From: Zhouyang Jia <jiazhouyang09@gmail.com>
Cc: Zhouyang Jia <jiazhouyang09@gmail.com>,
Jason Wessel <jason.wessel@windriver.com>,
Daniel Thompson <daniel.thompson@linaro.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jslaby@suse.com>,
kgdb-bugreport@lists.sourceforge.net,
linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] tty: serial: add error handling for try_module_get
Date: Tue, 12 Jun 2018 12:50:46 +0800 [thread overview]
Message-ID: <1528779046-42341-1-git-send-email-jiazhouyang09@gmail.com> (raw)
When try_module_get fails, the lack of error-handling code may
cause unexpected results.
This patch adds error-handling code after calling try_module_get.
Signed-off-by: Zhouyang Jia <jiazhouyang09@gmail.com>
---
drivers/tty/serial/kgdboc.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/tty/serial/kgdboc.c b/drivers/tty/serial/kgdboc.c
index b4ba2b1..641e22a 100644
--- a/drivers/tty/serial/kgdboc.c
+++ b/drivers/tty/serial/kgdboc.c
@@ -286,8 +286,10 @@ static void kgdboc_pre_exp_handler(void)
con_debug_enter(vc_cons[fg_console].d);
}
/* Increment the module count when the debugger is active */
- if (!kgdb_connected)
- try_module_get(THIS_MODULE);
+ if (!kgdb_connected) {
+ if (!try_module_get(THIS_MODULE))
+ printk(KERN_ERR "kgdboc: cannot get module.\n");
+ }
}
static void kgdboc_post_exp_handler(void)
--
2.7.4
next reply other threads:[~2018-06-12 4:50 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-12 4:50 Zhouyang Jia [this message]
2018-06-12 8:23 ` [PATCH] tty: serial: add error handling for try_module_get Andy Shevchenko
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