linux-kernel - Re: [PATCH] [media] staging: Return -EINTR in s2250

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Date:	Fri, 16 Mar 2012 22:26:20 +0530
From:	santosh prasad nayak <santoshprasadnayak@...il.com>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	mchehab@...radead.org, gregkh@...uxfoundation.org,
	khoroshilov@...ras.ru, linux-media@...r.kernel.org,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] [media] staging: Return -EINTR in s2250_probe() if fails
 to get lock.

On Fri, Mar 16, 2012 at 10:02 PM, Oliver Neukum <oliver@...kum.org> wrote:
> Am Freitag, 16. März 2012, 17:23:58 schrieb santosh nayak:
>> From: Santosh Nayak <santoshprasadnayak@...il.com>
>>
>> In s2250_probe(), If locking attempt is interrupted by a signal then
>> it should return -EINTR after unregistering audio device and making free
>> the allocated memory.
>>
>> At present, if locking is interrupted by signal it will display message
>> "initialized successfully" and return success.  This is wrong.
>
> Indeed there's a lot wrong here. The idea of having an interruptible
> sleep in probe() is arcane. You need a very, very, very good reason for that.

Can you please explain why interruptible  sleep  should not be  in probe() ?
I am curious to know.


> The sane fix is using an uninterruptable sleep here.
>
> Second, while you are at it, fix the error case for no initialization
> due to a failing kmalloc(). You need to return -ENOMEM.

Are you talking about kmalloc or kzalloc ?
Because for failing kmalloc -ENOMEM is returned as shown below:

       state = kmalloc(sizeof(struct s2250), GFP_KERNEL);
        if (state == NULL) {
                i2c_unregister_device(audio);
                return -ENOMEM;     // ENOMEM is returned here.
        }


Regards
Santosh


>
>        Regards
>                Oliver
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