Re: [PATCH] knfsd: check for existence of file_lock parameter inside of the kernel lock.

[Matthew Wilcox]

On Wed, Jan 05, 2005 at 05:48:59AM +0000, Linux Kernel Mailing List wrote:
> ChangeSet 1.2177, 2005/01/04 21:48:59-08:00, neilb@xxxxxxxxxxxxxxx
> 
> 	[PATCH] knfsd: check for existence of file_lock parameter inside of the kernel lock.

Why?  What is lock_kernel() protecting here?

> 	Signed-off-by: Andy Adamson <andros@xxxxxxxxxxxxxx>
> 	Signed-off-by: Neil Brown <neilb@xxxxxxxxxxxxxxx>
> 	Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
> 	Signed-off-by: Linus Torvalds <torvalds@xxxxxxxx>
> 
> 
> 
>  locks.c |    8 +++-----
>  1 files changed, 3 insertions(+), 5 deletions(-)
> 
> 
> diff -Nru a/fs/locks.c b/fs/locks.c
> --- a/fs/locks.c	2005-01-04 23:42:28 -08:00
> +++ b/fs/locks.c	2005-01-04 23:42:28 -08:00
> @@ -1096,15 +1096,13 @@
>  */
>  void remove_lease(struct file_lock *fl)
>  {
> -	if (!IS_LEASE(fl))
> -		return;
> -
>  	lock_kernel();
> -
> +	if (!fl || !IS_LEASE(fl))
> +		goto out;
>  	fl->fl_type = F_UNLCK | F_INPROGRESS;
>  	fl->fl_break_time = jiffies - 10;
>  	time_out_leases(fl->fl_file->f_dentry->d_inode);
> -
> +out:
>  	unlock_kernel();
>  }
>  
> -
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