linux-kernel - Re: [PATCH v2] staging: r8188eu: handle rtw_init_netdev

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Date:   Mon, 24 Jan 2022 14:46:19 +0530
From:   Vihas Mak <makvihas@...il.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Larry Finger <Larry.Finger@...inger.net>,
        Phillip Potter <phil@...lpotter.co.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michael Straube <straube.linux@...il.com>,
        Martin Kaiser <martin@...ser.cx>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] staging: r8188eu: handle rtw_init_netdev_name()
 failure appropriately

Thanks for reviewing the patch Dan.

>> TODO: re-write probe error handling

Will submit a series of patches in upcoming days, based on the steps
you provided.

On Mon, Jan 24, 2022 at 12:19 PM Dan Carpenter <dan.carpenter@...cle.com> wrote:
>
> On Sun, Jan 23, 2022 at 11:47:35PM +0530, Vihas Mak wrote:
> > rtw_init_netdev_name() calls dev_alloc_name() which allocates the name
> > for the device as per the given name format.
> > The name format is specified by the module parameter "ifname".
> > It returns a negative err code if the format is invalid. Handle this
> > error appropriately.
> > Cancel the timers ininitliazed by rtw_init_drv_sw() before calling
> > rtw_free_drv_sw() and then proceed to free the adapter.
> >
> > Also, if register_netdev() fails then goto free_drv_sw instead of
> > goto handle_dualmac.
> >
> > Signed-off-by: Vihas Mak <makvihas@...il.com>
> > ---
> > v1->v2:
> >     free the adapter and netdev instead of warning the user about
> >     allocation failure.
>
> Thanks!
>
> Reviewed-by: Dan Carpenter <dan.carpenter@...cle.com>
>
> Of course, all this code is staging code and terrible.  This function
> is needlessly difficult to read/review.
>
> TODO: re-write probe error handling
>
> Step 1: Keep the success path and error path separate.
>
> -       status = _SUCCESS;
> +       return padapter;
>
> Step 2: Eliminate do-nothing-gotos.  s/goto exit/return NULL/
>
> Step 3: Delete the vfree(pnpi->priv); from rtw_free_netdev() and call
>         vfree(pnpi->priv); from probe and rtw_usb_if1_deinit() instead.
>         Avoid a layering violation.
>
> Step 4: Every allocation function needs a matching free function.  Move
>         the rtw_cancel_all_timer() into the rtw_free_drv_sw() function.
>         Open coding it is a layering violation.
>
> Step 5: Get rid of the rtw_handle_dualmac() function.  It has a bad
>         name and a global variable.  What is the point of this function?
>
> But that stuff is for later patches.
>
> regards,
> dan carpenter
>


-- 
Thanks,
Vihas