diff options
| -rw-r--r-- | drivers/usb/host/xhci-ring.c | 3 | ||||
| -rw-r--r-- | drivers/usb/host/xhci.c | 3 |
2 files changed, 6 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index d2002ecd27b0..4a4410f7978f 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -3087,6 +3087,9 @@ static void xhci_clear_interrupt_pending(struct xhci_interrupter *ir) irq_pending = readl(&ir->ir_set->irq_pending); irq_pending |= IMAN_IP; writel(irq_pending, &ir->ir_set->irq_pending); + + /* Read operation to guarantee the write has been flushed from posted buffers */ + readl(&ir->ir_set->irq_pending); } } diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 472589679af3..8cdb1a01a3ed 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -335,6 +335,8 @@ int xhci_enable_interrupter(struct xhci_interrupter *ir) iman |= IMAN_IE; writel(iman, &ir->ir_set->irq_pending); + /* Read operation to guarantee the write has been flushed from posted buffers */ + readl(&ir->ir_set->irq_pending); return 0; } @@ -350,6 +352,7 @@ int xhci_disable_interrupter(struct xhci_interrupter *ir) iman &= ~IMAN_IE; writel(iman, &ir->ir_set->irq_pending); + readl(&ir->ir_set->irq_pending); return 0; } |