Hi,
it turns out that tty_open() calls close() even if open() has failed.
As this is undesireable for usb serial drivers, here's a patch
to deal with it.
John, does it fix the issue you reported?
Regards
Oliver
--
--- a/include/linux/usb/serial.h 2007-03-26 09:23:20.000000000 +0200
+++ b/include/linux/usb/serial.h 2007-03-26 09:27:12.000000000 +0200
@@ -92,6 +92,7 @@
int open_count;
char throttled;
char throttle_req;
+ int cleaning_up;
struct device dev;
};
#define to_usb_serial_port(d) container_of(d, struct usb_serial_port, dev)
--- a/drivers/usb/serial/usb-serial.c 2007-03-26 09:18:08.000000000 +0200
+++ b/drivers/usb/serial/usb-serial.c 2007-03-26 09:28:14.000000000 +0200
@@ -235,6 +235,7 @@
return 0;
bailout_module_put:
+ ++port->cleaning_up;
module_put(serial->type->driver.owner);
bailout_mutex_unlock:
port->open_count = 0;
@@ -257,6 +258,12 @@
mutex_lock(&port->mutex);
+ if (port->cleaning_up) {
+ --port->cleaning_up;
+ mutex_unlock(&port->mutex);
+ return;
+ }
+
if (port->open_count == 0) {
mutex_unlock(&port->mutex);
return;
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