diff options
| author |   Helge Deller <deller@gmx.de> | 2009-04-21 12:24:42 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-21 13:41:49 -0700 |
| commit | aa0b8f3687f06ac0e5a2b24547fdf431e923c475 (patch) | |
| tree | 94150412078aeb2e32c9927b13e0cd0a60a1aac0 /drivers/input/serio/hp_sdc.c | |
| parent | memcg: use rcu_dereference to access mm->owner (diff) | |
| download | linux-dev-aa0b8f3687f06ac0e5a2b24547fdf431e923c475.tar.xz linux-dev-aa0b8f3687f06ac0e5a2b24547fdf431e923c475.zip | |
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>
Diffstat (limited to 'drivers/input/serio/hp_sdc.c')
| -rw-r--r-- | drivers/input/serio/hp_sdc.c | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/drivers/input/serio/hp_sdc.c b/drivers/input/serio/hp_sdc.c index bfe49243f38b..1c9410d1822c 100644 --- a/drivers/input/serio/hp_sdc.c +++ b/drivers/input/serio/hp_sdc.c @@ -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 |