Re: [PATCH v4 9/9] bus: mhi: ep: wake up host if the MHI state is in M3

[Manivannan Sadhasivam <mani@kernel.org>]

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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