Re: [PATCH 2/3] target: close target_put_sess_cmd() vs.core_tmr_abort_task() race v5

From: Greg Kroah-Hartman
Date: Tue May 14 2013 - 15:04:44 EST


On Mon, May 13, 2013 at 04:30:06PM -0400, Joern Engel wrote:
> It is possible for one thread to to take se_sess->sess_cmd_lock in
> core_tmr_abort_task() before taking a reference count on
> se_cmd->cmd_kref, while another thread in target_put_sess_cmd() drops
> se_cmd->cmd_kref before taking se_sess->sess_cmd_lock.
>
> This introduces kref_put_spinlock_irqsave() and uses it in
> target_put_sess_cmd() to close the race window.
>
> Signed-off-by: Joern Engel <joern@xxxxxxxxx>

For the kref.h part, please feel free to add:

Acked-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
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