h63xx: tsc2101 alsa sound support

[linux-2.6-omap-h63xx.git] / kernel / signal.c

diff --git a/kernel/signal.c b/kernel/signal.c
index 64737c72daddc3f7d79d800aaaa598a6a9b45be7..ea154104a00bf43a6a62a7d90d229465a4bfbc95 100644 (file)
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -25,6 +25,7 @@
 #include <linux/posix-timers.h>
 #include <linux/signal.h>
 #include <linux/audit.h>
+#include <linux/capability.h>
 #include <asm/param.h>
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
@@ -282,7 +283,7 @@ static struct sigqueue *__sigqueue_alloc(struct task_struct *t, gfp_t flags,
        return(q);
 }
 
-static inline void __sigqueue_free(struct sigqueue *q)
+static void __sigqueue_free(struct sigqueue *q)
 {
        if (q->flags & SIGQUEUE_PREALLOC)
                return;
@@ -364,8 +365,6 @@ void __exit_signal(struct task_struct *tsk)
        posix_cpu_timers_exit(tsk);
        if (atomic_dec_and_test(&sig->count)) {
                posix_cpu_timers_exit_group(tsk);
-               if (tsk == sig->curr_target)
-                       sig->curr_target = next_thread(tsk);
                tsk->signal = NULL;
                __exit_sighand(tsk);
                spin_unlock(&sighand->siglock);
@@ -477,7 +476,7 @@ unblock_all_signals(void)
        spin_unlock_irqrestore(&current->sighand->siglock, flags);
 }
 
-static inline int collect_signal(int sig, struct sigpending *list, siginfo_t *info)
+static int collect_signal(int sig, struct sigpending *list, siginfo_t *info)
 {
        struct sigqueue *q, *first = NULL;
        int still_pending = 0;
@@ -620,6 +619,33 @@ void signal_wake_up(struct task_struct *t, int resume)
                kick_process(t);
 }
 
+/*
+ * Remove signals in mask from the pending set and queue.
+ * Returns 1 if any signals were found.
+ *
+ * All callers must be holding the siglock.
+ *
+ * This version takes a sigset mask and looks at all signals,
+ * not just those in the first mask word.
+ */
+static int rm_from_queue_full(sigset_t *mask, struct sigpending *s)
+{
+       struct sigqueue *q, *n;
+       sigset_t m;
+
+       sigandsets(&m, mask, &s->signal);
+       if (sigisemptyset(&m))
+               return 0;
+
+       signandsets(&s->signal, &s->signal, mask);
+       list_for_each_entry_safe(q, n, &s->list, list) {
+               if (sigismember(mask, q->info.si_signo)) {
+                       list_del_init(&q->list);
+                       __sigqueue_free(q);
+               }
+       }
+       return 1;
+}
 /*
  * Remove signals in mask from the pending set and queue.
  * Returns 1 if any signals were found.
@@ -1102,18 +1128,19 @@ int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p)
 
 retry:
        ret = check_kill_permission(sig, info, p);
-       if (!ret && sig && (sp = p->sighand)) {
-               if (!get_task_struct_rcu(p))
-                       return -ESRCH;
+       if (!ret && sig && (sp = rcu_dereference(p->sighand))) {
                spin_lock_irqsave(&sp->siglock, flags);
                if (p->sighand != sp) {
                        spin_unlock_irqrestore(&sp->siglock, flags);
-                       put_task_struct(p);
                        goto retry;
                }
+               if ((atomic_read(&sp->count) == 0) ||
+                               (atomic_read(&p->usage) == 0)) {
+                       spin_unlock_irqrestore(&sp->siglock, flags);
+                       return -ESRCH;
+               }
                ret = __group_send_sig_info(sig, info, p);
                spin_unlock_irqrestore(&sp->siglock, flags);
-               put_task_struct(p);
        }
 
        return ret;
@@ -1192,8 +1219,7 @@ int kill_proc_info_as_uid(int sig, struct siginfo *info, pid_t pid,
                ret = -ESRCH;
                goto out_unlock;
        }
-       if ((!info || ((unsigned long)info != 1 &&
-                       (unsigned long)info != 2 && SI_FROMUSER(info)))
+       if ((info == SEND_SIG_NOINFO || (!is_si_special(info) && SI_FROMUSER(info)))
            && (euid != p->suid) && (euid != p->uid)
            && (uid != p->suid) && (uid != p->uid)) {
                ret = -EPERM;
@@ -1855,7 +1881,7 @@ do_signal_stop(int signr)
  * We return zero if we still hold the siglock and should look
  * for another signal without checking group_stop_count again.
  */
-static inline int handle_group_stop(void)
+static int handle_group_stop(void)
 {
        int stop_count;
 
