1 files changed, 9 insertions, 0 deletions

diff --git a/arch/i386/lib/usercopy.c b/arch/i386/lib/usercopy.c
index d22cfc9d656c..086b3726862a 100644
--- a/arch/i386/lib/usercopy.c
+++ b/arch/i386/lib/usercopy.c
@@ -10,6 +10,7 @@
 #include <linux/blkdev.h>
 #include <linux/module.h>
 #include <linux/backing-dev.h>
+#include <linux/interrupt.h>
 #include <asm/uaccess.h>
 #include <asm/mmx.h>
 
@@ -719,6 +720,14 @@ unsigned long __copy_to_user_ll(void __user *to, const void *from,
 #ifndef CONFIG_X86_WP_WORKS_OK
         if (unlikely(boot_cpu_data.wp_works_ok == 0) &&
                         ((unsigned long )to) < TASK_SIZE) {
+                /*
+                 * When we are in an atomic section (see
+                 * mm/filemap.c:file_read_actor), return the full
+                 * length to take the slow path.
+                 */
+                if (in_atomic())
+                        return n;
+
                 /* 
                  * CPU does not honor the WP bit when writing
                  * from supervisory mode, and due to preemption or SMP,