This is a note to let you know that I've just added the patch titled
SCSI: save command pool address of Scsi_Host
to the 3.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
scsi-save-command-pool-address-of-scsi_host.patch
and it can be found in the queue-3.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From f6105c0808880c2c432b79bc81b37cc244c300c8 Mon Sep 17 00:00:00 2001
From: Juergen Gross <[email protected]>
Date: Mon, 4 Aug 2014 13:30:02 +0200
Subject: SCSI: save command pool address of Scsi_Host
From: Juergen Gross <[email protected]>
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 <[email protected]>
Reviewed-by: Hannes Reinecke <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
Fixes: 89d9a567952baec13e26ada3e438f1b642d66b6e
Signed-off-by: James Bottomley <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
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);
}
Patches currently in stable-queue which might be from [email protected] are
queue-3.16/scsi-save-command-pool-address-of-scsi_host.patch
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