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ACM gadget: fix endianness in notifications 

The gadget code exports the bitfield for serial status changes
over the wire in its internal endianness. The fix is to convert
to little endian before sending it over the wire.

Signed-off-by: Oliver Neukum <oneukum@suse.com>
Tested-by: 家瑋 <momo1208@gmail.com>
CC: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
zero-colors
Oliver Neukum 2017-03-14 12:09:56 +01:00 committed by Greg Kroah-Hartman
parent 2e47c53503
commit cdd7928df0
1 changed files with 3 additions and 1 deletions
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4
drivers/usb/gadget/function/f_acm.c
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@ -535,13 +535,15 @@ static int acm_notify_serial_state(struct f_acm *acm)
{
struct usb_composite_dev *cdev = acm->port.func.config->cdev;
int status;
__le16 serial_state;
spin_lock(&acm->lock);
if (acm->notify_req) {
dev_dbg(&cdev->gadget->dev, "acm ttyGS%d serial state %04x\n",
acm->port_num, acm->serial_state);
serial_state = cpu_to_le16(acm->serial_state);
status = acm_cdc_notify(acm, USB_CDC_NOTIFY_SERIAL_STATE,
0, &acm->serial_state, sizeof(acm->serial_state));
0, &serial_state, sizeof(acm->serial_state));
} else {
acm->pending = true;
status = 0;