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Date: Fri, 28 Jul 2023 21:05:55 +0530
From: Manivannan Sadhasivam <mani@kernel.org>
To: Dan Carpenter <dan.carpenter@linaro.org>
Cc: Krishna chaitanya chundru <quic_krichai@quicinc.com>,
	manivannan.sadhasivam@linaro.org, helgaas@kernel.org,
	linux-pci@vger.kernel.org, linux-arm-msm@vger.kernel.org,
	linux-kernel@vger.kernel.org, quic_vbadigan@quicinc.com,
	quic_nitegupt@quicinc.com, quic_skananth@quicinc.com,
	quic_ramkri@quicinc.com, krzysztof.kozlowski@linaro.org,
	Jeffrey Hugo <quic_jhugo@quicinc.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Dan Carpenter <error27@gmail.com>,
	"Rafael J. Wysocki" <rafael@kernel.org>,
	"open list:MHI BUS" <mhi@lists.linux.dev>
Subject: Re: [PATCH v4 9/9] bus: mhi: ep: wake up host if the MHI state is in
 M3
Message-ID: <20230728153555.GA9129@thinkpad>
References: <1689232218-28265-1-git-send-email-quic_krichai@quicinc.com>
 <1689232218-28265-10-git-send-email-quic_krichai@quicinc.com>
 <20230728043452.GI4433@thinkpad>
 <15a19a2d-d6e8-4fbc-a31d-561cff00b01a@kadam.mountain>
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In-Reply-To: <15a19a2d-d6e8-4fbc-a31d-561cff00b01a@kadam.mountain>

On Fri, Jul 28, 2023 at 08:50:55AM +0300, Dan Carpenter wrote:
> On Fri, Jul 28, 2023 at 10:04:52AM +0530, Manivannan Sadhasivam wrote:
> > > @@ -464,6 +484,13 @@ int mhi_ep_queue_skb(struct mhi_ep_device *mhi_dev, struct sk_buff *skb)
> > >  	buf_left = skb->len;
> > >  	ring = &mhi_cntrl->mhi_chan[mhi_chan->chan].ring;
> > >  
> > > +	if (mhi_cntrl->mhi_state == MHI_STATE_M3) {
> > > +		if (mhi_ep_wake_host(mhi_cntrl)) {
> > 
> > Don't you need lock here in the case of multiple queue requests?
> > 
> > - Mani
> > 
> > > +			dev_err(dev, "Failed to wakeup host\n");
> > > +			return -ENODEV;
> > > +		}
> > > +	}
> > > +
> > >  	mutex_lock(&mhi_chan->lock);
>         ^^^^^^^^^^^^^^^^^^^^^^^^^^
> This lock isn't enough?
> 

The position of this lock won't prevent cocurrent access to mhi_ep_wake_host().

- Mani

> regards,
> dan carpenter

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