linux-kernel - [ 27/33] tty: serial: vt8500: fix return value check in vt8500_serial

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Date:	Fri, 18 Jan 2013 17:16:52 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk,
	Wei Yongjun <yongjun_wei@...ndmicro.com.cn>,
	Tony Prisk <linux@...sktech.co.nz>
Subject: [ 27/33] tty: serial: vt8500: fix return value check in vt8500_serial_probe()

3.7-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>

commit a6dd114e16cbc4410049a90a8a67b967333d108d upstream.

In case of error, function of_clk_get() returns ERR_PTR()
and never returns NULL. The NULL test in the return value
check should be replaced with IS_ERR().

Signed-off-by: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
Acked-by: Tony Prisk <linux@...sktech.co.nz>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/tty/serial/vt8500_serial.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/tty/serial/vt8500_serial.c
+++ b/drivers/tty/serial/vt8500_serial.c
@@ -604,7 +604,7 @@ static int __devinit vt8500_serial_probe
 	vt8500_port->uart.flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
 
 	vt8500_port->clk = of_clk_get(pdev->dev.of_node, 0);
-	if (vt8500_port->clk) {
+	if (!IS_ERR(vt8500_port->clk)) {
 		vt8500_port->uart.uartclk = clk_get_rate(vt8500_port->clk);
 	} else {
 		/* use the default of 24Mhz if not specified and warn */


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