linux-kernel - [PATCH 02/19] Input: Improve the events-per-packet estimate

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Date:	Sun, 12 Aug 2012 23:42:20 +0200
From:	"Henrik Rydberg" <rydberg@...omail.se>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Jiri Kosina <jkosina@...e.cz>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Henrik Rydberg <rydberg@...omail.se>
Subject: [PATCH 02/19] Input: Improve the events-per-packet estimate

Many MT devices send a number of keys along with the mt information.
This patch makes sure that there is room for them in the packet
buffer.

Signed-off-by: Henrik Rydberg <rydberg@...omail.se>
---
 drivers/input/input.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/input/input.c b/drivers/input/input.c
index 6e90705..8ebf116 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -1777,6 +1777,9 @@ static unsigned int input_estimate_events_per_packet(struct input_dev *dev)
 		if (test_bit(i, dev->relbit))
 			events++;
 
+	/* Make room for KEY and MSC events */
+	events += 7;
+
 	return events;
 }
 
@@ -1815,6 +1818,7 @@ int input_register_device(struct input_dev *dev)
 {
 	static atomic_t input_no = ATOMIC_INIT(0);
 	struct input_handler *handler;
+	unsigned int packet_size;
 	const char *path;
 	int error;
 
@@ -1827,9 +1831,9 @@ int input_register_device(struct input_dev *dev)
 	/* Make sure that bitmasks not mentioned in dev->evbit are clean. */
 	input_cleanse_bitmasks(dev);
 
-	if (!dev->hint_events_per_packet)
-		dev->hint_events_per_packet =
-				input_estimate_events_per_packet(dev);
+	packet_size = input_estimate_events_per_packet(dev);
+	if (dev->hint_events_per_packet < packet_size)
+		dev->hint_events_per_packet = packet_size;
 
 	/*
 	 * If delay and period are pre-set by the driver, then autorepeating
-- 
1.7.11.4

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