On Jul 29 2016 or thereabouts, Zheng, Lv wrote: > Hi, Benjamin > > > From: linux-acpi-ow...@vger.kernel.org [mailto:linux-acpi- > > ow...@vger.kernel.org] On Behalf Of Benjamin Tissoires > > Subject: [PATCH] ACPI / button: remove pointer to old lid_sysfs on unbind > > > > When we removed the procfs dir on error or if the driver is > > unbound, the two variables acpi_lid_dir and acpi_button_dir > > were not reset. On the next rebind, those static variables > > were not null and we couldn't re-register the device again. > > > > Signed-off-by: Benjamin Tissoires <benjamin.tissoi...@redhat.com> > > --- > > drivers/acpi/button.c | 4 ++++ > > 1 file changed, 4 insertions(+) > > > > diff --git a/drivers/acpi/button.c b/drivers/acpi/button.c > > index 5c3b091..e413599 100644 > > --- a/drivers/acpi/button.c > > +++ b/drivers/acpi/button.c > > @@ -188,9 +188,11 @@ done: > [Lv Zheng] > I have a concern here for acpi_button_add_fs(). > It looks like that this function doesn't support 2 lid devices. > So why do we need /proc/acpi/button/lid/LID0 folder?
History I guess? - (re)introduced in b34a803 "[ACPI] restore /proc/acpi/button/ (ala 2.6.12)" (2005-08-03) - procfs cleaned up in 912b742 "ACPI button: remove unused procfs I/F" (2011-03-23) And I would believe given that it was introduced prior 2.6.12, it's now kernel ABI. > > > remove_dev_dir: > > remove_proc_entry(acpi_device_bid(device), > > acpi_lid_dir); > > + acpi_lid_dir = NULL; > > acpi_device_dir(device) = NULL; > > remove_lid_dir: > > remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, > > acpi_button_dir); > [Lv Zheng] > Should acpi_lid_dir = NULL be put here? Right > > > + acpi_button_dir = NULL; > > remove_button_dir: > > remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir); > [Lv Zheng] > Should acpi_button_dir = NULL be put here? > Right > > goto done; > > @@ -207,8 +209,10 @@ static int acpi_button_remove_fs(struct > > acpi_device *device) > > acpi_device_dir(device)); > > remove_proc_entry(acpi_device_bid(device), > > acpi_lid_dir); > > + acpi_lid_dir = NULL; > > acpi_device_dir(device) = NULL; > > remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, > > acpi_button_dir); > [Lv Zheng] > Should acpi_lid_dir = NULL be put here? > > > + acpi_button_dir = NULL; > > remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir); > [Lv Zheng] > Should acpi_button_dir = NULL be put here? Right for these too to, but it won't change the result in the end :) I'll send a v2 ASAP. Cheers, Benjamin > > Thanks and best regards > Lv > > > > > return 0; > > -- > > 2.5.5 > > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-acpi" in > > the body of a message to majord...@vger.kernel.org > > More majordomo info at http://vger.kernel.org/majordomo-info.html
