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authorEldad Zack <eldad@fogrefinery.com>2013-04-29 21:15:46 +0200
committerTakashi Iwai <tiwai@suse.de>2013-04-30 09:19:02 +0200
commit4ca231b2e6ed171107c5b21f9e92d1965fd6fd9e (patch)
tree25acf07f6210c17b7a1f930e7d136d0202094dba /sound
parent167d0a11d5feedd1f9cb9ae128ac543e97148eff (diff)
downloadkernel-4ca231b2e6ed171107c5b21f9e92d1965fd6fd9e.tar.gz
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>
Diffstat (limited to 'sound')
-rw-r--r--sound/usb/caiaq/input.c10
1 files 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);