On Tue, 11 Jul 2006 14:36:31 -0300
"Naranjo Manuel Francisco" <[EMAIL PROTECTED]> wrote:
| > | +static int aircable_write(struct usb_serial_port *port,
| > | + const unsigned char *source, int
count)
| > | +{
| >
| > [...]
| >
| > | +
| > | + port->write_urb_busy = 1;
| >
| > Shouldn't you protect this with the spinlock?
| You mean making an spinlock before changing the value, and
| a spinunlock after changing the value?
Yes, but I just checked and it seems that all the drivers which uses it
does exactly what you did.
And now I wonder whether they're buggy or not.
| > | +static void aircable_write_bulk_callback (struct urb *urb, struct
pt_regs *regs)
| > | +{
| > | + struct usb_serial_port *port = (struct usb_serial_port
*)urb->context;
| > | +
| > | + /* free up the transfer buffer, as usb_free_urb() does not do this
*/
| > | + kfree(urb->transfer_buffer);
| > | +
| > | + dbg("%s - port %d", __FUNCTION__, port->number);
| > | +
| > | + port->write_urb_busy = 1;
| >
| > What about this one?
| >
| > I think there are others..
| >
| > | +static void aircable_read_bulk_callback(struct urb *urb, struct pt_regs
*regs)
| > | +{
| > | + struct usb_serial_port *port = (struct usb_serial_port
*)urb->context;
| > | + struct usb_serial *serial = port->serial;
| > | + struct tty_struct *tty;
| > | + unsigned char *data;
| > | + unsigned long no_packages;
| > | + unsigned long remaining, package_length;
| > | + unsigned long i;
| > | + int result;
| > | +
| > | + dbg("%s - port %d", __FUNCTION__, port->number);
| > | +
| > | + if (urb->status) {
| > | + dbg("%s - nonzero read bulk status received: %d",
__FUNCTION__,
| > | +
urb->status);
| > | + return;
| > | + }
| >
| > Some other drivers does this, but personally I dislike it.
| >
| > IMO, you can ignore (ie, report with dbg()) -ECONNRESET, -ENOENT
| > and -ESHUTDOWN. But all the others should be reported with err().
| >
| I can't get your point, do you mean in other parts of my code, or for
| other opportunities?
Everytime you check urb->status.
Take a look in my pl2303_read_int_callback():
http://distro2.conectiva.com.br/~lcapitulino/patches/usbserial/2.6.17-rc5/serialcore-port-V0/0011-usbserial-pl2303-Ports-urb-callback-functions.txt
--
Luiz Fernando N. Capitulino
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