platform/x86: i2c-multi-instantiate: Use struct_size() helper

One of the more common cases of allocation size calculations is finding
the size of a structure that has a zero-sized array at the end, along
with memory for some number of elements for that array.

Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>

1 files changed, 1 insertions, 3 deletions

diff --git a/drivers/platform/x86/i2c-multi-instantiate.c b/drivers/platform/x86/i2c-multi-instantiate.c
index 197d8a192721..61fe341a85aa 100644
--- a/drivers/platform/x86/i2c-multi-instantiate.c
+++ b/drivers/platform/x86/i2c-multi-instantiate.c
@@ -81,9 +81,7 @@ static int i2c_multi_inst_probe(struct platform_device *pdev)
         if (ret < 0)
                 return ret;
 
-        multi = devm_kmalloc(dev,
-                        offsetof(struct i2c_multi_inst_data, clients[ret]),
-                        GFP_KERNEL);
+        multi = devm_kmalloc(dev, struct_size(multi, clients, ret), GFP_KERNEL);
         if (!multi)
                 return -ENOMEM;