Re: [PATCH] core/verb.c: fix kernel panic: always initialize struct ib_qp *qp->usecnt

[Greg KH <greg-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>]

On Thu, Jan 19, 2012 at 08:46:41PM +0100, Bernd Schubert wrote:
> We have just been investigating kernel panics related to
> cq->ibcq.event_handler() completion calls.
> 
> Reason is that ib_destroy_qp() fails with -EBUSY. Further investigation
> revealed qp->usecnt is not initialized. This counter was introduced
> in linux-3.2 by commit 0e0ec7e0638ef48e0c661873dfcc8caccab984c6
> and is only initialized for IB_QPT_XRC_TGT, but also checked in ib_destroy_qp()
> for any qp type.
> 
> Signed-off-by: Bernd Schubert <bernd.schubert-mPn0NPGs4xGatNDF+KUbs4QuADTiUCJX@public.gmane.org>
> Signed-off-by: Sven Breuner <sven.breuner-mPn0NPGs4xGatNDF+KUbs4QuADTiUCJX@public.gmane.org>
> ---
>  drivers/infiniband/core/verbs.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read Documentation/stable_kernel_rules.txt
for how to do this properly.

</formletter>
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