Merge tag 'platform-drivers-x86-v4.12-2' of git://git.infradead.org/linux-platform...

[karo-tx-linux.git] / drivers / usb / gadget / function / f_mass_storage.c

diff --git a/drivers/usb/gadget/function/f_mass_storage.c b/drivers/usb/gadget/function/f_mass_storage.c
index 4c8aacc232c07b300b5efffebe25999f8d9d244c..74d57d6994da1602ad72798aabc922ecbea9a0b1 100644 (file)
--- a/drivers/usb/gadget/function/f_mass_storage.c
+++ b/drivers/usb/gadget/function/f_mass_storage.c
@@ -396,7 +396,11 @@ static int fsg_set_halt(struct fsg_dev *fsg, struct usb_ep *ep)
 /* Caller must hold fsg->lock */
 static void wakeup_thread(struct fsg_common *common)
 {
-       smp_wmb();      /* ensure the write of bh->state is complete */
+       /*
+        * Ensure the reading of thread_wakeup_needed
+        * and the writing of bh->state are completed
+        */
+       smp_mb();
        /* Tell the main thread that something has happened */
        common->thread_wakeup_needed = 1;
        if (common->thread_task)
@@ -627,7 +631,12 @@ static int sleep_thread(struct fsg_common *common, bool can_freeze)
        }
        __set_current_state(TASK_RUNNING);
        common->thread_wakeup_needed = 0;
-       smp_rmb();      /* ensure the latest bh->state is visible */
+
+       /*
+        * Ensure the writing of thread_wakeup_needed
+        * and the reading of bh->state are completed
+        */
+       smp_mb();
        return rc;
 }