[PATCH v3] NVMe: eliminate potential deadlock bynvme_get_ns_from_disk invoking nvme_free_ns

[Christoph Hellwig]

On Thu, May 05, 2016 at 09:17:35AM +0800, Wang Sheng-Hui wrote:
> Release dev_list_lock before enter nvme_free_ns from
> nvme_get_ns_from_disk to avoid potential deadlock.
> 
> The change is finally made by Keith Busch, which
> improve v1/v2 version:
>     * Smaller change
>     * Fix the module reference drop issue in v2 version
>     * Remove gotos
> 
> Signed-off-by: Wang Sheng-Hui <shhuiw at foxmail.com>

Looks fine,

Reviewed-by: Christoph Hellwig <hch at lst.de>