Re: [PATCH] crypto: qat - Fix missing destroy_workqueue in adf_init_aer()

["Cabiddu, Giovanni" <giovanni.cabiddu@intel.com>]

On Fri, Oct 25, 2024 at 09:24:52AM +0800, Wang Hai wrote:
> 
> 
> On 2024/10/24 23:04, Cabiddu, Giovanni wrote:
> > On Thu, Oct 24, 2024 at 10:00:57PM +0800, Wang Hai wrote:
> > > The adf_init_aer() won't destroy device_reset_wq when alloc_workqueue()
> > > for device_sriov_wq failed. Add destroy_workqueue for device_reset_wq to
> > > fix this issue.
> > > 
> > > Fixes: 4469f9b23468 ("crypto: qat - re-enable sriov after pf reset")
> > > Signed-off-by: Wang Hai <wanghai38@huawei.com>
> > > ---
> > >   drivers/crypto/intel/qat/qat_common/adf_aer.c | 4 +++-
> > >   1 file changed, 3 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/crypto/intel/qat/qat_common/adf_aer.c b/drivers/crypto/intel/qat/qat_common/adf_aer.c
> > > index ec7913ab00a2..907144ec7e65 100644
> > > --- a/drivers/crypto/intel/qat/qat_common/adf_aer.c
> > > +++ b/drivers/crypto/intel/qat/qat_common/adf_aer.c
> > > @@ -281,8 +281,10 @@ int adf_init_aer(void)
> > >   		return -EFAULT;
> > >   	device_sriov_wq = alloc_workqueue("qat_device_sriov_wq", 0, 0);
> > > -	if (!device_sriov_wq)
> > > +	if (!device_sriov_wq) {
> > > +		destroy_workqueue(device_reset_wq);
> > The missing destroy_workqueue() here is intentional as the device_reset_wq
> > is destroyed in adf_exit_aer() which is called if adf_init_aer() fails,
> > see [1].
> > 
> Hi, Giovanni.
> 
> Thanks for the review.
> 
> If adf_init_aer() fails, it will goto err_aer and then call
> adf_exit_misc_wq() instead of goto err_pf_wq and then call
> adf_exit_aer(). So this patch is needed.
Sorry, I overlooked it. You are right.
On the error path I would also set device_reset_wq to NULL.
	if (!device_sriov_wq) {
		destroy_workqueue(device_reset_wq);
		device_reset_wq = NULL;
		return -EFAULT;
	}

Regards,

-- 
Giovanni