[PATCH v2] ata: fixes kernel crash while tracing ata_eh_link_autopsy event

[Tejun Heo]

On Thu, Nov 02, 2017 at 04:31:07PM +0530, Rameshwar Prasad Sahu wrote:
> When tracing ata link error event, the kernel crashes when the disk is
> removed due to NULL pointer access by trace_ata_eh_link_autopsy API.
> This occurs as the dev is NULL when the disk disappeared. This patch
> fixes this crash by calling trace_ata_eh_link_autopsy only if "dev"
> is not NULL.
> 
> v2 changes:
>  Removed direct passing "link" pointer instead of "dev" in trace API.
> 
> Signed-off-by: Rameshwar Prasad Sahu <rsahu at apm.com>

Applied to libata/for-4.15.

Thanks.

-- 
tejun