diff options
| author | Bjørn Mork <bjorn@mork.no> | 2018-05-02 22:22:54 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-05-03 11:25:03 -0400 |
| commit | 5697db4a696c41601a1d15c1922150b4dbf5726c (patch) | |
| tree | f58aa094cab9ff7f5bdffd72d4a3ff09ce6a73ce | |
| parent | 94720e3aee6884d8c8beb678001629da60ec6366 (diff) | |
| download | linux-5697db4a696c41601a1d15c1922150b4dbf5726c.tar.bz2 | |
qmi_wwan: do not steal interfaces from class drivers
The USB_DEVICE_INTERFACE_NUMBER matching macro assumes that
the { vendorid, productid, interfacenumber } set uniquely
identifies one specific function. This has proven to fail
for some configurable devices. One example is the Quectel
EM06/EP06 where the same interface number can be either
QMI or MBIM, without the device ID changing either.
Fix by requiring the vendor-specific class for interface number
based matching. Functions of other classes can and should use
class based matching instead.
Fixes: 03304bcb5ec4 ("net: qmi_wwan: use fixed interface number matching")
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/usb/qmi_wwan.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c index 51c68fc416fa..42565dd33aa6 100644 --- a/drivers/net/usb/qmi_wwan.c +++ b/drivers/net/usb/qmi_wwan.c @@ -1344,6 +1344,18 @@ static int qmi_wwan_probe(struct usb_interface *intf, id->driver_info = (unsigned long)&qmi_wwan_info; } + /* There are devices where the same interface number can be + * configured as different functions. We should only bind to + * vendor specific functions when matching on interface number + */ + if (id->match_flags & USB_DEVICE_ID_MATCH_INT_NUMBER && + desc->bInterfaceClass != USB_CLASS_VENDOR_SPEC) { + dev_dbg(&intf->dev, + "Rejecting interface number match for class %02x\n", + desc->bInterfaceClass); + return -ENODEV; + } + /* Quectel EC20 quirk where we've QMI on interface 4 instead of 0 */ if (quectel_ec20_detected(intf) && desc->bInterfaceNumber == 0) { dev_dbg(&intf->dev, "Quectel EC20 quirk, skipping interface 0\n"); |