From: Jeff Dike <jdike@addtoit.com>
To: Andrew Morton <akpm@osdl.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
uml-devel <user-mode-linux-devel@lists.sourceforge.net>,
Karol Swietlicki <magotari@gmail.com>
Subject: [uml-devel] [PATCH 15/20] UML - Fix infinite mconsole loop
Date: Thu, 17 Jan 2008 16:40:46 -0500 [thread overview]
Message-ID: <20080117214046.GA6762@c2.user-mode-linux.org> (raw)
From: Karol Swietlicki <magotari@gmail.com>
This patch takes care of a problem with the stopping code.
The function inside the while condition returns 0 to signify a problem.
A problem could be for example a bad command or a bad version of the
mconsole client.
A bad command would terminate the stopping loop and resume the kernel.
This is a problem.
A better solution is to make the loop infinite and don't leave it
until we are explicitly told to.
Signed-off-by: Karol Swietlicki <magotari@gmail.com>
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
---
arch/um/drivers/mconsole_kern.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
Index: linux-2.6.22/arch/um/drivers/mconsole_kern.c
===================================================================
--- linux-2.6.22.orig/arch/um/drivers/mconsole_kern.c 2007-12-12 13:44:20.000000000 -0500
+++ linux-2.6.22/arch/um/drivers/mconsole_kern.c 2007-12-12 15:53:08.000000000 -0500
@@ -305,7 +305,9 @@ void mconsole_stop(struct mc_request *re
deactivate_fd(req->originating_fd, MCONSOLE_IRQ);
os_set_fd_block(req->originating_fd, 1);
mconsole_reply(req, "stopped", 0, 0);
- while (mconsole_get_request(req->originating_fd, req)) {
+ for (;;) {
+ if (!mconsole_get_request(req->originating_fd, req))
+ continue;
if (req->cmd->handler == mconsole_go)
break;
if (req->cmd->handler == mconsole_stop) {
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WARNING: multiple messages have this Message-ID (diff)
From: Jeff Dike <jdike@addtoit.com>
To: Andrew Morton <akpm@osdl.org>
Cc: Karol Swietlicki <magotari@gmail.com>,
uml-devel <user-mode-linux-devel@lists.sourceforge.net>,
LKML <linux-kernel@vger.kernel.org>
Subject: [PATCH 15/20] UML - Fix infinite mconsole loop
Date: Thu, 17 Jan 2008 16:40:46 -0500 [thread overview]
Message-ID: <20080117214046.GA6762@c2.user-mode-linux.org> (raw)
From: Karol Swietlicki <magotari@gmail.com>
This patch takes care of a problem with the stopping code.
The function inside the while condition returns 0 to signify a problem.
A problem could be for example a bad command or a bad version of the
mconsole client.
A bad command would terminate the stopping loop and resume the kernel.
This is a problem.
A better solution is to make the loop infinite and don't leave it
until we are explicitly told to.
Signed-off-by: Karol Swietlicki <magotari@gmail.com>
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
---
arch/um/drivers/mconsole_kern.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
Index: linux-2.6.22/arch/um/drivers/mconsole_kern.c
===================================================================
--- linux-2.6.22.orig/arch/um/drivers/mconsole_kern.c 2007-12-12 13:44:20.000000000 -0500
+++ linux-2.6.22/arch/um/drivers/mconsole_kern.c 2007-12-12 15:53:08.000000000 -0500
@@ -305,7 +305,9 @@ void mconsole_stop(struct mc_request *re
deactivate_fd(req->originating_fd, MCONSOLE_IRQ);
os_set_fd_block(req->originating_fd, 1);
mconsole_reply(req, "stopped", 0, 0);
- while (mconsole_get_request(req->originating_fd, req)) {
+ for (;;) {
+ if (!mconsole_get_request(req->originating_fd, req))
+ continue;
if (req->cmd->handler == mconsole_go)
break;
if (req->cmd->handler == mconsole_stop) {
next reply other threads:[~2008-01-17 21:41 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-17 21:40 Jeff Dike [this message]
2008-01-17 21:40 ` [PATCH 15/20] UML - Fix infinite mconsole loop Jeff Dike
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