From stern@rowland.harvard.edu Wed Oct 18 09:35:37 2006 Date: Wed, 18 Oct 2006 12:35:24 -0400 (EDT) From: Alan Stern To: Greg KH cc: Martin Christoph Subject: USB HID: Handle STALL on interrupt endpoint Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII The USB HID driver doesn't include any code to handle a STALL on the interrupt endpoint. While this may be uncommon, it does happen sometimes. This patch (as805) adds a fix. Signed-off-by: Alan Stern Signed-off-by: Greg Kroah-Hartman --- drivers/usb/input/hid-core.c | 37 +++++++++++++++++++++++++------------ drivers/usb/input/hid.h | 1 + 2 files changed, 26 insertions(+), 12 deletions(-) --- gregkh-2.6.orig/drivers/usb/input/hid-core.c +++ gregkh-2.6/drivers/usb/input/hid-core.c @@ -968,20 +968,29 @@ static void hid_retry_timeout(unsigned l hid_io_error(hid); } -/* Workqueue routine to reset the device */ +/* Workqueue routine to reset the device or clear a halt */ static void hid_reset(void *_hid) { struct hid_device *hid = (struct hid_device *) _hid; - int rc_lock, rc; + int rc_lock, rc = 0; - dev_dbg(&hid->intf->dev, "resetting device\n"); - rc = rc_lock = usb_lock_device_for_reset(hid->dev, hid->intf); - if (rc_lock >= 0) { - rc = usb_reset_composite_device(hid->dev, hid->intf); - if (rc_lock) - usb_unlock_device(hid->dev); + if (test_bit(HID_CLEAR_HALT, &hid->iofl)) { + dev_dbg(&hid->intf->dev, "clear halt\n"); + rc = usb_clear_halt(hid->dev, hid->urbin->pipe); + clear_bit(HID_CLEAR_HALT, &hid->iofl); + hid_start_in(hid); + } + + else if (test_bit(HID_RESET_PENDING, &hid->iofl)) { + dev_dbg(&hid->intf->dev, "resetting device\n"); + rc = rc_lock = usb_lock_device_for_reset(hid->dev, hid->intf); + if (rc_lock >= 0) { + rc = usb_reset_composite_device(hid->dev, hid->intf); + if (rc_lock) + usb_unlock_device(hid->dev); + } + clear_bit(HID_RESET_PENDING, &hid->iofl); } - clear_bit(HID_RESET_PENDING, &hid->iofl); switch (rc) { case 0: @@ -1023,9 +1032,8 @@ static void hid_io_error(struct hid_devi /* Retries failed, so do a port reset */ if (!test_and_set_bit(HID_RESET_PENDING, &hid->iofl)) { - if (schedule_work(&hid->reset_work)) - goto done; - clear_bit(HID_RESET_PENDING, &hid->iofl); + schedule_work(&hid->reset_work); + goto done; } } @@ -1049,6 +1057,11 @@ static void hid_irq_in(struct urb *urb) hid->retry_delay = 0; hid_input_report(HID_INPUT_REPORT, urb, 1); break; + case -EPIPE: /* stall */ + clear_bit(HID_IN_RUNNING, &hid->iofl); + set_bit(HID_CLEAR_HALT, &hid->iofl); + schedule_work(&hid->reset_work); + return; case -ECONNRESET: /* unlink */ case -ENOENT: case -ESHUTDOWN: /* unplug */ --- gregkh-2.6.orig/drivers/usb/input/hid.h +++ gregkh-2.6/drivers/usb/input/hid.h @@ -385,6 +385,7 @@ struct hid_control_fifo { #define HID_IN_RUNNING 3 #define HID_RESET_PENDING 4 #define HID_SUSPENDED 5 +#define HID_CLEAR_HALT 6 struct hid_input { struct list_head list;