linux-kernel - [ PATCH 5/6 ] UML - AIO deadlock avoidance

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Message-ID: <20070412162805.GA7250@c2.user-mode-linux.org>
Date:	Thu, 12 Apr 2007 12:28:05 -0400
From:	Jeff Dike <jdike@...toit.com>
To:	Andrew Morton <akpm@...l.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	uml-devel <user-mode-linux-devel@...ts.sourceforge.net>
Subject: [ PATCH 5/6 ] UML - AIO deadlock avoidance

Allow deadlocks to be avoided in the AIO code by setting the pipe to
the I/O thread non-blocking.

Signed-off-by: Jeff Dike <jdike@...ux.intel.com>
--
 arch/um/os-Linux/aio.c |    5 +++++
 1 file changed, 5 insertions(+)

Index: linux-2.6.21-mm/arch/um/os-Linux/aio.c
===================================================================
--- linux-2.6.21-mm.orig/arch/um/os-Linux/aio.c	2007-04-12 11:34:40.000000000 -0400
+++ linux-2.6.21-mm/arch/um/os-Linux/aio.c	2007-04-12 11:47:14.000000000 -0400
@@ -221,6 +221,11 @@ static int init_aio_24(void)
 
 	aio_req_fd_w = fds[0];
 	aio_req_fd_r = fds[1];
+
+	err = os_set_fd_block(aio_req_fd_w, 0);
+	if(err)
+		goto out_close_pipe;
+
 	err = run_helper_thread(not_aio_thread, NULL,
 				CLONE_FILES | CLONE_VM | SIGCHLD, &stack, 0);
 	if(err < 0)
-
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