USB: serial: option: reimplement interface masking

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Reimplement interface masking using device flags stored directly in the
device-id table. This will make it easier to add and maintain device-id
entries by using a more compact and readable notation compared to the
current implementation (which manages pairs of masks in separate
blacklist structs).

Two convenience macros are used to flag an interface as either reserved
or as not supporting modem-control requests:

	{ USB_DEVICE(TELIT_VENDOR_ID, TELIT_PRODUCT_ME910_DUAL_MODEM),
	  .driver_info = NCTRL(0) | RSVD(3) },

For now, we limit the highest maskable interface number to seven, which
allows for (up to 16) additional device flags to be added later should
need arise.

Note that this will likely need to be backported to stable in order to
make future device-id backports more manageable.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>

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This commit is contained in:

Johan Hovold 2018-03-07 17:40:48 +01:00

parent 4a3928c6f8

commit c3a65808f0

1 changed files with 152 additions and 294 deletions

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drivers/usb/serial/option.c

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