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locks: use list_first_entry_or_null() 

Simplify the code with list_first_entry_or_null().

Signed-off-by: Geliang Tang <geliangtang@163.com>
Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
This commit is contained in:
Geliang Tang 2015-11-18 21:40:33 +08:00 committed by Jeff Layton
parent 95ace75414
commit 8ace5dfb98
1 changed files with 4 additions and 6 deletions
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10
fs/locks.c
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@ -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);
}