linux-kernel - Re: [PATCH] staging/sbe-2t3e3: error path cleanup in t3e3_init

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Date:	Thu, 19 Jul 2012 15:50:38 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Devendra Naga <devendra.aaru@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging/sbe-2t3e3: error path cleanup in
 t3e3_init_channel

Cleanup means there are no behavior changes.  This is a bug fix.

On Thu, Jul 19, 2012 at 06:00:01PM +0530, Devendra Naga wrote:
>     a) if alloc_hdlcdev fails, we are going into the free_regions,
> and returning out the err (which is 0 by the prev call),
>        return -ENOMEM if this function fail.
> 
>     b) setup_device also can fail, as it calls around the register_hdlc_dev which
> is again a macro of the register_netdev.
> 
>        take the error from the setup_device and return it out in error condition
> 
>     c) request_irq when fails, we are freeing requested mem regions and disabling
> the pci device(?) and returning err which is agian 0 here.
> 
>       take the error from request_irq and err path will take care of returning it.
> 
> as if we return 0 , at the init function, t3e3_init_card, we have a success case
> and if there are two channels we call this function again, having the result of
> it completely unknown.
> 
> This result in having the probe return 0, unloading the driver may (not) cause
> ambigous result.

These bugs were there before your patch, but we should also be doing
an unregister_hdlc_device() and a free_netdev().

regards,
dan carpenter

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