linux-kernel - Re: [PATCH] bus: mhi: core: Use current ee in intvec handler for syserr

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Date:   Tue, 16 Feb 2021 09:36:05 -0800
From:   Bhaumik Bhatt <bbhatt@...eaurora.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     Jeffrey Hugo <jhugo@...eaurora.org>, hemantk@...eaurora.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bus: mhi: core: Use current ee in intvec handler for
 syserr

On 2021-02-15 11:32 PM, Manivannan Sadhasivam wrote:
> On Fri, Feb 12, 2021 at 05:40:14PM -0700, Jeffrey Hugo wrote:
>> The intvec handler stores the caches ee in a local variable for use in
>> processing the intvec.  When determining if a syserr is a fatal error 
>> or
>> not, the intvec handler is using the cached version, when it should be
>> using the current ee read from the device.  Currently, the device 
>> could
>> be in the PBL ee as the result of a fatal error, but the cached ee 
>> might
>> be AMSS, which would cause the intvec handler to incorrectly signal a
>> non-fatal syserr.
>> 
>> Fixes: 3000f85b8f47 ("bus: mhi: core: Add support for basic PM 
>> operations")
>> Signed-off-by: Jeffrey Hugo <jhugo@...eaurora.org>
> 
> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> 
> Thanks,
> Mani
> 
>> ---
>>  drivers/bus/mhi/core/main.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>> 
>> diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c
>> index 4e0131b..f182736 100644
>> --- a/drivers/bus/mhi/core/main.c
>> +++ b/drivers/bus/mhi/core/main.c
>> @@ -448,7 +448,7 @@ irqreturn_t mhi_intvec_threaded_handler(int 
>> irq_number, void *priv)
>>  		wake_up_all(&mhi_cntrl->state_event);
>> 
>>  		/* For fatal errors, we let controller decide next step */
>> -		if (MHI_IN_PBL(ee))
>> +		if (MHI_IN_PBL(mhi_cntrl->ee))
>>  			mhi_cntrl->status_cb(mhi_cntrl, MHI_CB_FATAL_ERROR);
>>  		else
>>  			mhi_pm_sys_err_handler(mhi_cntrl);
>> --
>> Qualcomm Technologies, Inc. is a member of the
>> Code Aurora Forum, a Linux Foundation Collaborative Project.
>> 

This was being fixed by my patch series for execution environment.

I should just send the most important of my patches as one line fixers 
from now on.

Thanks,
Bhaumik
---
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora 
Forum,
a Linux Foundation Collaborative Project