linux-kernel - [PATCH 3.16 058/158] SCSI: save command pool address of Scsi

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Date:	Mon, 15 Sep 2014 12:24:57 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Juergen Gross <jgross@...e.com>,
	Hannes Reinecke <hare@...e.de>, Christoph Hellwig <hch@....de>,
	James Bottomley <JBottomley@...allels.com>
Subject: [PATCH 3.16 058/158] SCSI: save command pool address of Scsi_Host

3.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Juergen Gross <jgross@...e.com>

commit f6105c0808880c2c432b79bc81b37cc244c300c8 upstream.

If a scsi host driver specifies .cmd_len in it's scsi_host_template, a driver's
private command pool is needed. scsi_find_host_cmd_pool() will locate it, but
scsi_alloc_host_cmd_pool() isn't saving the pool address in the host template.

This will result in an access error when the host is removed.

Avoid the problem by saving the address of a new allocated command pool where
it is expected.

Signed-off-by: Juergen Gross <jgross@...e.com>
Reviewed-by: Hannes Reinecke <hare@...e.de>
Signed-off-by: Christoph Hellwig <hch@....de>
Fixes: 89d9a567952baec13e26ada3e438f1b642d66b6e
Signed-off-by: James Bottomley <JBottomley@...allels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/scsi.c |   12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -380,6 +380,10 @@ scsi_alloc_host_cmd_pool(struct Scsi_Hos
 		pool->slab_flags |= SLAB_CACHE_DMA;
 		pool->gfp_mask = __GFP_DMA;
 	}
+
+	if (hostt->cmd_size)
+		hostt->cmd_pool = pool;
+
 	return pool;
 }
 
@@ -424,8 +428,10 @@ out:
 out_free_slab:
 	kmem_cache_destroy(pool->cmd_slab);
 out_free_pool:
-	if (hostt->cmd_size)
+	if (hostt->cmd_size) {
 		scsi_free_host_cmd_pool(pool);
+		hostt->cmd_pool = NULL;
+	}
 	goto out;
 }
 
@@ -447,8 +453,10 @@ static void scsi_put_host_cmd_pool(struc
 	if (!--pool->users) {
 		kmem_cache_destroy(pool->cmd_slab);
 		kmem_cache_destroy(pool->sense_slab);
-		if (hostt->cmd_size)
+		if (hostt->cmd_size) {
 			scsi_free_host_cmd_pool(pool);
+			hostt->cmd_pool = NULL;
+		}
 	}
 	mutex_unlock(&host_cmd_pool_mutex);
 }


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