linux-kernel - [PATCH] proc: less LOCK/UNLOCK in remove_proc

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Message-ID: <20101127152420.GA9514@core2.telecom.by>
Date:	Sat, 27 Nov 2010 17:24:21 +0200
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] proc: less LOCK/UNLOCK in remove_proc_entry()

For the common case, when proc entry is being removed and nobody is in
the process of using it, save LOCK/UNLOCK pair.

Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
---

 fs/proc/generic.c |    5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -834,12 +834,9 @@ void remove_proc_entry(const char *name, struct proc_dir_entry *parent)
 
 		wait_for_completion(de->pde_unload_completion);
 
-		goto continue_removing;
+		spin_lock(&de->pde_unload_lock);
 	}
-	spin_unlock(&de->pde_unload_lock);
 
-continue_removing:
-	spin_lock(&de->pde_unload_lock);
 	while (!list_empty(&de->pde_openers)) {
 		struct pde_opener *pdeo;
 
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