mirror of https://gitee.com/openkylin/linux.git
hso: Attempt to recover from usb bus errors
Attempt to reset the usb device when we receive usb bus errors. Signed-off-by: Jan Dumon <j.dumon@option.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jan Dumon
David S. Miller
parent
f4763e96c0
commit
68a351c501
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@ -286,6 +286,7 @@ struct hso_device {
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u8 usb_gone;
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struct work_struct async_get_intf;
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struct work_struct async_put_intf;
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struct work_struct reset_device;
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struct usb_device *usb;
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struct usb_interface *interface;
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@ -332,7 +333,8 @@ static void hso_kick_transmit(struct hso_serial *serial);
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/* Helper functions */
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static int hso_mux_submit_intr_urb(struct hso_shared_int *mux_int,
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struct usb_device *usb, gfp_t gfp);
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static void log_usb_status(int status, const char *function);
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static void handle_usb_error(int status, const char *function,
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struct hso_device *hso_dev);
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static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
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int type, int dir);
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static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports);
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@ -350,6 +352,7 @@ static void async_put_intf(struct work_struct *data);
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static int hso_put_activity(struct hso_device *hso_dev);
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static int hso_get_activity(struct hso_device *hso_dev);
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static void tiocmget_intr_callback(struct urb *urb);
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static void reset_device(struct work_struct *data);
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/*****************************************************************************/
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/* Helping functions */
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/*****************************************************************************/
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@ -664,8 +667,8 @@ static void set_serial_by_index(unsigned index, struct hso_serial *serial)
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spin_unlock_irqrestore(&serial_table_lock, flags);
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}
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/* log a meaningful explanation of an USB status */
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static void log_usb_status(int status, const char *function)
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static void handle_usb_error(int status, const char *function,
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struct hso_device *hso_dev)
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{
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char *explanation;
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@ -694,10 +697,20 @@ static void log_usb_status(int status, const char *function)
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case -EMSGSIZE:
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explanation = "internal error";
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break;
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case -EILSEQ:
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case -EPROTO:
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case -ETIME:
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case -ETIMEDOUT:
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explanation = "protocol error";
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if (hso_dev)
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schedule_work(&hso_dev->reset_device);
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break;
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default:
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explanation = "unknown status";
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break;
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}
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/* log a meaningful explanation of an USB status */
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D1("%s: received USB status - %s (%d)", function, explanation, status);
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}
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@ -771,7 +784,7 @@ static void write_bulk_callback(struct urb *urb)
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/* log status, but don't act on it, we don't need to resubmit anything
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* anyhow */
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if (status)
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log_usb_status(status, __func__);
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handle_usb_error(status, __func__, odev->parent);
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hso_put_activity(odev->parent);
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@ -1007,7 +1020,7 @@ static void read_bulk_callback(struct urb *urb)
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/* is al ok? (Filip: Who's Al ?) */
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if (status) {
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log_usb_status(status, __func__);
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handle_usb_error(status, __func__, odev->parent);
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return;
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}
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@ -1217,7 +1230,7 @@ static void hso_std_serial_read_bulk_callback(struct urb *urb)
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D1("serial == NULL");
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return;
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} else if (status) {
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log_usb_status(status, __func__);
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handle_usb_error(status, __func__, serial->parent);
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return;
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}
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@ -1523,7 +1536,7 @@ static void tiocmget_intr_callback(struct urb *urb)
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if (!serial)
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return;
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if (status) {
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log_usb_status(status, __func__);
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handle_usb_error(status, __func__, serial->parent);
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return;
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}
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tiocmget = serial->tiocmget;
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@ -1898,7 +1911,7 @@ static void intr_callback(struct urb *urb)
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/* status check */
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if (status) {
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log_usb_status(status, __func__);
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handle_usb_error(status, __func__, NULL);
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return;
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}
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D4("\n--- Got intr callback 0x%02X ---", status);
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@ -1968,7 +1981,7 @@ static void hso_std_serial_write_bulk_callback(struct urb *urb)
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tty = tty_kref_get(serial->tty);
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spin_unlock(&serial->serial_lock);
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if (status) {
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log_usb_status(status, __func__);
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handle_usb_error(status, __func__, serial->parent);
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tty_kref_put(tty);
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return;
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}
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@ -2024,7 +2037,7 @@ static void ctrl_callback(struct urb *urb)
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tty = tty_kref_get(serial->tty);
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spin_unlock(&serial->serial_lock);
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if (status) {
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log_usb_status(status, __func__);
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handle_usb_error(status, __func__, serial->parent);
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tty_kref_put(tty);
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return;
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}
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@ -2401,6 +2414,7 @@ static struct hso_device *hso_create_device(struct usb_interface *intf,
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INIT_WORK(&hso_dev->async_get_intf, async_get_intf);
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INIT_WORK(&hso_dev->async_put_intf, async_put_intf);
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INIT_WORK(&hso_dev->reset_device, reset_device);
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return hso_dev;
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}
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@ -3143,6 +3157,26 @@ static int hso_resume(struct usb_interface *iface)
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return result;
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}
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static void reset_device(struct work_struct *data)
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{
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struct hso_device *hso_dev =
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container_of(data, struct hso_device, reset_device);
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struct usb_device *usb = hso_dev->usb;
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int result;
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if (hso_dev->usb_gone) {
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D1("No reset during disconnect\n");
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} else {
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result = usb_lock_device_for_reset(usb, hso_dev->interface);
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if (result < 0)
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D1("unable to lock device for reset: %d\n", result);
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else {
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usb_reset_device(usb);
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usb_unlock_device(usb);
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}
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}
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}
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static void hso_serial_ref_free(struct kref *ref)
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{
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struct hso_device *hso_dev = container_of(ref, struct hso_device, ref);
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