diff mbox

HID: usbhid: use irqsave() in USB's complete callback

Message ID 20180619215944.13812-1-bigeasy@linutronix.de (mailing list archive)
State New, archived
Headers show

Commit Message

Sebastian Andrzej Siewior June 19, 2018, 9:59 p.m. UTC 
The USB completion callback does not disable interrupts while acquiring
the ->lock. We want to remove the local_irq_disable() invocation from
__usb_hcd_giveback_urb() and therefore it is required for the callback
handler to disable the interrupts while acquiring the lock.
The callback may be invoked either in IRQ or BH context depending on the
USB host controller.
Use the _irqsave() variant of the locking primitives.

Cc: Jiri Kosina <jikos@kernel.org>
Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Cc: linux-input@vger.kernel.org
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/hid/usbhid/hid-core.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

Comments

Jiri Kosina June 25, 2018, 1:25 p.m. UTC | #1 
On Tue, 19 Jun 2018, Sebastian Andrzej Siewior wrote:

> The USB completion callback does not disable interrupts while acquiring
> the ->lock. We want to remove the local_irq_disable() invocation from
> __usb_hcd_giveback_urb() and therefore it is required for the callback
> handler to disable the interrupts while acquiring the lock.
> The callback may be invoked either in IRQ or BH context depending on the
> USB host controller.
> Use the _irqsave() variant of the locking primitives.

Applied, thanks.
diff mbox

Patch

diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index af0e0d061b15..11103efebbaa 100644
--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -480,6 +480,7 @@  static void hid_ctrl(struct urb *urb)
 {
 	struct hid_device *hid = urb->context;
 	struct usbhid_device *usbhid = hid->driver_data;
+	unsigned long flags;
 	int unplug = 0, status = urb->status;
 
 	switch (status) {
@@ -501,7 +502,7 @@  static void hid_ctrl(struct urb *urb)
 		hid_warn(urb->dev, "ctrl urb status %d received\n", status);
 	}
 
-	spin_lock(&usbhid->lock);
+	spin_lock_irqsave(&usbhid->lock, flags);
 
 	if (unplug) {
 		usbhid->ctrltail = usbhid->ctrlhead;
@@ -511,13 +512,13 @@  static void hid_ctrl(struct urb *urb)
 		if (usbhid->ctrlhead != usbhid->ctrltail &&
 				hid_submit_ctrl(hid) == 0) {
 			/* Successfully submitted next urb in queue */
-			spin_unlock(&usbhid->lock);
+			spin_unlock_irqrestore(&usbhid->lock, flags);
 			return;
 		}
 	}
 
 	clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
-	spin_unlock(&usbhid->lock);
+	spin_unlock_irqrestore(&usbhid->lock, flags);
 	usb_autopm_put_interface_async(usbhid->intf);
 	wake_up(&usbhid->wait);
 }