linux-kernel - [PATCH v3 6/7] Split remaining calls to call_usermodehelper

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Message-Id: <1363049291-946-6-git-send-email-lucas.demarchi@profusion.mobi>
Date:	Mon, 11 Mar 2013 21:48:10 -0300
From:	Lucas De Marchi <lucas.demarchi@...fusion.mobi>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	lucas.de.marchi@...il.com, David Howells <dhowells@...hat.com>,
	James Morris <james.l.morris@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Lucas De Marchi <lucas.demarchi@...fusion.mobi>
Subject: [PATCH v3 6/7] Split remaining calls to call_usermodehelper_fns()

These are the only users of call_usermodehelper_fns(). This function
suffers from not being able to determine if the cleanup is called. Even
if in this places the cleanup pointer is NULL, convert them to use the
separate call_usermodehelper_setup() + call_usermodehelper_exec()
functions so we can remove the _fns variant.

Signed-off-by: Lucas De Marchi <lucas.demarchi@...fusion.mobi>
---

Changes from v2: simplify error handling as suggested by Oleg.

 fs/coredump.c           | 12 +++++++++---
 init/do_mounts_initrd.c |  8 ++++++--
 2 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/fs/coredump.c b/fs/coredump.c
index 7dfb3b0..d52f6bd 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -525,6 +525,7 @@ void do_coredump(siginfo_t *siginfo)
 	if (ispipe) {
 		int dump_count;
 		char **helper_argv;
+		struct subprocess_info *sub_info;
 
 		if (ispipe < 0) {
 			printk(KERN_WARNING "format_corename failed\n");
@@ -571,9 +572,14 @@ void do_coredump(siginfo_t *siginfo)
 			goto fail_dropcount;
 		}
 
-		retval = call_usermodehelper_fns(helper_argv[0], helper_argv,
-					NULL, UMH_WAIT_EXEC, umh_pipe_setup,
-					NULL, &cprm);
+		retval = -ENOMEM;
+		sub_info = call_usermodehelper_setup(helper_argv[0],
+						helper_argv, NULL, GFP_KERNEL,
+						umh_pipe_setup, NULL, &cprm);
+		if (sub_info)
+			retval = call_usermodehelper_exec(sub_info,
+							  UMH_WAIT_EXEC);
+
 		argv_free(helper_argv);
 		if (retval) {
 			printk(KERN_INFO "Core dump to %s pipe failed\n",
diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c
index a32ec1c..3e0878e 100644
--- a/init/do_mounts_initrd.c
+++ b/init/do_mounts_initrd.c
@@ -50,6 +50,7 @@ static int init_linuxrc(struct subprocess_info *info, struct cred *new)
 
 static void __init handle_initrd(void)
 {
+	struct subprocess_info *info;
 	static char *argv[] = { "linuxrc", NULL, };
 	extern char *envp_init[];
 	int error;
@@ -70,8 +71,11 @@ static void __init handle_initrd(void)
 	 */
 	current->flags |= PF_FREEZER_SKIP;
 
-	call_usermodehelper_fns("/linuxrc", argv, envp_init, UMH_WAIT_PROC,
-			init_linuxrc, NULL, NULL);
+	info = call_usermodehelper_setup("/linuxrc", argv, envp_init,
+					 GFP_KERNEL, init_linuxrc, NULL, NULL);
+	if (!info)
+		return;
+	call_usermodehelper_exec(info, UMH_WAIT_PROC);
 
 	current->flags &= ~PF_FREEZER_SKIP;
 
-- 
1.8.1.5

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