udlfb: Fix invalid return codes in edid sysfs entry store function
Return a negative errno instead of zero in the write function of
the sysfs entry in case of error.
Also add a check on the return value of dlfb_setup_modes().
Signed-off-by: Olivier Sobrie <olivier@sobrie.be>
Acked-by: Bernie Thompson <bernie@plugable.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
diff --git a/drivers/video/udlfb.c b/drivers/video/udlfb.c
index 86c8b25..157df78 100644
--- a/drivers/video/udlfb.c
+++ b/drivers/video/udlfb.c
@@ -1432,19 +1432,22 @@
struct device *fbdev = container_of(kobj, struct device, kobj);
struct fb_info *fb_info = dev_get_drvdata(fbdev);
struct dlfb_data *dev = fb_info->par;
+ int ret;
/* We only support write of entire EDID at once, no offset*/
if ((src_size != EDID_LENGTH) || (src_off != 0))
- return 0;
+ return -EINVAL;
- dlfb_setup_modes(dev, fb_info, src, src_size);
+ ret = dlfb_setup_modes(dev, fb_info, src, src_size);
+ if (ret)
+ return ret;
- if (dev->edid && (memcmp(src, dev->edid, src_size) == 0)) {
- pr_info("sysfs written EDID is new default\n");
- dlfb_ops_set_par(fb_info);
- return src_size;
- } else
- return 0;
+ if (!dev->edid || memcmp(src, dev->edid, src_size))
+ return -EINVAL;
+
+ pr_info("sysfs written EDID is new default\n");
+ dlfb_ops_set_par(fb_info);
+ return src_size;
}
static ssize_t metrics_reset_store(struct device *fbdev,