mt command, tape encryption is no
longer working. The reason for that is, that the modeset_byte is set to
the compression value instead of using bitwise and/or bit operations to
enable/disable the corresponding bit.

Signed-off-by: Michael Holzheu <holzheu@...ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@...ibm.com>
---

 drivers/s390/char/tape_std.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletion(-)

diff -urpN linux-2.6/drivers/s390/char/tape_std.c linux-2.6-patched/drivers/s390/char/tape_std.c
--- linux-2.6/drivers/s390/char/tape_std.c	2007-02-04 19:44:54.000000000 +0100
+++ linux-2.6-patched/drivers/s390/char/tape_std.c	2007-03-05 22:51:51.000000000 +0100
@@ -647,7 +647,10 @@ tape_std_mtcompression(struct tape_devic
 		return PTR_ERR(request);
 	request->op = TO_NOP;
 	/* setup ccws */
-	*device->modeset_byte = (mt_count == 0) ? 0x00 : 0x08;
+	if (mt_count == 0)
+		*device->modeset_byte &= ~0x08;
+	else
+		*device->modeset_byte |= 0x08;
 	tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte);
 	tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL);
 	/* execute it */
-
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