From: Uwe Kleine-König Date: Thu, 15 Dec 2011 08:16:34 +0000 (+0100) Subject: serial/imx: let probing fail for the dt case without a valid alias X-Git-Tag: v3.3-rc1~154^2~3 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=20bb8095a467dde88bd09a55ed62c60fada2e5c9;p=profile%2Fivi%2Fkernel-x86-ivi.git serial/imx: let probing fail for the dt case without a valid alias When the uart device is instantiated by dt but dt doesn't provide an alias then better let probing fail instead of falling back to an unrelated device id used for the line number and no platform data. Signed-off-by: Uwe Kleine-König Signed-off-by: Shawn Guo Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 2813f02..92a5987 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -1302,6 +1302,10 @@ static int serial_imx_resume(struct platform_device *dev) } #ifdef CONFIG_OF +/* + * This function returns 1 iff pdev isn't a device instatiated by dt, 0 iff it + * could successfully get all information from dt or a negative errno. + */ static int serial_imx_probe_dt(struct imx_port *sport, struct platform_device *pdev) { @@ -1311,7 +1315,8 @@ static int serial_imx_probe_dt(struct imx_port *sport, int ret; if (!np) - return -ENODEV; + /* no device tree device */ + return 1; ret = of_alias_get_id(np, "serial"); if (ret < 0) { @@ -1334,7 +1339,7 @@ static int serial_imx_probe_dt(struct imx_port *sport, static inline int serial_imx_probe_dt(struct imx_port *sport, struct platform_device *pdev) { - return -ENODEV; + return 1; } #endif @@ -1369,8 +1374,10 @@ static int serial_imx_probe(struct platform_device *pdev) return -ENOMEM; ret = serial_imx_probe_dt(sport, pdev); - if (ret == -ENODEV) + if (ret > 0) serial_imx_probe_pdata(sport, pdev); + else if (ret < 0) + goto free; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) {