@@ -2404,9 +2430,10 @@ sys_rt_sigqueueinfo(int pid, int sig, siginfo_t __user *uinfo)
 }
 
 int
-do_sigaction(int sig, const struct k_sigaction *act, struct k_sigaction *oact)
+do_sigaction(int sig, struct k_sigaction *act, struct k_sigaction *oact)
 {
        struct k_sigaction *k;
+       sigset_t mask;
 
        if (!valid_signal(sig) || sig < 1 || (act && sig_kernel_only(sig)))
                return -EINVAL;
@@ -2427,6 +2454,8 @@ do_sigaction(int sig, const struct k_sigaction *act, struct k_sigaction *oact)
                *oact = *k;
 
        if (act) {
+               sigdelsetmask(&act->sa.sa_mask,
+                             sigmask(SIGKILL) | sigmask(SIGSTOP));
                /*
                 * POSIX 3.3.1.3:
                 *  "Setting a signal action to SIG_IGN for a signal that is
@@ -2452,11 +2481,11 @@ do_sigaction(int sig, const struct k_sigaction *act, struct k_sigaction *oact)
                        read_lock(&tasklist_lock);
                        spin_lock_irq(&t->sighand->siglock);
                        *k = *act;
-                       sigdelsetmask(&k->sa.sa_mask,
-                                     sigmask(SIGKILL) | sigmask(SIGSTOP));
-                       rm_from_queue(sigmask(sig), &t->signal->shared_pending);
+                       sigemptyset(&mask);
+                       sigaddset(&mask, sig);
+                       rm_from_queue_full(&mask, &t->signal->shared_pending);
                        do {
-                               rm_from_queue(sigmask(sig), &t->pending);
+                               rm_from_queue_full(&mask, &t->pending);
                                recalc_sigpending_tsk(t);
                                t = next_thread(t);
                        } while (t != current);
@@ -2466,8 +2495,6 @@ do_sigaction(int sig, const struct k_sigaction *act, struct k_sigaction *oact)
                }
 
                *k = *act;
-               sigdelsetmask(&k->sa.sa_mask,
-                             sigmask(SIGKILL) | sigmask(SIGSTOP));
        }
 
        spin_unlock_irq(&current->sighand->siglock);
@@ -2673,6 +2700,7 @@ sys_signal(int sig, __sighandler_t handler)
 
        new_sa.sa.sa_handler = handler;
        new_sa.sa.sa_flags = SA_ONESHOT | SA_NOMASK;
+       sigemptyset(&new_sa.sa.sa_mask);
 
        ret = do_sigaction(sig, &new_sa, &old_sa);
 
@@ -2692,6 +2720,32 @@ sys_pause(void)
 
 #endif
 
+#ifdef __ARCH_WANT_SYS_RT_SIGSUSPEND
+asmlinkage long sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize)
+{
+       sigset_t newset;
+
+       /* XXX: Don't preclude handling different sized sigset_t's.  */
+       if (sigsetsize != sizeof(sigset_t))
+               return -EINVAL;
+
+       if (copy_from_user(&newset, unewset, sizeof(newset)))
+               return -EFAULT;
+       sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
+
+       spin_lock_irq(&current->sighand->siglock);
+       current->saved_sigmask = current->blocked;
+       current->blocked = newset;
+       recalc_sigpending();
+       spin_unlock_irq(&current->sighand->siglock);
+
+       current->state = TASK_INTERRUPTIBLE;
+       schedule();
+       set_thread_flag(TIF_RESTORE_SIGMASK);
+       return -ERESTARTNOHAND;
+}
+#endif /* __ARCH_WANT_SYS_RT_SIGSUSPEND */
+
 void __init signals_init(void)
 {
        sigqueue_cachep =