linux-kernel - [PATCH] Fix hiddev's use of usb_find

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Date:	Sun, 12 Sep 2010 21:32:35 +0200
From:	Guillaume Chazarain <guichaz@...il.com>
To:	Arnd Bergmann <arnd@...db.de>, Jiri Kosina <jkosina@...e.cz>,
	"Greg Kroah-Hartman" <gregkh@...e.de>, linux-kernel@...r.kernel.org
Cc:	Guillaume Chazarain <guichaz@...il.com>
Subject: [PATCH] Fix hiddev's use of usb_find_interface

My macbook infrared remote control was broken by commit
bd25f4dd6972755579d0ea50d1a5ace2e9b00d1a:
HID: hiddev: use usb_find_interface, get rid of BKL

This device appears in dmesg as:
apple 0003:05AC:8242.0001: hiddev0,hidraw0: USB HID v1.11 Device
[Apple Computer, Inc. IR Receiver] on usb-0000:00:1d.2-1/input0

It stopped working as lircd was getting ENODEV when opening /dev/usb/hiddev0.

AFAICS hiddev_driver is a dummy driver so usb_find_interface(&hiddev_driver)
does not find anything.

The device is associated with the usbhid driver, so let's do
usb_find_interface(&hid_driver) instead.

$ ls -l /sys/devices/pci0000:00/0000:00:1d.2/usb7/7-1/7-1:1.0/usb/hiddev0/device/driver
lrwxrwxrwx 1 root root 0 2010-09-12 16:28 /sys/devices/pci0000:00/0000:00:1d.2/usb7/7-1/7-1:1.0/usb/hiddev0/device/driver -> ../../../../../../bus/usb/drivers/usbhid

Signed-off-by: Guillaume Chazarain <guichaz@...il.com>
---
 drivers/hid/usbhid/hid-core.c |    5 +++++
 drivers/hid/usbhid/hiddev.c   |    2 +-
 drivers/hid/usbhid/usbhid.h   |    1 +
 3 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index b729c02..7b2f7f6 100644
--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -1445,6 +1445,11 @@ static const struct hid_device_id hid_usb_table[] = {
 	{ }
 };
 
+struct usb_interface *usbhid_find_interface(int minor)
+{
+	return usb_find_interface(&hid_driver, minor);
+}
+
 static struct hid_driver hid_usb_driver = {
 	.name = "generic-usb",
 	.id_table = hid_usb_table,
diff --git a/drivers/hid/usbhid/hiddev.c b/drivers/hid/usbhid/hiddev.c
index 0a29c51..681e620 100644
--- a/drivers/hid/usbhid/hiddev.c
+++ b/drivers/hid/usbhid/hiddev.c
@@ -270,7 +270,7 @@ static int hiddev_open(struct inode *inode, struct file *file)
 	struct hiddev *hiddev;
 	int res;
 
-	intf = usb_find_interface(&hiddev_driver, iminor(inode));
+	intf = usbhid_find_interface(iminor(inode));
 	if (!intf)
 		return -ENODEV;
 	hid = usb_get_intfdata(intf);
diff --git a/drivers/hid/usbhid/usbhid.h b/drivers/hid/usbhid/usbhid.h
index 693fd3e..89d2e84 100644
--- a/drivers/hid/usbhid/usbhid.h
+++ b/drivers/hid/usbhid/usbhid.h
@@ -42,6 +42,7 @@ void usbhid_submit_report
 (struct hid_device *hid, struct hid_report *report, unsigned char dir);
 int usbhid_get_power(struct hid_device *hid);
 void usbhid_put_power(struct hid_device *hid);
+struct usb_interface *usbhid_find_interface(int minor);
 
 /* iofl flags */
 #define HID_CTRL_RUNNING	1
-- 
1.7.0.4

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