linux-kernel - Re: [PATCH] i2c: thunderx: Fix some resource leak

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Date:   Tue, 19 Oct 2021 19:29:33 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Robert Richter <rric@...nel.org>
Cc:     jan.glauber@...il.com, wsa@...nel.org, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] i2c: thunderx: Fix some resource leak

Le 18/10/2021 à 23:15, Robert Richter a écrit :
> On 16.10.21 10:48:26, Christophe JAILLET wrote:
>> We need to undo a 'pci_request_regions()' call in the error handling path
>> of the probe function and in the remove function.
> 
> Isn't that devm and thus not needed?

My bad, you are obviously right, sorry for the noise.

I was aware that 'pcim_enable_device()' was turning automagically 
'pci_alloc_irq_vectors()' into a managed function. But I wasn't for 
'pci_request_regions()'. Now I'm :)

CJ

> 
>>
>> Fixes: 22d40209de3b ("i2c: thunderx: Add i2c driver for ThunderX SOC")
>> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
>> ---
>>   drivers/i2c/busses/i2c-thunderx-pcidrv.c | 9 +++++++--
>>   1 file changed, 7 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/i2c/busses/i2c-thunderx-pcidrv.c b/drivers/i2c/busses/i2c-thunderx-pcidrv.c
>> index 12c90aa0900e..2d37096a6968 100644
>> --- a/drivers/i2c/busses/i2c-thunderx-pcidrv.c
>> +++ b/drivers/i2c/busses/i2c-thunderx-pcidrv.c
>> @@ -177,8 +177,10 @@ static int thunder_i2c_probe_pci(struct pci_dev *pdev,
>>   		return ret;
>>   
> 
> There is a pcim_enable_device() call before all that, so the regions
> should be removed on device release, see pcim_release().
> 
> -Robert
> 
>>   	i2c->twsi_base = pcim_iomap(pdev, 0, pci_resource_len(pdev, 0));
>> -	if (!i2c->twsi_base)
>> -		return -EINVAL;
>> +	if (!i2c->twsi_base) {
>> +		ret = -EINVAL;
>> +		goto err_release_regions;
>> +	}
>>   
>>   	thunder_i2c_clock_enable(dev, i2c);
>>   	ret = device_property_read_u32(dev, "clock-frequency", &i2c->twsi_freq);
>> @@ -231,6 +233,8 @@ static int thunder_i2c_probe_pci(struct pci_dev *pdev,
>>   
>>   error:
>>   	thunder_i2c_clock_disable(dev, i2c->clk);
>> +err_release_regions:
>> +	pci_release_regions(pdev);
>>   	return ret;
>>   }
>>   
>> @@ -241,6 +245,7 @@ static void thunder_i2c_remove_pci(struct pci_dev *pdev)
>>   	thunder_i2c_smbus_remove(i2c);
>>   	thunder_i2c_clock_disable(&pdev->dev, i2c->clk);
>>   	i2c_del_adapter(&i2c->adap);
>> +	pci_release_regions(pdev);
>>   }
>>   
>>   static const struct pci_device_id thunder_i2c_pci_id_table[] = {
>> -- 
>> 2.30.2
>>
>