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Re: [PATCH 5/7] Fix double call to pthread_mutex_unlock in _treefs_s_dir


From: Samuel Thibault
Subject: Re: [PATCH 5/7] Fix double call to pthread_mutex_unlock in _treefs_s_dir_lookup.
Date: Mon, 17 Dec 2012 01:31:32 +0100
User-agent: Mutt/1.5.21+34 (58baf7c9f32f) (2010-12-30)

Cyril Roelandt, le Mon 17 Dec 2012 00:51:28 +0100, a écrit :
> * libtreefs/dir-lookup.c (_treefs_s_dir_lookup): remove a redundant call to
> pthread_mutex_unlock.
> 
> Signed-off-by: Cyril Roelandt <address@hidden>
> ---
>  libtreefs/dir-lookup.c |    1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/libtreefs/dir-lookup.c b/libtreefs/dir-lookup.c
> index ce2acaf..41c34ea 100644
> --- a/libtreefs/dir-lookup.c
> +++ b/libtreefs/dir-lookup.c
> @@ -199,7 +199,6 @@ _treefs_s_dir_lookup (struct treefs_handle *h,
>            in the right order. */
>         if (strcmp (path, "..") != 0)
>           {
> -           pthread_mutex_unlock (&node->lock);
>             pthread_mutex_lock (&dir->lock);
>             pthread_mutex_lock (&node->lock);

At quick sight I don't think this one is spurious, see the comment: this
code seems to be used when one wants to lock dir->lock, which we can
not do when we already have node->lock, that's why we have to release
node->lock before taking dir->lock again.

Samuel



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