of: fix of_device_get_modalias returned length when truncating buffers

If the length of the modalias is greater than the buffer size, then the
modalias is truncated. However the untruncated length is returned which
will cause an error. Fix this to return the truncated length. If an error
in the case was desired, then then we should just return -ENOMEM.

The reality is no device will ever have 4KB of compatible strings to hit
this case.

Signed-off-by: Rob Herring <robh@kernel.org>
Cc: Frank Rowand <frowand.list@gmail.com>

diff --git a/drivers/of/device.c b/drivers/of/device.c
index b1e6bebda3f3a0ebee3b09085b6bb1a500f6249e..210432a3c4ecc739fb0cf0fdf443c9f77e683082 100644 (file)
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -223,7 +223,7 @@ ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len)
                        str[i] = '_';
        }
 
-       return tsize;
+       return repend;
 }
 EXPORT_SYMBOL_GPL(of_device_get_modalias);