linux-kernel - [PATCH v2] ACPI / button: remove pointer to old lid

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Date:	Fri, 29 Jul 2016 17:08:41 +0200
From:	Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Lv Zheng <lv.zheng@...el.com>
Cc:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] 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.tissoires@...hat.com>

--
changes in v2:
- put the NULL assignments at their correct place
---
 drivers/acpi/button.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/acpi/button.c b/drivers/acpi/button.c
index 5c3b091..a3873b3 100644
--- a/drivers/acpi/button.c
+++ b/drivers/acpi/button.c
@@ -191,8 +191,10 @@ remove_dev_dir:
 	acpi_device_dir(device) = NULL;
 remove_lid_dir:
 	remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
+	acpi_lid_dir = NULL;
 remove_button_dir:
 	remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
+	acpi_button_dir = NULL;
 	goto done;
 }
 
@@ -209,7 +211,9 @@ static int acpi_button_remove_fs(struct acpi_device *device)
 			  acpi_lid_dir);
 	acpi_device_dir(device) = NULL;
 	remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
+	acpi_lid_dir = NULL;
 	remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
+	acpi_button_dir = NULL;
 
 	return 0;
 }
-- 
2.5.5