diff options
Diffstat (limited to 'drivers/net/usb/cdc_mbim.c')
| -rw-r--r-- | drivers/net/usb/cdc_mbim.c | 28 |
1 files changed, 17 insertions, 11 deletions
diff --git a/drivers/net/usb/cdc_mbim.c b/drivers/net/usb/cdc_mbim.c index 6533a9f7918b..253472a8a983 100644 --- a/drivers/net/usb/cdc_mbim.c +++ b/drivers/net/usb/cdc_mbim.c @@ -429,9 +429,18 @@ static const struct driver_info cdc_mbim_info = { }; /* MBIM and NCM devices should not need a ZLP after NTBs with - * dwNtbOutMaxSize length. This driver_info is for the exceptional - * devices requiring it anyway, allowing them to be supported without - * forcing the performance penalty on all the sane devices. + * dwNtbOutMaxSize length. Nevertheless, a number of devices from + * different vendor IDs will fail unless we send ZLPs, forcing us + * to make this the default. + * + * This default may cause a performance penalty for spec conforming + * devices wanting to take advantage of optimizations possible without + * ZLPs. A whitelist is added in an attempt to avoid this for devices + * known to conform to the MBIM specification. + * + * All known devices supporting NCM compatibility mode are also + * conforming to the NCM and MBIM specifications. For this reason, the + * NCM subclass entry is also in the ZLP whitelist. */ static const struct driver_info cdc_mbim_info_zlp = { .description = "CDC MBIM", @@ -454,16 +463,13 @@ static const struct usb_device_id mbim_devs[] = { { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE), .driver_info = (unsigned long)&cdc_mbim_info, }, - /* Sierra Wireless MC7710 need ZLPs */ - { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x68a2, USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE), - .driver_info = (unsigned long)&cdc_mbim_info_zlp, - }, - /* HP hs2434 Mobile Broadband Module needs ZLPs */ - { USB_DEVICE_AND_INTERFACE_INFO(0x3f0, 0x4b1d, USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE), - .driver_info = (unsigned long)&cdc_mbim_info_zlp, + /* ZLP conformance whitelist: All Ericsson MBIM devices */ + { USB_VENDOR_AND_INTERFACE_INFO(0x0bdb, USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE), + .driver_info = (unsigned long)&cdc_mbim_info, }, + /* default entry */ { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE), - .driver_info = (unsigned long)&cdc_mbim_info, + .driver_info = (unsigned long)&cdc_mbim_info_zlp, }, { }, |