mfd: Fix aat2870 build failure for x86_64

Without this fix, we get:

error: call to ‘copy_from_user_overflow’ declared with attribute error:
copy_from_user() buffer size is not provably correct
make[3]: *** [drivers/mfd/aat2870-core.o] Error 1

And this was triggered by commit da417bacc9143b934f1a480a25d0fb2bb648a820

Signed-off-by: Jin Park <jinyoungp@nvidia.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

diff --git a/drivers/mfd/aat2870-core.c b/drivers/mfd/aat2870-core.c
index 345dc658ef066399f2ace78c9d299255c837888e..02c42015ba5108344c46cd29986d30e64e5cd304 100644 (file)
--- a/drivers/mfd/aat2870-core.c
+++ b/drivers/mfd/aat2870-core.c
@@ -295,7 +295,7 @@ static ssize_t aat2870_reg_write_file(struct file *file,
 {
        struct aat2870_data *aat2870 = file->private_data;
        char buf[32];
-       int buf_size;
+       ssize_t buf_size;
        char *start = buf;
        unsigned long addr, val;
        int ret;