hi Greg,
2010/6/15 Greg KH <greg@xxxxxxxxx>:
> On Tue, Jun 08, 2010 at 03:29:23PM +0800, Axel Lin wrote:
>> In current implemtation, the "data" is not kfreed in qcprobe error path.
>> This patch moves the memory allocation a little bit latter and only
>> allocate memory when no error is detected in previous checking.
>
> Yeah, but it's now pretty messy.
>
>> --- a/drivers/usb/serial/qcserial.c
>> +++ b/drivers/usb/serial/qcserial.c
>> @@ -109,13 +109,6 @@ static int qcprobe(struct usb_serial *serial, const struct usb_device_id *id)
>> ifnum = intf->desc.bInterfaceNumber;
>> dbg("This Interface = %d", ifnum);
>>
>> - data = serial->private = kzalloc(sizeof(struct usb_wwan_intf_private),
>> - GFP_KERNEL);
>> - if (!data)
>> - return -ENOMEM;
>> -
>> - spin_lock_init(&data->susp_lock);
>> -
>
> Moving this to the end is fine.
>
>> @@ -140,7 +135,7 @@ static int qcprobe(struct usb_serial *serial, const struct usb_device_id *id)
>> retval);
>> retval = -ENODEV;
>> }
>> - return retval;
>> + goto out;
>
> But this doesn't need to be changed, right?
> Or this.
>
>> }
>> break;
>>
>> @@ -156,17 +151,26 @@ static int qcprobe(struct usb_serial *serial, const struct usb_device_id *id)
>> retval);
>> retval = -ENODEV;
>> }
>> - return retval;
>> + goto out;
>
> Or this?
>
>> }
>> break;
>>
>> default:
>> dev_err(&serial->dev->dev,
>> "unknown number of interfaces: %d\n", nintf);
>> - return -ENODEV;
>
> Hm. maybe.
>
>> }
>>
>> - return retval;
>> +out:
>> + if (retval)
>> + return retval;
>> +
>> + data = serial->private = kzalloc(sizeof(struct usb_wwan_intf_private),
>> + GFP_KERNEL);
>> + if (!data)
>> + return -ENOMEM;
>> +
>> + spin_lock_init(&data->susp_lock);
>> + return 0;
>
> I guess it's ok, I just don't like doing data initialization on the
> "out" path, it's messy.
>
> Care to neaten this up a bit more and resend it? Perhaps just free the
> memory on the error path instead of moving it later on?
I will send a revised patch that just free the memory on the error path.
Thanks for the review.
Axel
>
> thanks,
>
> greg k-h
>
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