linux-kernel - [PATCH 5/5] frv: double syscall restarts, syscall restart in sigreturn()

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Date:	Mon, 20 Sep 2010 15:13:25 +0100
From:	David Howells <dhowells@...hat.com>
To:	torvalds@...l.org, akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>,
	David Howells <dhowells@...hat.com>
Subject: [PATCH 5/5] frv: double syscall restarts,
	syscall restart in sigreturn()

From: Al Viro <viro@....linux.org.uk>

We need to make sure that only the first do_signal() to be handled
on the way out syscall will bother with syscall restarts; additionally,
the check on the "signal has user handler" path had been wrong -
compare with restart prevention in sigreturn()...

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: David Howells <dhowells@...hat.com>
---

 arch/frv/kernel/signal.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)


diff --git a/arch/frv/kernel/signal.c b/arch/frv/kernel/signal.c
index bd13b57..bab0129 100644
--- a/arch/frv/kernel/signal.c
+++ b/arch/frv/kernel/signal.c
@@ -446,7 +446,7 @@ static int handle_signal(unsigned long sig, siginfo_t *info,
 	int ret;
 
 	/* Are we from a system call? */
-	if (in_syscall(__frame)) {
+	if (__frame->syscallno != -1) {
 		/* If so, check system call restarting.. */
 		switch (__frame->gr8) {
 		case -ERESTART_RESTARTBLOCK:
@@ -465,6 +465,7 @@ static int handle_signal(unsigned long sig, siginfo_t *info,
 			__frame->gr8 = __frame->orig_gr8;
 			__frame->pc -= 4;
 		}
+		__frame->syscallno = -1;
 	}
 
 	/* Set up the stack frame */
@@ -551,6 +552,7 @@ no_signal:
 			__frame->pc -= 4;
 			break;
 		}
+		__frame->syscallno = -1;
 	}
 
 	/* if there's no signal to deliver, we just put the saved sigmask

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