linux-kernel - Re: [PATCH AUTOSEL 5.1 17/59] fpga: dfl: expand minor range when registering chrdev region

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Message-ID: <20190615054806.GB23883@kroah.com>
Date:   Sat, 15 Jun 2019 07:48:06 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Chengguang Xu <cgxu519@....com>, Wu Hao <hao.wu@...el.com>,
        Alan Tull <atull@...nel.org>, linux-fpga@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 5.1 17/59] fpga: dfl: expand minor range when
 registering chrdev region

On Fri, Jun 14, 2019 at 04:28:01PM -0400, Sasha Levin wrote:
> From: Chengguang Xu <cgxu519@....com>
> 
> [ Upstream commit de9a7f6f5f1967d275311cca9163b4a3ffe9b0ae ]
> 
> Actually, total amount of available minor number
> for a single major is MINORMASK + 1. So expand
> minor range when registering chrdev region.
> 
> Signed-off-by: Chengguang Xu <cgxu519@....com>
> Acked-by: Wu Hao <hao.wu@...el.com>
> Acked-by: Alan Tull <atull@...nel.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Signed-off-by: Sasha Levin <sashal@...nel.org>
> ---
>  drivers/fpga/dfl.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c
> index c25217cde5ca..4b66aaa32b5a 100644
> --- a/drivers/fpga/dfl.c
> +++ b/drivers/fpga/dfl.c
> @@ -322,7 +322,7 @@ static void dfl_chardev_uinit(void)
>  	for (i = 0; i < DFL_FPGA_DEVT_MAX; i++)
>  		if (MAJOR(dfl_chrdevs[i].devt)) {
>  			unregister_chrdev_region(dfl_chrdevs[i].devt,
> -						 MINORMASK);
> +						 MINORMASK + 1);
>  			dfl_chrdevs[i].devt = MKDEV(0, 0);
>  		}
>  }
> @@ -332,8 +332,8 @@ static int dfl_chardev_init(void)
>  	int i, ret;
>  
>  	for (i = 0; i < DFL_FPGA_DEVT_MAX; i++) {
> -		ret = alloc_chrdev_region(&dfl_chrdevs[i].devt, 0, MINORMASK,
> -					  dfl_chrdevs[i].name);
> +		ret = alloc_chrdev_region(&dfl_chrdevs[i].devt, 0,
> +					  MINORMASK + 1, dfl_chrdevs[i].name);
>  		if (ret)
>  			goto exit;
>  	}

Not a bugfix, so not needed for stable kernels, thanks.

greg k-h