usermodehelper: Tidy up waiting
Rather than using a tri-state integer for the wait flag in
call_usermodehelper_exec, define a proper enum, and use that. I've
preserved the integer values so that any callers I've missed should
still work OK.
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Andi Kleen <ak@suse.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Joel Becker <joel.becker@oracle.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Srivatsa Vaddagiri <vatsa@in.ibm.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: David Howells <dhowells@redhat.com>
diff --git a/kernel/kmod.c b/kernel/kmod.c
index d2dce71..78d365c 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -119,7 +119,7 @@
char **argv;
char **envp;
struct key *ring;
- int wait;
+ enum umh_wait wait;
int retval;
struct file *stdin;
void (*cleanup)(char **argv, char **envp);
@@ -225,7 +225,7 @@
sub_info->retval = ret;
}
- if (sub_info->wait < 0)
+ if (sub_info->wait == UMH_NO_WAIT)
call_usermodehelper_freeinfo(sub_info);
else
complete(sub_info->complete);
@@ -238,26 +238,31 @@
struct subprocess_info *sub_info =
container_of(work, struct subprocess_info, work);
pid_t pid;
- int wait = sub_info->wait;
+ enum umh_wait wait = sub_info->wait;
/* CLONE_VFORK: wait until the usermode helper has execve'd
* successfully We need the data structures to stay around
* until that is done. */
- if (wait)
+ if (wait == UMH_WAIT_PROC || wait == UMH_NO_WAIT)
pid = kernel_thread(wait_for_helper, sub_info,
CLONE_FS | CLONE_FILES | SIGCHLD);
else
pid = kernel_thread(____call_usermodehelper, sub_info,
CLONE_VFORK | SIGCHLD);
- if (wait < 0)
- return;
+ switch (wait) {
+ case UMH_NO_WAIT:
+ break;
- if (pid < 0) {
+ case UMH_WAIT_PROC:
+ if (pid > 0)
+ break;
sub_info->retval = pid;
+ /* FALLTHROUGH */
+
+ case UMH_WAIT_EXEC:
complete(sub_info->complete);
- } else if (!wait)
- complete(sub_info->complete);
+ }
}
/**
@@ -359,7 +364,7 @@
* (ie. it runs with full root capabilities).
*/
int call_usermodehelper_exec(struct subprocess_info *sub_info,
- int wait)
+ enum umh_wait wait)
{
DECLARE_COMPLETION_ONSTACK(done);
int retval;
@@ -378,7 +383,7 @@
sub_info->wait = wait;
queue_work(khelper_wq, &sub_info->work);
- if (wait < 0) /* task has freed sub_info */
+ if (wait == UMH_NO_WAIT) /* task has freed sub_info */
return 0;
wait_for_completion(&done);
retval = sub_info->retval;