From: Helge Deller <deller@xxxxxx>
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@xxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Cc: Frans Pop <elendil@xxxxxxxxx>
Cc: Kyle McMartin <kyle@xxxxxxxxxxx>
Cc: Grant Grundler <grundler@xxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/input/serio/hp_sdc.c | 24 +++++++++++++++++++++++-
1 file changed, 23 insertions(+), 1 deletion(-)
diff -puN drivers/input/serio/hp_sdc.c~drivers-input-serio-hp_sdcc-fix-crash-when-removing-hp_sdc-module drivers/input/serio/hp_sdc.c
--- a/drivers/input/serio/hp_sdc.c~drivers-input-serio-hp_sdcc-fix-crash-when-removing-hp_sdc-module
+++ a/drivers/input/serio/hp_sdc.c
@@ -819,6 +819,7 @@ static const struct parisc_device_id hp_
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(struc
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
_
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