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drivers/input/serio/hp_sdc.c: fix crash when removing hp_sdc module 

On parisc machines, which don't have HIL, removing the hp_sdc module
panics the kernel.  Fix this by returning early in hp_sdc_exit() if no HP
SDC controller was found.

Add functionality to probe for the hp_sdc_mlc kernel module (which takes
care of the upper layer HIL functionality on parisc) after two seconds.
This is needed to get all the other HIL drivers (keyboard / mouse/ ..)
drivers automatically loaded by udev later as well.

Signed-off-by: Helge Deller <deller@gmx.de>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Frans Pop <elendil@planet.nl>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Grant Grundler <grundler@parisc-linux.org>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Helge Deller 2009-04-21 12:24:42 -07:00 committed by Linus Torvalds
parent e638c13940
commit aa0b8f3687
1 changed files with 23 additions and 1 deletions
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24
drivers/input/serio/hp_sdc.c
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@ -819,6 +819,7 @@ static const struct parisc_device_id hp_sdc_tbl[] = {
MODULE_DEVICE_TABLE(parisc, hp_sdc_tbl);
static int __init hp_sdc_init_hppa(struct parisc_device *d);
static struct delayed_work moduleloader_work;
static struct parisc_driver hp_sdc_driver = {
.name = "hp_sdc",
@ -930,8 +931,15 @@ static int __init hp_sdc_init(void)
#if defined(__hppa__)
static void request_module_delayed(struct work_struct *work)
{
request_module("hp_sdc_mlc");
}
static int __init hp_sdc_init_hppa(struct parisc_device *d)
{
int ret;
if (!d)
return 1;
if (hp_sdc.dev != NULL)
@ -944,13 +952,26 @@ static int __init hp_sdc_init_hppa(struct parisc_device *d)
hp_sdc.data_io = d->hpa.start + 0x800;
hp_sdc.status_io = d->hpa.start + 0x801;
return hp_sdc_init();
INIT_DELAYED_WORK(&moduleloader_work, request_module_delayed);
ret = hp_sdc_init();
/* after sucessfull initialization give SDC some time to settle
* and then load the hp_sdc_mlc upper layer driver */
if (!ret)
schedule_delayed_work(&moduleloader_work,
msecs_to_jiffies(2000));
return ret;
}
#endif /* __hppa__ */
static void hp_sdc_exit(void)
{
/* do nothing if we don't have a SDC */
if (!hp_sdc.dev)
return;
write_lock_irq(&hp_sdc.lock);
/* Turn off all maskable "sub-function" irq's. */
@ -969,6 +990,7 @@ static void hp_sdc_exit(void)
tasklet_kill(&hp_sdc.task);
#if defined(__hppa__)
cancel_delayed_work_sync(&moduleloader_work);
if (unregister_parisc_driver(&hp_sdc_driver))
printk(KERN_WARNING PREFIX "Error unregistering HP SDC");
#endif