linux-kernel - Re: linux-next: manual merge of the bkl-ioctl tree with the bkl-procfs tree

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Date:	Tue, 27 Apr 2010 07:18:42 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
Cc:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: linux-next: manual merge of the bkl-ioctl tree with the
	bkl-procfs tree

On Tue, Apr 27, 2010 at 03:06:36PM +1000, Stephen Rothwell wrote:
> Hi Frédéric,
> 
> Today's linux-next merge of the bkl-ioctl tree got a conflict in
> fs/proc/inode.c between commit 3ab8dfb0802f33741cc4afa6adf7cb30b1cd1761
> ("procfs: Kill the bkl in ioctl") from the bkl-procfs tree and commit
> 1dd97d3d546aa14db7efa5366b21d1336b91379e ("Rename 'struct
> file_operations' 'ioctl' fn pointer to 'bkl_ioctl'") from the bkl-ioctl
> tree.
> 
> I fixed it up (see below - probably not optimal) and can carry the fix as
> necessary.
> -- 
> Cheers,
> Stephen Rothwell                    sfr@...b.auug.org.au
> 
> diff --cc fs/proc/inode.c
> index aea8502,8e8f813..0000000
> --- a/fs/proc/inode.c
> +++ b/fs/proc/inode.c
> @@@ -231,10 -231,10 +231,10 @@@ static long proc_reg_unlocked_ioctl(str
>   		rv = unlocked_ioctl(file, cmd, arg);
>   		if (rv == -ENOIOCTLCMD)
>   			rv = -EINVAL;
> - 	} else if (ioctl) {
> + 	} else if (bkl_ioctl) {
>  -		lock_kernel();
>  +		WARN_ONCE(1, "Procfs ioctl handlers must use unlocked_ioctl, "
>  +			  "%pf will be called without the Bkl held\n", bkl_ioctl);
> - 		rv = ioctl(file->f_path.dentry->d_inode, file, cmd, arg);
> + 		rv = bkl_ioctl(file->f_path.dentry->d_inode, file, cmd, arg);
>  -		unlock_kernel();
>   	}
>   
>   	pde_users_dec(pde);


Thanks, looks like the right fix!

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