After the previous fix CLONE_VFORK in __call_usermodehelper() buys
nothing, we rely on on umh_complete() in ____call_usermodehelper()
anyway.
Remove it. This also eliminates the unnecessary sleep/wakeup in the
likely case, and this allows the next change.
While at it, kill the "int wait" locals in ____call_usermodehelper()
and __call_usermodehelper(), they can safely use sub_info->wait.
Signed-off-by: Oleg Nesterov <o...@redhat.com>
---
kernel/kmod.c | 12 +++---------
1 files changed, 3 insertions(+), 9 deletions(-)
diff --git a/kernel/kmod.c b/kernel/kmod.c
index 80f7a6d..4621771 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -223,7 +223,6 @@ static void umh_complete(struct subprocess_info *sub_info)
static int ____call_usermodehelper(void *data)
{
struct subprocess_info *sub_info = data;
- int wait = sub_info->wait & ~UMH_KILLABLE;
struct cred *new;
int retval;
@@ -267,7 +266,7 @@ static int ____call_usermodehelper(void *data)
out:
sub_info->retval = retval;
/* wait_for_helper() will call umh_complete if UHM_WAIT_PROC. */
- if (wait != UMH_WAIT_PROC)
+ if (!(sub_info->wait & UMH_WAIT_PROC))
umh_complete(sub_info);
if (!retval)
return 0;
@@ -323,18 +322,13 @@ static void __call_usermodehelper(struct work_struct
*work)
{
struct subprocess_info *sub_info =
container_of(work, struct subprocess_info, work);
- int wait = sub_info->wait & ~UMH_KILLABLE;
pid_t pid;
- /* 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 == UMH_WAIT_PROC)
+ if (sub_info->wait & UMH_WAIT_PROC)
pid = kernel_thread(wait_for_helper, sub_info,
CLONE_FS | CLONE_FILES | SIGCHLD);
else {
- pid = kernel_thread(call_helper, sub_info,
- CLONE_VFORK | SIGCHLD);
+ pid = kernel_thread(call_helper, sub_info, SIGCHLD);
/* Worker thread stopped blocking khelper thread. */
kmod_thread_locker = NULL;
}
--
1.5.5.1
--
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