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This reverts commit5083fd7bdf. A bulk-out size smaller than the end-point size is indeed valid. The offending commit broke the usb-debug driver for EHCI debug devices, which use 8-byte buffers. Fixes:5083fd7bdf("USB: serial: make bulk_out_size a lower limit") Reported-by: "Li, Elvin" <[email protected]> Cc: stable <[email protected]> # v3.15 Signed-off-by: Johan Hovold <[email protected]>