linux-kernel - [PATCH v2] drivers: input: touchscreen: sur40: remove stack variable 'packet_id' from sur40

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Message-ID: <5296C7C1.3090408@gmail.com>
Date:	Thu, 28 Nov 2013 12:34:09 +0800
From:	Chen Gang <gang.chen.5i5j@...il.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	floe@...terbrot.org, rydberg@...omail.se,
	David Herrmann <dh.herrmann@...il.com>,
	rkuo <rkuo@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-input@...r.kernel.org
Subject: [PATCH v2] drivers: input: touchscreen: sur40: remove stack variable
 'packet_id' from sur40_poll()

The drivers process all blobs in one pass, so there is no need to
preserve value of packet_id between calls to sur40_poll().

And the original implementation may cause 'packet_id' uninitialized,
the related warning (with allmodconfig under hexagon):

  drivers/input/touchscreen/sur40.c: In function 'sur40_poll':
  drivers/input/touchscreen/sur40.c:297:6: warning: 'packet_id' may be used uninitialized in this function [-Wuninitialized]


Signed-off-by: Chen Gang <gang.chen.5i5j@...il.com>
---
 drivers/input/touchscreen/sur40.c |   10 ----------
 1 files changed, 0 insertions(+), 10 deletions(-)

diff --git a/drivers/input/touchscreen/sur40.c b/drivers/input/touchscreen/sur40.c
index cfd1b7e..2ca32cb 100644
--- a/drivers/input/touchscreen/sur40.c
+++ b/drivers/input/touchscreen/sur40.c
@@ -251,7 +251,6 @@ static void sur40_poll(struct input_polled_dev *polldev)
 	struct sur40_state *sur40 = polldev->private;
 	struct input_dev *input = polldev->input;
 	int result, bulk_read, need_blobs, packet_blobs, i;
-	u32 packet_id;
 
 	struct sur40_header *header = &sur40->bulk_in_buffer->header;
 	struct sur40_blob *inblob = &sur40->bulk_in_buffer->blobs[0];
@@ -286,17 +285,8 @@ static void sur40_poll(struct input_polled_dev *polldev)
 		if (need_blobs == -1) {
 			need_blobs = le16_to_cpu(header->count);
 			dev_dbg(sur40->dev, "need %d blobs\n", need_blobs);
-			packet_id = header->packet_id;
 		}
 
-		/*
-		 * Sanity check. when video data is also being retrieved, the
-		 * packet ID will usually increase in the middle of a series
-		 * instead of at the end.
-		 */
-		if (packet_id != header->packet_id)
-			dev_warn(sur40->dev, "packet ID mismatch\n");
-
 		packet_blobs = result / sizeof(struct sur40_blob);
 		dev_dbg(sur40->dev, "received %d blobs\n", packet_blobs);
 
-- 
1.7.7.6
--
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