ARM: software-based priviledged-no-access support

[firefly-linux-kernel-4.4.55.git] / arch / arm / kernel / swp_emulate.c

diff --git a/arch/arm/kernel/swp_emulate.c b/arch/arm/kernel/swp_emulate.c
index 1361756782c73b49c499f50bc4f423647e2edd3f..5b26e7efa9ea415967b63ede27ab1edf2bc8e888 100644 (file)
--- a/arch/arm/kernel/swp_emulate.c
+++ b/arch/arm/kernel/swp_emulate.c
@@ -141,11 +141,14 @@ static int emulate_swpX(unsigned int address, unsigned int *data,
 
        while (1) {
                unsigned long temp;
+               unsigned int __ua_flags;
 
+               __ua_flags = uaccess_save_and_enable();
                if (type == TYPE_SWPB)
                        __user_swpb_asm(*data, address, res, temp);
                else
                        __user_swp_asm(*data, address, res, temp);
+               uaccess_restore(__ua_flags);
 
                if (likely(res != -EAGAIN) || signal_pending(current))
                        break;