Hi, On 2013년 06월 25일 22:34, Chanwoo Choi wrote: > On Tue, Jun 25, 2013 at 2:02 PM, Jonghwa Lee <jonghwa3....@samsung.com > <mailto:jonghwa3....@samsung.com>> wrote: > > This patch prevents NULL pointer error cauesed by unregistering > unregistered > exton notifier block. At the probing time of charger manager, it tries to > remove extcon notifier block when it fails to initialize them. It has to > be > applied for only registered one. Otherwise, it'd make kernel panic. To > make it > work right, it checks extcon_specific_cable_nb's extcon_dev node. If > extcon > cable notifier block was registered successfully, it has proper extcon_dev > pointer if not so it has NULL pointer. > > Signed-off-by: Jonghwa Lee <jonghwa3....@samsung.com > <mailto:jonghwa3....@samsung.com>> > Signed-off-by: Myungjoo Ham <myungjoo....@samsung.com > <mailto:myungjoo....@samsung.com>> > --- > drivers/power/charger-manager.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/drivers/power/charger-manager.c > b/drivers/power/charger-manager.c > index 7d1bcde..c55a7dc 100644 > --- a/drivers/power/charger-manager.c > +++ b/drivers/power/charger-manager.c > @@ -1666,7 +1666,9 @@ err_reg_extcon: > charger = &desc->charger_regulators[i]; > for (j = 0; j < charger->num_cables; j++) { > struct charger_cable *cable = &charger->cables[j]; > - extcon_unregister_interest(&cable->extcon_dev); > + /* Remove notifier block if only edev exists */ > + if (cable->extcon_dev.edev) > + > extcon_unregister_interest(&cable->extcon_dev); > } > > regulator_put(desc->charger_regulators[i].consumer); > -- > 1.7.9.5 > > > The charger-manager.c call extcon_unregister_interest() in > charger_manager_remove() function. > So, you should to fix it on charger_manager_remove() to remove NULL pointer > error. >
When .remove() callback function is called, there is no unregistered cable notifier block. Because all extcon notifier block would be registered at probing time, and if it is failed the probing can't be achieved. So I think it doesn't need to fix .remove() callback function as like above. Thank you for reviewing. Best regards, Jonghwa. > Acked-by: Chanwoo Choi <cw00.c...@samsung.com <mailto:cw00.c...@samsung.com>> > > Thanks, > Chanwoo Choi > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
