qmi_wwan: do not steal interfaces from class drivers

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[ Upstream commit 5697db4a69 ]

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: 03304bcb5e ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Bjørn Mork 2018-05-02 22:22:54 +02:00 • committed by Greg Kroah-Hartman

parent c1ce5f3590

commit 2bb66a711c

1 changed files with 12 additions and 0 deletions

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drivers/net/usb/qmi_wwan.c

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