diff options
Diffstat (limited to 'kernel/kmod.c')
| -rw-r--r-- | kernel/kmod.c | 43 |
1 files changed, 5 insertions, 38 deletions
diff --git a/kernel/kmod.c b/kernel/kmod.c index 80f7a6d0051..2777f40a9c7 100644 --- a/kernel/kmod.c +++ b/kernel/kmod.c @@ -47,13 +47,6 @@ extern int max_threads; static struct workqueue_struct *khelper_wq; -/* - * kmod_thread_locker is used for deadlock avoidance. There is no explicit - * locking to protect this global - it is private to the singleton khelper - * thread and should only ever be modified by that thread. - */ -static const struct task_struct *kmod_thread_locker; - #define CAP_BSET (void *)1 #define CAP_PI (void *)2 @@ -223,7 +216,6 @@ 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; @@ -267,20 +259,13 @@ 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; do_exit(0); } -static int call_helper(void *data) -{ - /* Worker thread started blocking khelper thread. */ - kmod_thread_locker = current; - return ____call_usermodehelper(data); -} - /* Keventd can't block, but this (a child) can. */ static int wait_for_helper(void *data) { @@ -323,21 +308,14 @@ 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); - /* Worker thread stopped blocking khelper thread. */ - kmod_thread_locker = NULL; - } + else + pid = kernel_thread(____call_usermodehelper, sub_info, + SIGCHLD); if (pid < 0) { sub_info->retval = pid; @@ -571,17 +549,6 @@ int call_usermodehelper_exec(struct subprocess_info *sub_info, int wait) goto out; } /* - * Worker thread must not wait for khelper thread at below - * wait_for_completion() if the thread was created with CLONE_VFORK - * flag, for khelper thread is already waiting for the thread at - * wait_for_completion() in do_fork(). - */ - if (wait != UMH_NO_WAIT && current == kmod_thread_locker) { - retval = -EBUSY; - goto out; - } - - /* * Set the completion pointer only if there is a waiter. * This makes it possible to use umh_complete to free * the data structure in case of UMH_NO_WAIT. |