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Date: Tue, 5 Jan 2010 15:52:13 +0100
From: Jan Dumon <j.dumon@...ion.com>
To: linux-usb@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH 4/6] hso: Attempt to recover from usb bus errors
From: Jan Dumon <j.dumon@...ion.com>
Attempt to reset the usb device when we receive usb bus errors.
Signed-off-by: Jan Dumon <j.dumon@...ion.com>
--- linux-2.6.orig/drivers/net/usb/hso.c
+++ linux-2.6/drivers/net/usb/hso.c
@@ -286,6 +286,7 @@ struct hso_device {
u8 usb_gone;
struct work_struct async_get_intf;
struct work_struct async_put_intf;
+ struct work_struct reset_device;
struct usb_device *usb;
struct usb_interface *interface;
@@ -332,7 +333,8 @@ static void hso_kick_transmit(struct hso
/* Helper functions */
static int hso_mux_submit_intr_urb(struct hso_shared_int *mux_int,
struct usb_device *usb, gfp_t gfp);
-static void log_usb_status(int status, const char *function);
+static void handle_usb_error(int status, const char *function,
+ struct hso_device *hso_dev);
static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
int type, int dir);
static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports);
@@ -350,6 +352,7 @@ static void async_put_intf(struct work_s
static int hso_put_activity(struct hso_device *hso_dev);
static int hso_get_activity(struct hso_device *hso_dev);
static void tiocmget_intr_callback(struct urb *urb);
+static void reset_device(struct work_struct *data);
/*****************************************************************************/
/* Helping functions */
/*****************************************************************************/
@@ -664,8 +667,8 @@ static void set_serial_by_index(unsigned
spin_unlock_irqrestore(&serial_table_lock, flags);
}
-/* log a meaningful explanation of an USB status */
-static void log_usb_status(int status, const char *function)
+static void handle_usb_error(int status, const char *function,
+ struct hso_device *hso_dev)
{
char *explanation;
@@ -694,10 +697,20 @@ static void log_usb_status(int status, c
case -EMSGSIZE:
explanation = "internal error";
break;
+ case -EILSEQ:
+ case -EPROTO:
+ case -ETIME:
+ case -ETIMEDOUT:
+ explanation = "protocol error";
+ if (hso_dev)
+ schedule_work(&hso_dev->reset_device);
+ break;
default:
explanation = "unknown status";
break;
}
+
+ /* log a meaningful explanation of an USB status */
D1("%s: received USB status - %s (%d)", function, explanation, status);
}
@@ -771,7 +784,7 @@ static void write_bulk_callback(struct u
/* log status, but don't act on it, we don't need to resubmit anything
* anyhow */
if (status)
- log_usb_status(status, __func__);
+ handle_usb_error(status, __func__, odev->parent);
hso_put_activity(odev->parent);
@@ -1007,7 +1020,7 @@ static void read_bulk_callback(struct ur
/* is al ok? (Filip: Who's Al ?) */
if (status) {
- log_usb_status(status, __func__);
+ handle_usb_error(status, __func__, odev->parent);
return;
}
@@ -1217,7 +1230,7 @@ static void hso_std_serial_read_bulk_cal
D1("serial == NULL");
return;
} else if (status) {
- log_usb_status(status, __func__);
+ handle_usb_error(status, __func__, serial->parent);
return;
}
@@ -1523,7 +1536,7 @@ static void tiocmget_intr_callback(struc
if (!serial)
return;
if (status) {
- log_usb_status(status, __func__);
+ handle_usb_error(status, __func__, serial->parent);
return;
}
tiocmget = serial->tiocmget;
@@ -1898,7 +1911,7 @@ static void intr_callback(struct urb *ur
/* status check */
if (status) {
- log_usb_status(status, __func__);
+ handle_usb_error(status, __func__, NULL);
return;
}
D4("\n--- Got intr callback 0x%02X ---", status);
@@ -1968,7 +1981,7 @@ static void hso_std_serial_write_bulk_ca
tty = tty_kref_get(serial->tty);
spin_unlock(&serial->serial_lock);
if (status) {
- log_usb_status(status, __func__);
+ handle_usb_error(status, __func__, serial->parent);
tty_kref_put(tty);
return;
}
@@ -2024,7 +2037,7 @@ static void ctrl_callback(struct urb *ur
tty = tty_kref_get(serial->tty);
spin_unlock(&serial->serial_lock);
if (status) {
- log_usb_status(status, __func__);
+ handle_usb_error(status, __func__, serial->parent);
tty_kref_put(tty);
return;
}
@@ -2401,6 +2414,7 @@ static struct hso_device *hso_create_dev
INIT_WORK(&hso_dev->async_get_intf, async_get_intf);
INIT_WORK(&hso_dev->async_put_intf, async_put_intf);
+ INIT_WORK(&hso_dev->reset_device, reset_device);
return hso_dev;
}
@@ -3143,6 +3157,26 @@ out:
return result;
}
+static void reset_device(struct work_struct *data)
+{
+ struct hso_device *hso_dev =
+ container_of(data, struct hso_device, reset_device);
+ struct usb_device *usb = hso_dev->usb;
+ int result;
+
+ if (hso_dev->usb_gone) {
+ D1("No reset during disconnect\n");
+ } else {
+ result = usb_lock_device_for_reset(usb, hso_dev->interface);
+ if (result < 0)
+ D1("unable to lock device for reset: %d\n", result);
+ else {
+ usb_reset_device(usb);
+ usb_unlock_device(usb);
+ }
+ }
+}
+
static void hso_serial_ref_free(struct kref *ref)
{
struct hso_device *hso_dev = container_of(ref, struct hso_device, ref);
--
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