[SCSI] save command pool address of Scsi_Host

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@suse.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Fixes: aebdf99b1697ca94d97f8583f500c73e958f999b
Cc: stable@vger.kernel.org
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index df3306019a7eeaf2009411ba0328dc7450fc6034..d81f3cc43ff1d3e834fcb6d2dc6460810d167ee8 100644 (file)
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -377,6 +377,10 @@ scsi_alloc_host_cmd_pool(struct Scsi_Host *shost)
                pool->slab_flags |= SLAB_CACHE_DMA;
                pool->gfp_mask = __GFP_DMA;
        }
+
+       if (hostt->cmd_size)
+               hostt->cmd_pool = pool;
+
        return pool;
 }
 
@@ -421,8 +425,10 @@ 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;
 }
 
@@ -444,8 +450,10 @@ static void scsi_put_host_cmd_pool(struct Scsi_Host *shost)
        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);
 }