linux-kernel - Re: [RFC PATCH 03/57] drivers: coresight: Drop device references found via bus_find

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Message-ID: <e009a16e-a1bd-a8c3-34da-cc532a40be41@arm.com>
Date:   Tue, 4 Jun 2019 09:19:54 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, rafael@...nel.org,
        mathieu.poirier@...aro.org
Subject: Re: [RFC PATCH 03/57] drivers: coresight: Drop device references
 found via bus_find_device



On 03/06/2019 20:08, Greg KH wrote:
> On Mon, Jun 03, 2019 at 04:49:29PM +0100, Suzuki K Poulose wrote:
>> We must drop references to the device found via bus_find_device().
>>
>> Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
>> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
>> ---
>>   drivers/hwtracing/coresight/coresight.c | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
>> index 4b13028..37ccd67 100644
>> --- a/drivers/hwtracing/coresight/coresight.c
>> +++ b/drivers/hwtracing/coresight/coresight.c
>> @@ -540,7 +540,7 @@ struct coresight_device *coresight_get_enabled_sink(bool deactivate)
>>   
>>   	dev = bus_find_device(&coresight_bustype, NULL, &deactivate,
>>   			      coresight_enabled_sink);
>> -
>> +	put_device(dev);
>>   	return dev ? to_coresight_device(dev) : NULL;
> 
> You drop the reference and then use the pointer?
> 
> Not good :(
> 
>>   }
>>   
>> @@ -581,7 +581,7 @@ struct coresight_device *coresight_get_sink_by_id(u32 id)
>>   
>>   	dev = bus_find_device(&coresight_bustype, NULL, &id,
>>   			      coresight_sink_by_id);
>> -
>> +	put_device(dev);
>>   	return dev ? to_coresight_device(dev) : NULL;
> 
> Same here, not good :(
> 
> Please fix this up and it can go in as a bugfix like any other normal
> patch, outside of this huge series.
> 
> thanks,
> 

Sure, will do. I think there are much more of such instances lying around. :-(
I will take it out of this series.

Thanks
Suzuki