netdev - Re: [PATCH] ath10k: Fix qmi init error handling

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Date:   Wed, 13 Nov 2019 08:11:41 -0700
From:   Jeffrey Hugo <jeffrey.l.hugo@...il.com>
To:     Kalle Valo <kvalo@...eaurora.org>
Cc:     Simon Horman <simon.horman@...ronome.com>, davem@...emloft.net,
        ath10k@...ts.infradead.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, MSM <linux-arm-msm@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ath10k: Fix qmi init error handling

On Tue, Nov 12, 2019 at 9:57 PM Kalle Valo <kvalo@...eaurora.org> wrote:
>
> Jeffrey Hugo <jeffrey.l.hugo@...il.com> writes:
>
> > On Tue, Nov 12, 2019 at 1:42 AM Simon Horman <simon.horman@...ronome.com> wrote:
> >>
> >> On Wed, Nov 06, 2019 at 03:16:50PM -0800, Jeffrey Hugo wrote:
> >> > When ath10k_qmi_init() fails, the error handling does not free the irq
> >> > resources, which causes an issue if we EPROBE_DEFER as we'll attempt to
> >> > (re-)register irqs which are already registered.
> >> >
> >> > Fixes: ba94c753ccb4 ("ath10k: add QMI message handshake for wcn3990 client")
> >> > Signed-off-by: Jeffrey Hugo <jeffrey.l.hugo@...il.com>
> >> > ---
> >> >  drivers/net/wireless/ath/ath10k/snoc.c | 2 +-
> >> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >> >
> >> > diff --git a/drivers/net/wireless/ath/ath10k/snoc.c b/drivers/net/wireless/ath/ath10k/snoc.c
> >> > index fc15a0037f0e..f2a0b7aaad3b 100644
> >> > --- a/drivers/net/wireless/ath/ath10k/snoc.c
> >> > +++ b/drivers/net/wireless/ath/ath10k/snoc.c
> >> > @@ -1729,7 +1729,7 @@ static int ath10k_snoc_probe(struct platform_device *pdev)
> >> >       ret = ath10k_qmi_init(ar, msa_size);
> >> >       if (ret) {
> >> >               ath10k_warn(ar, "failed to register wlfw qmi client: %d\n", ret);
> >> > -             goto err_core_destroy;
> >> > +             goto err_free_irq;
> >> >       }
> >>
> >> From a casual examination of the code this seems like a step in the right
> >> direction. But does this error path also need to call ath10k_hw_power_off() ?
> >
> > It probably should.  I don't see any fatal errors from the step being
> > skipped, although it might silence some regulator warnings about being
> > left on.  Unlikely to be observed by most folks as I was initing the
> > driver pretty early to debug some things.  Looks like Kalle already
> > picked up this patch though, so I guess your suggestion would need to
> > be a follow up.
>
> Actually it's only in the pending branch, which means that the patch can
> be changed or a new version can be submitted:

Thats an interesting flow.  Ok.

>
> https://wireless.wiki.kernel.org/en/users/drivers/ath10k/submittingpatches#patch_flow
>
> The easiest way to check the state of a wireless patch is from
> patchwork:
>
> https://patchwork.kernel.org/patch/11231325/
>
> https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches#checking_state_of_patches_from_patchwork
>
> --
> https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches