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nbd.c: sock_xmit: cleanup signal related code 

sock_xmit() re-implements sigprocmask() and dequeue_signal_lock().

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: Paul Clements <paul.clements@steeleye.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2007-07-15 23:41:32 -07:00 committed by Linus Torvalds
parent 3e1ac130d0
commit be0ef957c9
1 changed files with 6 additions and 16 deletions
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22
drivers/block/nbd.c
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@ -122,17 +122,12 @@ static int sock_xmit(struct socket *sock, int send, void *buf, int size,
int result;
struct msghdr msg;
struct kvec iov;
unsigned long flags;
sigset_t oldset;
sigset_t blocked, oldset;
/* Allow interception of SIGKILL only
* Don't allow other signals to interrupt the transmission */
spin_lock_irqsave(&current->sighand->siglock, flags);
oldset = current->blocked;
sigfillset(&current->blocked);
sigdelsetmask(&current->blocked, sigmask(SIGKILL));
recalc_sigpending();
spin_unlock_irqrestore(&current->sighand->siglock, flags);
siginitsetinv(&blocked, sigmask(SIGKILL));
sigprocmask(SIG_SETMASK, &blocked, &oldset);
do {
sock->sk->sk_allocation = GFP_NOIO;
@ -151,11 +146,9 @@ static int sock_xmit(struct socket *sock, int send, void *buf, int size,
if (signal_pending(current)) {
siginfo_t info;
spin_lock_irqsave(&current->sighand->siglock, flags);
printk(KERN_WARNING "nbd (pid %d: %s) got signal %d\n",
current->pid, current->comm,
dequeue_signal(current, &current->blocked, &info));
spin_unlock_irqrestore(&current->sighand->siglock, flags);
current->pid, current->comm,
dequeue_signal_lock(current, &current->blocked, &info));
result = -EINTR;
break;
}
@ -169,10 +162,7 @@ static int sock_xmit(struct socket *sock, int send, void *buf, int size,
buf += result;
} while (size > 0);
spin_lock_irqsave(&current->sighand->siglock, flags);
current->blocked = oldset;
recalc_sigpending();
spin_unlock_irqrestore(&current->sighand->siglock, flags);
sigprocmask(SIG_SETMASK, &oldset, NULL);
return result;
}