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authorUwe Kleine-König <u.kleine-koenig@pengutronix.de>2011-12-15 09:16:34 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2012-01-04 16:30:34 -0800
commit20bb8095a467dde88bd09a55ed62c60fada2e5c9 (patch)
treed4c387d24cb5a4731c9a0427598e3374710c6732 /drivers/tty
parenta197a191f73a75d80d5b67e09e0b89c214dc3690 (diff)
downloadlinux-20bb8095a467dde88bd09a55ed62c60fada2e5c9.tar.bz2
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 <u.kleine-koenig@pengutronix.de> Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/imx.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 2813f0210377..92a5987924cf 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) {