From 4ca231b2e6ed171107c5b21f9e92d1965fd6fd9e Mon Sep 17 00:00:00 2001
From: Eldad Zack <eldad@fogrefinery.com>
Date: Mon, 29 Apr 2013 21:15:46 +0200
Subject: [PATCH] ALSA: usb-audio: caiaq: fix endianness bug in
snd_usb_caiaq_maschine_dispatch
Current code does this:
be16_to_cpu(buf[i * 2] << 8 | buf[(i * 2) + 1])
Which is effectively (neglecting the index):
be16_to_cpu(be16_to_cpu(*((u16 *) buf)))
This means the int16 in the buffer is not converted at all.
Daniel Mack confirmed that the driver works on little endian
CPUs, leading to the conclusion that the device-side structure
is actually little endian.
This changes the code to use le16_to_cpu().
Caught by sparse.
Acked-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Eldad Zack <eldad@fogrefinery.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/usb/caiaq/input.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/sound/usb/caiaq/input.c b/sound/usb/caiaq/input.c
index efc70ae915c5..4b3fb91deecd 100644
--- a/sound/usb/caiaq/input.c
+++ b/sound/usb/caiaq/input.c
@@ -488,13 +488,13 @@ static void snd_usb_caiaq_maschine_dispatch(struct snd_usb_caiaqdev *cdev,
unsigned int len)
{
unsigned int i, pad_id;
- uint16_t pressure;
+ __le16 *pressure = (__le16 *) buf;
for (i = 0; i < MASCHINE_PADS; i++) {
- pressure = be16_to_cpu(buf[i * 2] << 8 | buf[(i * 2) + 1]);
- pad_id = pressure >> 12;
-
- input_report_abs(cdev->input_dev, MASCHINE_PAD(pad_id), pressure & 0xfff);
+ pad_id = le16_to_cpu(*pressure) >> 12;
+ input_report_abs(cdev->input_dev, MASCHINE_PAD(pad_id),
+ le16_to_cpu(*pressure) & 0xfff);
+ pressure++;
}
input_sync(cdev->input_dev);
--
2.30.2