xfs: remove nr_to_write writeback windup.

[safe/jmp/linux-2.6] / kernel / kmod.c

diff --git a/kernel/kmod.c b/kernel/kmod.c
index 7efba6f..6e9b196 100644 (file)
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -175,16 +175,16 @@ static int wait_for_helper(void *data)
        struct subprocess_info *sub_info = data;
        pid_t pid;
 
-       /* Install a handler: if SIGCLD isn't handled sys_wait4 won't
-        * populate the status, but will return -ECHILD. */
-       allow_signal(SIGCHLD);
+       /* If SIGCLD is ignored sys_wait4 won't populate the status. */
+       spin_lock_irq(&current->sighand->siglock);
+       current->sighand->action[SIGCHLD-1].sa.sa_handler = SIG_DFL;
+       spin_unlock_irq(&current->sighand->siglock);
 
        pid = kernel_thread(____call_usermodehelper, sub_info, SIGCHLD);
        if (pid < 0) {
                sub_info->retval = pid;
        } else {
-               int ret;
-
+               int ret = -ECHILD;
                /*
                 * Normally it is bogus to call wait4() from in-kernel because
                 * wait4() wants to write the exit code to a userspace address.
@@ -205,10 +205,7 @@ static int wait_for_helper(void *data)
                        sub_info->retval = ret;
        }
 
-       if (sub_info->wait == UMH_NO_WAIT)
-               call_usermodehelper_freeinfo(sub_info);
-       else
-               complete(sub_info->complete);
+       complete(sub_info->complete);
        return 0;
 }
 
@@ -217,13 +214,13 @@ static void __call_usermodehelper(struct work_struct *work)
 {
        struct subprocess_info *sub_info =
                container_of(work, struct subprocess_info, work);
-       pid_t pid;
        enum umh_wait wait = sub_info->wait;
+       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 || wait == UMH_NO_WAIT)
+       if (wait == UMH_WAIT_PROC)
                pid = kernel_thread(wait_for_helper, sub_info,
                                    CLONE_FS | CLONE_FILES | SIGCHLD);
        else
@@ -232,15 +229,16 @@ static void __call_usermodehelper(struct work_struct *work)
 
        switch (wait) {
        case UMH_NO_WAIT:
+               call_usermodehelper_freeinfo(sub_info);
                break;
 
        case UMH_WAIT_PROC:
                if (pid > 0)
                        break;
-               sub_info->retval = pid;
                /* FALLTHROUGH */
-
        case UMH_WAIT_EXEC:
+               if (pid < 0)
+                       sub_info->retval = pid;
                complete(sub_info->complete);
        }
 }