linux-kernel - Re: [PATCH 2/3] bus: mhi: core: Make sure to powerdown if mhi_sync_power

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Message-ID: <18dbd05b-63cf-0494-b20c-90a96626ceeb@codeaurora.org>
Date:   Tue, 7 Apr 2020 09:04:15 -0600
From:   Jeffrey Hugo <jhugo@...eaurora.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     hemantk@...eaurora.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] bus: mhi: core: Make sure to powerdown if
 mhi_sync_power_up fails

On 4/7/2020 12:14 AM, Manivannan Sadhasivam wrote:
> On Mon, Apr 06, 2020 at 03:04:36PM -0600, Jeffrey Hugo wrote:
>> Powerdown is necessary if mhi_sync_power_up fails due to a timeout, to
>> clean up the resources.  Otherwise a BUG could be triggered when
>> attempting to clean up MSIs because the IRQ is still active from a
>> request_irq().
>>
>> Signed-off-by: Jeffrey Hugo <jhugo@...eaurora.org>
>> ---
>>   drivers/bus/mhi/core/pm.c | 6 +++++-
>>   1 file changed, 5 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
>> index cd6ba23..1bfa334 100644
>> --- a/drivers/bus/mhi/core/pm.c
>> +++ b/drivers/bus/mhi/core/pm.c
>> @@ -922,7 +922,11 @@ int mhi_sync_power_up(struct mhi_controller *mhi_cntrl)
>>   			   MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state),
>>   			   msecs_to_jiffies(mhi_cntrl->timeout_ms));
>>   
>> -	return (MHI_IN_MISSION_MODE(mhi_cntrl->ee)) ? 0 : -EIO;
>> +	ret = (MHI_IN_MISSION_MODE(mhi_cntrl->ee)) ? 0 : -EIO;
>> +
>> +	if (ret)
>> +		mhi_power_down(mhi_cntrl, false);
>> +	return ret;
> 
> I'd prefer the style of,
> 
> ```
> statement
> if (cond)
> 	statement
> 
> return
> ```
> 
> Please stick to this. The change itself looks good.
> 

Sure, will do.


-- 
Jeffrey Hugo
Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.