linux-kernel - [PATCH 2/5] HID: core: do not scan reports if the group is already set

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Date:	Wed,  8 Jan 2014 17:18:46 -0500
From:	Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:	Benjamin Tissoires <benjamin.tissoires@...il.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Nestor Lopez Casado <nlopezcasad@...itech.com>,
	Andrew de los Reyes <adlr@...omium.org>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/5] HID: core: do not scan reports if the group is already set

From: Benjamin Tisssoires <benjamin.tissoires@...hat.com>

This allows the transport layer (I have in mind hid-logitech-dj and uhid)
to set the group before it is added to the hid bus. This way, it can
bypass the hid_scan_report() call, and choose in advance which driver
will handle the newly created hid device.

Signed-off-by: Benjamin Tisssoires <benjamin.tissoires@...hat.com>
---
 drivers/hid/hid-core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index a5a8c6a..200118a 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -2438,7 +2438,8 @@ int hid_add_device(struct hid_device *hdev)
 	 * Scan generic devices for group information
 	 */
 	if (hid_ignore_special_drivers ||
-	    !hid_match_id(hdev, hid_have_special_driver)) {
+	    (!hdev->group &&
+	     !hid_match_id(hdev, hid_have_special_driver))) {
 		ret = hid_scan_report(hdev);
 		if (ret)
 			hid_warn(hdev, "bad device descriptor (%d)\n", ret);
-- 
1.8.4.2

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