The patch titled
rtc_cmos oops fix
has been removed from the -mm tree. Its filename was
rtc_cmos-oops-fix.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: rtc_cmos oops fix
From: David Brownell <david-b@xxxxxxxxxxx>
Fix an oops on the rtc_device_unregister() path by waiting until the last
moment before nulling the rtc->ops vector. Fix some potential oopses by
having the rtc_class_open()/rtc_class_close() interface increase the RTC's
reference count while an RTC handle is available outside the RTC framework.
Signed-off-by: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
Cc: Alessandro Zummo <a.zummo@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/rtc/class.c | 14 ++++++++++----
drivers/rtc/interface.c | 3 ++-
2 files changed, 12 insertions(+), 5 deletions(-)
diff -puN drivers/rtc/class.c~rtc_cmos-oops-fix drivers/rtc/class.c
--- a/drivers/rtc/class.c~rtc_cmos-oops-fix
+++ a/drivers/rtc/class.c
@@ -113,10 +113,16 @@ EXPORT_SYMBOL_GPL(rtc_device_register);
*/
void rtc_device_unregister(struct rtc_device *rtc)
{
- mutex_lock(&rtc->ops_lock);
- rtc->ops = NULL;
- mutex_unlock(&rtc->ops_lock);
- class_device_unregister(&rtc->class_dev);
+ if (class_device_get(&rtc->class_dev) != NULL) {
+ mutex_lock(&rtc->ops_lock);
+ /* remove innards of this RTC, then disable it, before
+ * letting any rtc_class_open() users access it again
+ */
+ class_device_unregister(&rtc->class_dev);
+ rtc->ops = NULL;
+ mutex_unlock(&rtc->ops_lock);
+ class_device_put(&rtc->class_dev);
+ }
}
EXPORT_SYMBOL_GPL(rtc_device_unregister);
diff -puN drivers/rtc/interface.c~rtc_cmos-oops-fix drivers/rtc/interface.c
--- a/drivers/rtc/interface.c~rtc_cmos-oops-fix
+++ a/drivers/rtc/interface.c
@@ -179,7 +179,7 @@ struct class_device *rtc_class_open(char
down(&rtc_class->sem);
list_for_each_entry(class_dev_tmp, &rtc_class->children, node) {
if (strncmp(class_dev_tmp->class_id, name, BUS_ID_SIZE) == 0) {
- class_dev = class_dev_tmp;
+ class_dev = class_device_get(class_dev_tmp);
break;
}
}
@@ -197,6 +197,7 @@ EXPORT_SYMBOL_GPL(rtc_class_open);
void rtc_class_close(struct class_device *class_dev)
{
module_put(to_rtc_device(class_dev)->owner);
+ class_device_put(class_dev);
}
EXPORT_SYMBOL_GPL(rtc_class_close);
_
Patches currently in -mm which might be from david-b@xxxxxxxxxxx are
origin.patch
parport-is-an-orphan.patch
add-config_generic_gpio.patch
gpio_keys-driver-shouldnt-be-arm-specific.patch
git-avr32.patch
git-md-accel.patch
8250-make-probing-for-txen-bug-a-config-option.patch
blackfin-on-chip-rtc-controller-driver.patch
documentation-ask-driver-writers-to-provide-pm-support.patch
init-dma-masks-in-pnp_dev.patch
rtc-remove-sys-class-rtc-dev.patch
rtc-rtc-interfaces-dont-use-class_device.patch
rtc-simplified-rtc-sysfs-attribute-handling.patch
rtc-simplified-proc-driver-rtc-handling.patch
rtc-remove-rest-of-class_device.patch
rtc-suspend-resume-restores-system-clock.patch
rtc-simplified-rtc-sysfs-attribute-handling-tidy.patch
-
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