linux-kernel - [PATCH 7/11] rsxx: Fixes DLPAR add kernel panic if partition still mounted.

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Date:	Tue, 18 Jun 2013 14:46:04 -0500
From:	"Philip J. Kelleher" <pjk1939@...ux.vnet.ibm.com>
To:	axboe@...nel.dk
Cc:	linux-kernel@...r.kernel.org, brking@...ux.vnet.ibm.com
Subject: [PATCH 7/11] rsxx: Fixes DLPAR add kernel panic if partition still
 mounted.

From: Philip J Kelleher <pjk1939@...ux.vnet.ibm.com>

A kernel panic would occur on a DLPAR add if there was a partition
still mounted during the DLPAR remove. This bug fix will allow the
user to unmount the partition and bring the driver back into a
good state after the DLPAR add.

Signed-off-by: Philip J Kelleher <pjk1939@...ux.vnet.ibm.com>
-------------------------------------------------------------------------------

diff -uprN -X linux-block-vanilla/Documentation/dontdiff linux-block-vanilla/drivers/block/rsxx/dev.c linux-block/drivers/block/rsxx/dev.c
--- linux-block-vanilla/drivers/block/rsxx/dev.c	2013-06-18 09:27:54.997977479 -0500
+++ linux-block/drivers/block/rsxx/dev.c	2013-06-18 09:38:35.997839384 -0500
@@ -171,6 +171,9 @@ static void rsxx_make_request(struct req

 	might_sleep();

+	if (!card)
+		goto req_err;
+
 	if (unlikely(card->halt)) {
 		st = -EFAULT;
 		goto req_err;
@@ -331,6 +334,7 @@ void rsxx_destroy_dev(struct rsxx_cardin
 	card->gendisk = NULL;

 	blk_cleanup_queue(card->queue);
+	card->queue->queuedata = NULL;
 	unregister_blkdev(card->major, DRIVER_NAME);
 }

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