gpu: host1x: Check for valid host1x pointer

thierryreding · thierryreding · commit 03c961ba6d04 · 2013-09-03T10:10:11.000+02:00
Under rare circumstances it can happen that the host1x driver's .probe()
doesn't finish properly, in which case the device's driver-specific data
will not be set. Instead of crashing in such a situation, propagate the
error to callers of the host1x_get_drm_data() function.

Signed-off-by: Thierry Reding &lt;treding@nvidia.com&gt;
diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c
@@ -43,7 +43,7 @@ void host1x_set_drm_data(struct device *dev, void *data)
 void *host1x_get_drm_data(struct device *dev)
 {
 	struct host1x *host1x = dev_get_drvdata(dev);
-	return host1x->drm_data;
+	return host1x ? host1x->drm_data : NULL;
 }
 
 void host1x_sync_writel(struct host1x *host1x, u32 v, u32 r)

Original file line number	Diff line number	Diff line change
`@@ -43,7 +43,7 @@ void host1x_set_drm_data(struct device dev, void data)`
`43`	`43`	`void host1x_get_drm_data(struct device dev)`
`44`	`44`	`{`
`45`	`45`	`struct host1x *host1x = dev_get_drvdata(dev);`
`46`		`- return host1x->drm_data;`
	`46`	`+ return host1x ? host1x->drm_data : NULL;`
`47`	`47`	`}`
`48`	`48`
`49`	`49`	`void host1x_sync_writel(struct host1x *host1x, u32 v, u32 r)`