linux-kernel - [ 013/184] kmod: introduce call

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Date:	Tue, 04 Jun 2013 19:21:43 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Tejun Heo <tj@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Willy Tarreau <w@....eu>
Subject: [ 013/184] kmod: introduce call_modprobe() helper

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

------------------

From: Oleg Nesterov <oleg@...hat.com>

commit 3e63a93b987685f02421e18b2aa452d20553a88b upstream

No functional changes.  Move the call_usermodehelper code from
__request_module() into the new simple helper, call_modprobe().

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
Cc: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc: Rusty Russell <rusty@...tcorp.com.au>
Cc: Tejun Heo <tj@...nel.org>
Cc: David Rientjes <rientjes@...gle.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
[dannf: backported to Debian's 2.6.32]
Signed-off-by: Willy Tarreau <w@....eu>
---
 kernel/kmod.c | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/kernel/kmod.c b/kernel/kmod.c
index f12d883..1088a8f 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -53,6 +53,18 @@ static DECLARE_RWSEM(umhelper_sem);
 */
 char modprobe_path[KMOD_PATH_LEN] = "/sbin/modprobe";
 
+static int call_modprobe(char *module_name, int wait)
+{
+	static char *envp[] = { "HOME=/",
+				"TERM=linux",
+				"PATH=/sbin:/usr/sbin:/bin:/usr/bin",
+				NULL };
+
+	char *argv[] = { modprobe_path, "-q", "--", module_name, NULL };
+
+	return call_usermodehelper(modprobe_path, argv, envp, wait);
+}
+
 /**
  * __request_module - try to load a kernel module
  * @wait: wait (or not) for the operation to complete
@@ -74,11 +86,6 @@ int __request_module(bool wait, const char *fmt, ...)
 	char module_name[MODULE_NAME_LEN];
 	unsigned int max_modprobes;
 	int ret;
-	char *argv[] = { modprobe_path, "-q", "--", module_name, NULL };
-	static char *envp[] = { "HOME=/",
-				"TERM=linux",
-				"PATH=/sbin:/usr/sbin:/bin:/usr/bin",
-				NULL };
 	static atomic_t kmod_concurrent = ATOMIC_INIT(0);
 #define MAX_KMOD_CONCURRENT 50	/* Completely arbitrary value - KAO */
 	static int kmod_loop_msg;
@@ -121,8 +128,8 @@ int __request_module(bool wait, const char *fmt, ...)
 
 	trace_module_request(module_name, wait, _RET_IP_);
 
-	ret = call_usermodehelper(modprobe_path, argv, envp,
-			wait ? UMH_WAIT_PROC : UMH_WAIT_EXEC);
+	ret = call_modprobe(module_name, wait ? UMH_WAIT_PROC : UMH_WAIT_EXEC);
+
 	atomic_dec(&kmod_concurrent);
 	return ret;
 }
-- 
1.7.12.2.21.g234cd45.dirty



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