blackfin: sync data in blackfin write buffer

Sync data in blackfin write buffer to DRAM before return from
copy_to_user.
Otherwise, application may read wrong data from stat syscall occasionally.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bob Liu <lliubbo@gmail.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/blackfin/include/asm/uaccess.h b/arch/blackfin/include/asm/uaccess.h
index 461bb542e2e8..57701c3b8a59 100644
--- a/arch/blackfin/include/asm/uaccess.h
+++ b/arch/blackfin/include/asm/uaccess.h
@@ -191,6 +191,7 @@ copy_to_user(void __user *to, const void *from, unsigned long n)
                 memcpy((void __force *)to, from, n);
         else
                 return n;
+        SSYNC();
         return 0;
 }