linux-kernel - Re: [PATCH 2/4] wcn36xx: Change indication list lock to spinlock

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Date:	Mon, 28 Dec 2015 20:25:10 -0800
From:	Bjorn Andersson <bjorn@...o.se>
To:	Stephen Hemminger <stephen@...workplumber.org>
Cc:	Eugene Krasnikov <k.eugene.e@...il.com>,
	Kalle Valo <kvalo@...eaurora.org>, fengwei.yin@...aro.org,
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	wcn36xx@...ts.infradead.org
Subject: Re: [PATCH 2/4] wcn36xx: Change indication list lock to spinlock

On Mon 28 Dec 15:06 PST 2015, Stephen Hemminger wrote:

> On Sun, 27 Dec 2015 17:34:25 -0800
> Bjorn Andersson <bjorn@...o.se> wrote:
> 
> > In preparation for handling incoming messages from IRQ context, change
> > the indication list lock to a spinlock
> > 
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@...ymobile.com>
> > ---
> >  drivers/net/wireless/ath/wcn36xx/smd.c     | 12 ++++++------
> >  drivers/net/wireless/ath/wcn36xx/wcn36xx.h |  2 +-
> >  2 files changed, 7 insertions(+), 7 deletions(-)
> > 
> > diff --git a/drivers/net/wireless/ath/wcn36xx/smd.c b/drivers/net/wireless/ath/wcn36xx/smd.c
> > index 6b5dbe6f0d0a..4307429740a9 100644
> > --- a/drivers/net/wireless/ath/wcn36xx/smd.c
> > +++ b/drivers/net/wireless/ath/wcn36xx/smd.c
> > @@ -2165,10 +2165,10 @@ static void wcn36xx_smd_rsp_process(struct wcn36xx *wcn, void *buf, size_t len)
> >  		msg_ind->msg_len = len;
> >  		memcpy(msg_ind->msg, buf, len);
> >  
> > -		mutex_lock(&wcn->hal_ind_mutex);
> > +		spin_lock(&wcn->hal_ind_lock);
> 
> If you are going to handle messages in IRQ context, that better be a
> spin_lock_irq() or spin_lock_bh().

This function is executed in IRQ context after the next patch, as such I
use spin_lock() here and spin_lock_irqsave() in the worker thread
(wcn36xx_ind_smd_work()).

Is this not how the spin_lock API should be used?

Regards,
Bjorn
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