X-Git-Url: http://pilppa.org/gitweb/?a=blobdiff_plain;f=fs%2Fexec.c;h=8344ba73a2a670d37d2b08a2587e149490f87eaa;hb=20dbfad8e5dfea56b3cb0cfd4465f01c37b57aa6;hp=49fa0127a33016bbfd52e1d517ea1cc954d32ecd;hpb=7b1c6154fa8bb937e0b1b4f2adbb315d70270f10;p=linux-2.6-omap-h63xx.git

diff --git a/fs/exec.c b/fs/exec.c
index 49fa0127a33..8344ba73a2a 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -22,7 +22,6 @@
  * formats. 
  */
 
-#include <linux/config.h>
 #include <linux/slab.h>
 #include <linux/file.h>
 #include <linux/mman.h>
@@ -1371,13 +1370,7 @@ static void format_corename(char *corename, const char *pattern, long signr)
 static void zap_process(struct task_struct *start)
 {
 	struct task_struct *t;
-	unsigned long flags;
 
-	/*
-	 * start->sighand can't disappear, but may be
-	 * changed by de_thread()
-	 */
-	lock_task_sighand(start, &flags);
 	start->signal->flags = SIGNAL_GROUP_EXIT;
 	start->signal->group_stop_count = 0;
 
@@ -1389,53 +1382,87 @@ static void zap_process(struct task_struct *start)
 			signal_wake_up(t, 1);
 		}
 	} while ((t = next_thread(t)) != start);
-
-	unlock_task_sighand(start, &flags);
 }
 
-static void zap_threads(struct mm_struct *mm)
+static inline int zap_threads(struct task_struct *tsk, struct mm_struct *mm,
+				int exit_code)
 {
 	struct task_struct *g, *p;
-	struct task_struct *tsk = current;
-	struct completion *vfork_done = tsk->vfork_done;
+	unsigned long flags;
+	int err = -EAGAIN;
 
-	/*
-	 * Make sure nobody is waiting for us to release the VM,
-	 * otherwise we can deadlock when we wait on each other
-	 */
-	if (vfork_done) {
-		tsk->vfork_done = NULL;
-		complete(vfork_done);
+	spin_lock_irq(&tsk->sighand->siglock);
+	if (!(tsk->signal->flags & SIGNAL_GROUP_EXIT)) {
+		tsk->signal->group_exit_code = exit_code;
+		zap_process(tsk);
+		err = 0;
 	}
+	spin_unlock_irq(&tsk->sighand->siglock);
+	if (err)
+		return err;
+
+	if (atomic_read(&mm->mm_users) == mm->core_waiters + 1)
+		goto done;
 
 	rcu_read_lock();
 	for_each_process(g) {
+		if (g == tsk->group_leader)
+			continue;
+
 		p = g;
 		do {
 			if (p->mm) {
-				if (p->mm == mm)
+				if (p->mm == mm) {
+					/*
+					 * p->sighand can't disappear, but
+					 * may be changed by de_thread()
+					 */
+					lock_task_sighand(p, &flags);
 					zap_process(p);
+					unlock_task_sighand(p, &flags);
+				}
 				break;
 			}
 		} while ((p = next_thread(p)) != g);
 	}
 	rcu_read_unlock();
+done:
+	return mm->core_waiters;
 }
 
-static void coredump_wait(struct mm_struct *mm)
+static int coredump_wait(int exit_code)
 {
-	DECLARE_COMPLETION(startup_done);
+	struct task_struct *tsk = current;
+	struct mm_struct *mm = tsk->mm;
+	struct completion startup_done;
+	struct completion *vfork_done;
 	int core_waiters;
 
+	init_completion(&mm->core_done);
+	init_completion(&startup_done);
 	mm->core_startup_done = &startup_done;
 
-	zap_threads(mm);
-	core_waiters = mm->core_waiters;
+	core_waiters = zap_threads(tsk, mm, exit_code);
 	up_write(&mm->mmap_sem);
 
+	if (unlikely(core_waiters < 0))
+		goto fail;
+
+	/*
+	 * Make sure nobody is waiting for us to release the VM,
+	 * otherwise we can deadlock when we wait on each other
+	 */
+	vfork_done = tsk->vfork_done;
+	if (vfork_done) {
+		tsk->vfork_done = NULL;
+		complete(vfork_done);
+	}
+
 	if (core_waiters)
 		wait_for_completion(&startup_done);
+fail:
 	BUG_ON(mm->core_waiters);
+	return core_waiters;
 }
 
 int do_coredump(long signr, int exit_code, struct pt_regs * regs)
@@ -1469,22 +1496,9 @@ int do_coredump(long signr, int exit_code, struct pt_regs * regs)
 	}
 	mm->dumpable = 0;
 
-	retval = -EAGAIN;
-	spin_lock_irq(&current->sighand->siglock);
-	if (!(current->signal->flags & SIGNAL_GROUP_EXIT)) {
-		current->signal->flags = SIGNAL_GROUP_EXIT;
-		current->signal->group_exit_code = exit_code;
-		current->signal->group_stop_count = 0;
-		retval = 0;
-	}
-	spin_unlock_irq(&current->sighand->siglock);
-	if (retval) {
-		up_write(&mm->mmap_sem);
+	retval = coredump_wait(exit_code);
+	if (retval < 0)
 		goto fail;
-	}
-
-	init_completion(&mm->core_done);
-	coredump_wait(mm);
 
 	/*
 	 * Clear any false indication of pending signals that might