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>
diff --git a/drivers/input/serio/hp_sdc.c b/drivers/input/serio/hp_sdc.c
index bfe4924..1c9410d 100644
--- a/drivers/input/serio/hp_sdc.c
+++ b/drivers/input/serio/hp_sdc.c
@@ -819,6 +819,7 @@
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 @@
#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 @@
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 @@
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