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[PATCH] locks: use list_first_entry_or_null()

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  [PATCH] locks: use list_first_entry_or_null() Geliang Tang <geliangtang@163.com> - 2015-11-18 14:50 +0100
    Re: [PATCH] locks: use list_first_entry_or_null() Jeff Layton <jlayton@poochiereds.net> - 2015-11-18 15:30 +0100

#1272184 — [PATCH] locks: use list_first_entry_or_null()

Simplify the code with list_first_entry_or_null().

Signed-off-by: Geliang Tang <geliangtang@163.com>
---
 fs/locks.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/fs/locks.c b/fs/locks.c
index 86c9467..d2ee8e3 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1505,12 +1505,10 @@ void lease_get_mtime(struct inode *inode, struct timespec *time)
 	ctx = smp_load_acquire(&inode->i_flctx);
 	if (ctx && !list_empty_careful(&ctx->flc_lease)) {
 		spin_lock(&ctx->flc_lock);
-		if (!list_empty(&ctx->flc_lease)) {
-			fl = list_first_entry(&ctx->flc_lease,
-						struct file_lock, fl_list);
-			if (fl->fl_type == F_WRLCK)
-				has_lease = true;
-		}
+		fl = list_first_entry_or_null(&ctx->flc_lease,
+					      struct file_lock, fl_list);
+		if (fl && (fl->fl_type == F_WRLCK))
+			has_lease = true;
 		spin_unlock(&ctx->flc_lock);
 	}
 
-- 
2.5.0


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#1272212

On Wed, 18 Nov 2015 21:40:33 +0800
Geliang Tang <geliangtang@163.com> wrote:

> Simplify the code with list_first_entry_or_null().
> 
> Signed-off-by: Geliang Tang <geliangtang@163.com>
> ---
>  fs/locks.c | 10 ++++------
>  1 file changed, 4 insertions(+), 6 deletions(-)
> 
> diff --git a/fs/locks.c b/fs/locks.c
> index 86c9467..d2ee8e3 100644
> --- a/fs/locks.c
> +++ b/fs/locks.c
> @@ -1505,12 +1505,10 @@ void lease_get_mtime(struct inode *inode, struct timespec *time)
>  	ctx = smp_load_acquire(&inode->i_flctx);
>  	if (ctx && !list_empty_careful(&ctx->flc_lease)) {
>  		spin_lock(&ctx->flc_lock);
> -		if (!list_empty(&ctx->flc_lease)) {
> -			fl = list_first_entry(&ctx->flc_lease,
> -						struct file_lock, fl_list);
> -			if (fl->fl_type == F_WRLCK)
> -				has_lease = true;
> -		}
> +		fl = list_first_entry_or_null(&ctx->flc_lease,
> +					      struct file_lock, fl_list);
> +		if (fl && (fl->fl_type == F_WRLCK))
> +			has_lease = true;
>  		spin_unlock(&ctx->flc_lock);
>  	}
>  

Looks fine. I'll merge it for v4.5.

Thanks!
-- 
Jeff Layton <jlayton@poochiereds.net>
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