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usb: cdc-acm: send zero packet for intel 7260 modem 

For Intel 7260 modem, it is needed for host side to send zero
packet if the BULK OUT size is equal to USB endpoint max packet
length. Otherwise, modem side may still wait for more data and
cannot give response to host side.

Signed-off-by: Konrad Leszczynski <konrad.leszczynski@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lu Baolu 2016-01-06 15:10:04 +08:00 committed by Greg Kroah-Hartman
parent 19454462ac
commit ffdb1e369a
2 changed files with 7 additions and 0 deletions
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6
drivers/usb/class/cdc-acm.c
View File

@ -1405,6 +1405,8 @@ static int acm_probe(struct usb_interface *intf,
usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
NULL, acm->writesize, acm_write_bulk, snd);
snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
if (quirks & SEND_ZERO_PACKET)
snd->urb->transfer_flags |= URB_ZERO_PACKET;
snd->instance = acm;
}
@ -1862,6 +1864,10 @@ static const struct usb_device_id acm_ids[] = {
{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
USB_CDC_ACM_PROTO_AT_CDMA) },
{ USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */
.driver_info = SEND_ZERO_PACKET,
},
{ }
};

1
drivers/usb/class/cdc-acm.h
View File

@ -134,3 +134,4 @@ struct acm {
#define IGNORE_DEVICE BIT(5)
#define QUIRK_CONTROL_LINE_STATE BIT(6)
#define CLEAR_HALT_CONDITIONS BIT(7)
#define SEND_ZERO_PACKET BIT(8)