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Message-Id: <1233908877-7729-1-git-send-email-cooloney@kernel.org>
Date: Fri, 6 Feb 2009 16:27:57 +0800
From: Bryan Wu <cooloney@...nel.org>
To: alan@...rguk.ukuu.org.uk
Cc: linux-kernel@...r.kernel.org, Sonic Zhang <sonic.zhang@...log.com>,
Bryan Wu <cooloney@...nel.org>
Subject: [PATCH] tty: fix bug - kernel can't be pinged through when bootargs console=null
From: Sonic Zhang <sonic.zhang@...log.com>
when pass bootargs console=null into kernel from u-boot, the booted up
kernel can't be pinged through. This happens after the kernel is upgraded
to 2.6.28.
Should check if tty_driver is NULL before call kref_get() in tty_driver_kref_get().
Signed-off-by: Sonic Zhang <sonic.zhang@...log.com>
Signed-off-by: Bryan Wu <cooloney@...nel.org>
---
include/linux/tty_driver.h | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h
index 08e0883..2a602a8 100644
--- a/include/linux/tty_driver.h
+++ b/include/linux/tty_driver.h
@@ -312,7 +312,8 @@ extern struct tty_driver *tty_find_polling_driver(char *name, int *line);
extern void tty_driver_kref_put(struct tty_driver *driver);
extern inline struct tty_driver *tty_driver_kref_get(struct tty_driver *d)
{
- kref_get(&d->kref);
+ if (d)
+ kref_get(&d->kref);
return d;
}
--
1.5.6.3
--
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