linux-kernel - Re: [PATCH] pcmcia/electra_cf: Fix some return values in 'electra_cf

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Date:   Wed, 17 Jun 2020 22:27:55 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Olof Johansson <olof@...om.net>
Cc:     Dominik Brodowski <linux@...inikbrodowski.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Christoph Hellwig <hch@....de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] pcmcia/electra_cf: Fix some return values in
 'electra_cf_probe()' in case of error

Le 17/06/2020 à 22:10, Olof Johansson a écrit :
> On Wed, Jun 17, 2020 at 12:54 PM Christophe JAILLET
> <christophe.jaillet@...adoo.fr> wrote:
>> 'status' is known to be 0 at this point. It must be set to a meaningful
>> value in order to return an error code if one of the 'of_get_property()'
>> call fails.
>>
>> Return -EINVAL in such a case.
>>
>> Fixes: 2b571a066a2f("pcmcia: CompactFlash driver for PA Semi Electra boards")
>> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
>> ---
>>   drivers/pcmcia/electra_cf.c | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/pcmcia/electra_cf.c b/drivers/pcmcia/electra_cf.c
>> index 35158cfd9c1a..40a5cffe24a4 100644
>> --- a/drivers/pcmcia/electra_cf.c
>> +++ b/drivers/pcmcia/electra_cf.c
>> @@ -229,6 +229,8 @@ static int electra_cf_probe(struct platform_device *ofdev)
>>
>>          cf->socket.pci_irq = cf->irq;
>>
>> +       status = -EINVAL;
>> +
>>          prop = of_get_property(np, "card-detect-gpio", NULL);
>>          if (!prop)
>>                  goto fail1;
> The pcmcia_register_socket() call site sets status explicitly before
> jumping to fail1, which is a bit clearer.

Agreed, but as as you say below, this is not the most active driver in 
the kernel and PCMCIA, well, does anyone still uses it?

> Still, this is a legacy driver, I'm not sure there are any active
> users of it these days, and surely nobody that's tinkering around and
> editing the device tree (it comes from CFE on these systems, not from
> a .dts in the kernel tree). The fix isn't invalid, but it's also not
> likely to be an issue in the real world. So, let's just say:

In fact this patch has been in my tree for years, because the driver is 
mostly untouched and certainly used by no one, nowadays.
However, 2 weeks ago, commit b274014c6d19 made me think of a revived 
interest.
So I decided to post the patch, just in case.

> Acked-by: Olof Johansson <olof@...om.net>
>
>
> -Olof
>