linux-kernel - Re: [PATCH 1/2] bus: mhi: host: Remove duplicate ee check for syserr

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Date:   Mon, 3 Apr 2023 11:15:31 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Jeffrey Hugo <quic_jhugo@...cinc.com>
Cc:     mhi@...ts.linux.dev, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] bus: mhi: host: Remove duplicate ee check for syserr

On Mon, Apr 03, 2023 at 11:07:35AM +0530, Manivannan Sadhasivam wrote:
> On Tue, Jan 24, 2023 at 02:57:23PM -0700, Jeffrey Hugo wrote:
> > If we detect a system error via intvec, we only process the syserr if the
> > current ee is different than the last observed ee.  The reason for this
> > check is to prevent bhie from running multiple times, but with the single
> > queue handling syserr, that is not possible.
> > 
> > The check can cause an issue with device recovery.  If PBL loads a bad SBL
> > via BHI, but that SBL hangs before notifying the host of an ee change,
> > then issuing soc_reset to crash the device and retry (after supplying a
> > fixed SBL) will not recover the device as the host will observe a PBL->PBL
> > transition and not process the syserr.  The device will be stuck until
> > either the driver is reloaded, or the host is rebooted.  Instead, remove
> > the check so that we can attempt to recover the device.
> > 
> > Signed-off-by: Jeffrey Hugo <quic_jhugo@...cinc.com>
> 
> Reviewed-by: Manivannan Sadhasivam <mani@...nel.org>
> 

Forgot to add that, this patch also needs a fixes tag and backporting.

- Mani

> - Mani
> 
> > Reviewed-by: Carl Vanderlip <quic_carlv@...cinc.com>
> > ---
> >  drivers/bus/mhi/host/main.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/bus/mhi/host/main.c b/drivers/bus/mhi/host/main.c
> > index df0fbfe..0c3a009 100644
> > --- a/drivers/bus/mhi/host/main.c
> > +++ b/drivers/bus/mhi/host/main.c
> > @@ -503,7 +503,7 @@ irqreturn_t mhi_intvec_threaded_handler(int irq_number, void *priv)
> >  	}
> >  	write_unlock_irq(&mhi_cntrl->pm_lock);
> >  
> > -	if (pm_state != MHI_PM_SYS_ERR_DETECT || ee == mhi_cntrl->ee)
> > +	if (pm_state != MHI_PM_SYS_ERR_DETECT)
> >  		goto exit_intvec;
> >  
> >  	switch (ee) {
> > -- 
> > 2.7.4
> > 
> 
> -- 
> மணிவண்ணன் சதாசிவம்

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