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USB: stop io performed by mos7720 upon close()

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This fixes a problem where the mos7720 driver will make io to a device from
which it has been logically disconnected. It does so by introducing a flag by
which the generic usb serial code can signal the subdrivers their
disconnection and appropriate locking.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Oliver Neukum 2008-01-16 17:18:52 +01:00 • committed by Greg Kroah-Hartman
commit a1cd7e99b3
3 changed files with 34 additions and 29 deletions
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2
include/linux/usb/serial.h
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@ -129,6 +129,7 @@ struct usb_serial {
struct usb_device * dev;
struct usb_serial_driver * type;
struct usb_interface * interface;
unsigned char disconnected;
unsigned char minor;
unsigned char num_ports;
unsigned char num_port_pointers;
@ -138,6 +139,7 @@ struct usb_serial {
char num_bulk_out;
struct usb_serial_port * port[MAX_NUM_PORTS];
struct kref kref;
struct mutex disc_mutex;
void * private;
};
#define to_usb_serial(d) container_of(d, struct usb_serial, kref)