linux-kernel - Re: [PATCH] fix bogus use of rc = alloc_chrdev

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Message-ID: <BANLkTi=8bv54-Z=xCyqUhFAnxM5G40k2WQ@mail.gmail.com>
Date:	Fri, 10 Jun 2011 14:29:42 -0600
From:	Jim Cromie <jim.cromie@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	rpjday@...shcourse.ca, greg@...ah.com
Subject: Re: [PATCH] fix bogus use of rc = alloc_chrdev_region()

can someone pick this up,
for this release or next ?

On Thu, Jun 2, 2011 at 11:38 PM, Jim Cromie <jim.cromie@...il.com> wrote:
> Robert P.J. Day noticed a bogus assignment: major = rc, after
> the call to alloc_chrdev_region() in pc8736x_gpio_init().
>
> The code as written expects return-code behavior as for
> register_chrdev(), ie on success: rc = reserved-major when
> requested-major = 0.  But for alloc_chrdev_region(), this isnt the
> case.  Since its used for debug printing only, just excise the mess.
>
> Signed-of-by: Jim Cromie <jim.cromie@...il.com>
> Reported-by: Robert P.J. Day <rpjday@...shcourse.ca>
> cc: Greg KH <greg@...ah.com.
> Signed-off-by: Jim Cromie <jim.cromie@...il.com>
> ---
>  drivers/char/pc8736x_gpio.c |    5 +----
>  1 files changed, 1 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/char/pc8736x_gpio.c b/drivers/char/pc8736x_gpio.c
> index b304ec0..30d92fe 100644
> --- a/drivers/char/pc8736x_gpio.c
> +++ b/drivers/char/pc8736x_gpio.c
> @@ -314,10 +314,7 @@ static int __init pc8736x_gpio_init(void)
>                dev_err(&pdev->dev, "register-chrdev failed: %d\n", rc);
>                goto undo_request_region;
>        }
> -       if (!major) {
> -               major = rc;
> -               dev_dbg(&pdev->dev, "got dynamic major %d\n", major);
> -       }
> +       dev_dbg(&pdev->dev, "using chardev major %d\n", major);
>
>        pc8736x_init_shadow();
>
> --
> 1.7.4.2
>
>
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