linux-kernel - Re: [PATCH] init:enable usermodehelper as soon as we have a root filesystem

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Date:	Thu, 27 Oct 2011 08:39:16 +0800
From:	wangyanqing <udknight@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] init:enable usermodehelper as soon as we have a root
 filesystem

On Sun, Oct 23, 2011 at 11:09:57PM +0800, wangyanqing wrote:
> before we have a filesystem , it is useless to enable usermodehelper,
> and it may cause bug if we enable usermodehelper too early (see commit
> d5767c53535ac79758084773418e0ad186aba4a2 for the reason why linus mv 
> 'usermodehelper_enable()' to the end of do_basic_setup, and commit 
> b0f84374b6ab0dc9c47975df0b02d46165d558d4).This patch
> enable usermodehelper as soon as we have a filesystem.
> 
> Signed-off-by: wang yanqing <udknight@...il.com>
> ---
>  init/do_mounts.c |    3 +++
>  init/initramfs.c |    2 ++
>  init/main.c      |    1 -
>  3 files changed, 5 insertions(+), 1 deletions(-)
> 
> diff --git a/init/do_mounts.c b/init/do_mounts.c
> index c0851a8..9575bdd 100644
> --- a/init/do_mounts.c
> +++ b/init/do_mounts.c
> @@ -490,4 +490,7 @@ out:
>  	devtmpfs_mount("dev");
>  	sys_mount(".", "/", NULL, MS_MOVE, NULL);
>  	sys_chroot((const char __user __force *)".");
> +#ifndef CONFIG_BLK_DEV_INITRD
> +	usermodehelper_enable();
> +#endif
>  }
> diff --git a/init/initramfs.c b/init/initramfs.c
> index 2531811..881fc4b 100644
> --- a/init/initramfs.c
> +++ b/init/initramfs.c
> @@ -581,6 +581,7 @@ static int __init populate_rootfs(void)
>  		err = unpack_to_rootfs((char *)initrd_start,
>  			initrd_end - initrd_start);
>  		if (!err) {
> +			usermodehelper_enable();
>  			free_initrd();
>  			return 0;
>  		} else {
> @@ -603,6 +604,7 @@ static int __init populate_rootfs(void)
>  			initrd_end - initrd_start);
>  		if (err)
>  			printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err);
> +		usermodehelper_enable();
>  		free_initrd();
>  #endif
>  	}
> diff --git a/init/main.c b/init/main.c
> index 03b408d..2e232cb 100644
> --- a/init/main.c
> +++ b/init/main.c
> @@ -730,7 +730,6 @@ static void __init do_basic_setup(void)
>  	driver_init();
>  	init_irq_proc();
>  	do_ctors();
> -	usermodehelper_enable();
>  	do_initcalls();
>  }
>  
> -- 
> 1.7.3.4
> 
Hi,Linus.Sorry, but I just want to know whether this patch is wrong? And any suggestion is welcome, thanks!
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