linux-kernel - [PATCH 1/5] frv: restart_block.fn needs to be reset on sigreturn

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Message-ID: <20100920141304.11066.51314.stgit@warthog.procyon.org.uk>
Date:	Mon, 20 Sep 2010 15:13:04 +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 1/5] frv: restart_block.fn needs to be reset on sigreturn

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

Reset restart_block.fn on executing a sigreturn such that any currently pending
system call restarts will be forced to return -EINTR.

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

 arch/frv/kernel/signal.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)


diff --git a/arch/frv/kernel/signal.c b/arch/frv/kernel/signal.c
index 0974c0e..7fc2961 100644
--- a/arch/frv/kernel/signal.c
+++ b/arch/frv/kernel/signal.c
@@ -121,6 +121,9 @@ static int restore_sigcontext(struct sigcontext __user *sc, int *_gr8)
 	struct user_context *user = current->thread.user;
 	unsigned long tbr, psr;
 
+	/* Always make any pending restarted system calls return -EINTR */
+	current_thread_info()->restart_block.fn = do_no_restart_syscall;
+
 	tbr = user->i.tbr;
 	psr = user->i.psr;
 	if (copy_from_user(user, &sc->sc_context, sizeof(sc->sc_context)))

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