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parport: quickfix the proc registration bug 

Ideally we should have a directory of drivers and a link to the 'active'
driver. For now just show the first device which is effectively the existing
semantics without a warning.

This is an update on the original buggy patch that I then forgot to
resubmit. Confusingly it was proposed by Red Hat, written by Etched Pixels
fixed and submitted by Intel ...

Resolves-Bug: http://bugzilla.kernel.org/show_bug.cgi?id=9749
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alan Cox 2009-06-02 16:58:10 +01:00 committed by Linus Torvalds
parent d3ae33efb8
commit 05ad709d04
2 changed files with 14 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/parport/share.c
View File

@ -614,7 +614,10 @@ parport_register_device(struct parport *port, const char *name,
* pardevice fields. -arca
*/
port->ops->init_state(tmp, tmp->state);
parport_device_proc_register(tmp);
if (!test_and_set_bit(PARPORT_DEVPROC_REGISTERED, &port->devflags)) {
port->proc_device = tmp;
parport_device_proc_register(tmp);
}
return tmp;
out_free_all:
@ -646,10 +649,14 @@ void parport_unregister_device(struct pardevice *dev)
}
#endif
parport_device_proc_unregister(dev);
port = dev->port->physport;
if (port->proc_device == dev) {
port->proc_device = NULL;
clear_bit(PARPORT_DEVPROC_REGISTERED, &port->devflags);
parport_device_proc_unregister(dev);
}
if (port->cad == dev) {
printk(KERN_DEBUG "%s: %s forgot to release port\n",
port->name, dev->name);

4
include/linux/parport.h
View File

@ -324,6 +324,10 @@ struct parport {
int spintime;
atomic_t ref_count;
unsigned long devflags;
#define PARPORT_DEVPROC_REGISTERED 0
struct pardevice *proc_device; /* Currently register proc device */
struct list_head full_list;
struct parport *slaves[3];
};