USB: serial: sierra driver zero length packet fix
- Fixed a problem with transferring packets with size a multiple of Bulk Xfer size in function sierra_write(). Added transfer flag URB_ZERO_PACKET before submitting the urb to trigger Zero-length data transfer when packet size is a multiple of Bulk Xfer. Signed-off-by: Elina Pasheva <epasheva@sierrawireless.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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