[Xen-devel] [PATCH V4 4/4] Save command pool address of Scsi_Host

[jgross@xxxxxxxx]

From: Juergen Gross <jgross@xxxxxxxx>

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

diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 88d46fe..b0cef5b 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -380,6 +380,10 @@ 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;
 }
 
@@ -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(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);
 }
-- 
1.8.4.5


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