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HID: usbhid: remove custom locking from usbhid_open/close
Now that HID core enforces serialization of transport driver open/close calls we can remove custom locking from usbhid driver. Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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85ae911331
commit
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1 changed files with 52 additions and 61 deletions
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@ -70,8 +70,6 @@ MODULE_PARM_DESC(quirks, "Add/modify USB HID quirks by specifying "
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/*
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* Input submission and I/O error handler.
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*/
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static DEFINE_MUTEX(hid_open_mut);
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static void hid_io_error(struct hid_device *hid);
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static int hid_submit_out(struct hid_device *hid);
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static int hid_submit_ctrl(struct hid_device *hid);
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@ -680,21 +678,22 @@ static int hid_get_class_descriptor(struct usb_device *dev, int ifnum,
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static int usbhid_open(struct hid_device *hid)
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{
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struct usbhid_device *usbhid = hid->driver_data;
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int res = 0;
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int res;
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if (hid->quirks & HID_QUIRK_ALWAYS_POLL)
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return 0;
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mutex_lock(&hid_open_mut);
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if (!hid->open++) {
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res = usb_autopm_get_interface(usbhid->intf);
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/* the device must be awake to reliably request remote wakeup */
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if (res < 0) {
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hid->open--;
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res = -EIO;
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goto done;
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}
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if (res < 0)
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return -EIO;
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usbhid->intf->needs_remote_wakeup = 1;
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set_bit(HID_RESUME_RUNNING, &usbhid->iofl);
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set_bit(HID_OPENED, &usbhid->iofl);
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set_bit(HID_IN_POLLING, &usbhid->iofl);
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set_bit(HID_RESUME_RUNNING, &usbhid->iofl);
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res = hid_start_in(hid);
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if (res) {
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if (res != -ENOSPC) {
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@ -702,14 +701,13 @@ static int usbhid_open(struct hid_device *hid)
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res = 0;
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} else {
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/* no use opening if resources are insufficient */
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hid->open--;
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clear_bit(HID_OPENED, &usbhid->iofl);
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if (!(hid->quirks & HID_QUIRK_ALWAYS_POLL))
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clear_bit(HID_IN_POLLING, &usbhid->iofl);
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res = -EBUSY;
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clear_bit(HID_OPENED, &usbhid->iofl);
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clear_bit(HID_IN_POLLING, &usbhid->iofl);
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usbhid->intf->needs_remote_wakeup = 0;
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}
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}
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usb_autopm_put_interface(usbhid->intf);
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/*
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@ -718,12 +716,10 @@ static int usbhid_open(struct hid_device *hid)
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* Wait 50 msec for the queue to empty before allowing events
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* to go through hid.
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*/
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if (res == 0 && !(hid->quirks & HID_QUIRK_ALWAYS_POLL))
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if (res == 0)
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msleep(50);
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clear_bit(HID_RESUME_RUNNING, &usbhid->iofl);
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}
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done:
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mutex_unlock(&hid_open_mut);
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return res;
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}
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@ -731,27 +727,22 @@ static void usbhid_close(struct hid_device *hid)
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{
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struct usbhid_device *usbhid = hid->driver_data;
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mutex_lock(&hid_open_mut);
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if (hid->quirks & HID_QUIRK_ALWAYS_POLL)
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return;
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/* protecting hid->open to make sure we don't restart
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* data acquistion due to a resumption we no longer
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* care about
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/*
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* Make sure we don't restart data acquisition due to
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* a resumption we no longer care about by avoiding racing
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* with hid_start_in().
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*/
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spin_lock_irq(&usbhid->lock);
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if (!--hid->open) {
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if (!(hid->quirks & HID_QUIRK_ALWAYS_POLL))
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clear_bit(HID_IN_POLLING, &usbhid->iofl);
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clear_bit(HID_OPENED, &usbhid->iofl);
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spin_unlock_irq(&usbhid->lock);
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hid_cancel_delayed_stuff(usbhid);
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if (!(hid->quirks & HID_QUIRK_ALWAYS_POLL)) {
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usb_kill_urb(usbhid->urbin);
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usbhid->intf->needs_remote_wakeup = 0;
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}
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} else {
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spin_unlock_irq(&usbhid->lock);
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}
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mutex_unlock(&hid_open_mut);
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}
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/*
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