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USB: serial: sierra driver read path bug fix

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This patch fixes a problem in function sierra_indat_callback() which
would stop receiving traffic from a modem if a number of URB failures
occur.  Failed URBs are not resubmitted for the next read and there is
only a limited number of URBs allocated for the IN path. After this
number of failures, the receive path stops working on a particular
interface.

Signed-off-by: Elina Pasheva <epasheva@sierrawireless.com>
This commit is contained in:
Elina Pasheva 2009-04-29 10:29:21 -07:00 committed by Greg Kroah-Hartman
parent 40d2ff32f1
commit b0cda8c5f7
1 changed files with 17 additions and 11 deletions
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28
drivers/usb/serial/sierra.c
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@ -509,10 +509,10 @@ static void sierra_indat_callback(struct urb *urb)
unsigned char *data = urb->transfer_buffer;
int status = urb->status;
dbg("%s: %p", __func__, urb);
endpoint = usb_pipeendpoint(urb->pipe);
port = urb->context;
port = urb->context;
dev_dbg(&port->dev, "%s: %p\n", __func__, urb);
if (status) {
dev_dbg(&port->dev, "%s: nonzero status: %d on"
@ -520,22 +520,28 @@ static void sierra_indat_callback(struct urb *urb)
} else {
if (urb->actual_length) {
tty = tty_port_tty_get(&port->port);
tty_buffer_request_room(tty, urb->actual_length);
tty_insert_flip_string(tty, data, urb->actual_length);
tty_flip_buffer_push(tty);
tty_kref_put(tty);
} else
usb_serial_debug_data(debug, &port->dev, __func__,
urb->actual_length, data);
} else {
dev_dbg(&port->dev, "%s: empty read urb"
" received\n", __func__);
/* Resubmit urb so we continue receiving */
if (port->port.count && status != -ESHUTDOWN && status != -EPERM) {
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err)
dev_err(&port->dev, "resubmit read urb failed."
"(%d)\n", err);
}
}
/* Resubmit urb so we continue receiving */
if (port->port.count && status != -ESHUTDOWN && status != -EPERM) {
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err)
dev_err(&port->dev, "resubmit read urb failed."
"(%d)\n", err);
}
return;
}