719b8f2850
New core functions to make sending/receiving USB control messages easier and saner. In discussions, it turns out that the large majority of users of usb_control_msg() do so in potentially incorrect ways. The most common issue is where a "short" message is received, yet never detected properly due to "incorrect" error handling. Handle all of this in the USB core with two new functions to try to make working with USB control messages simpler. No more need for dynamic data, messages can be on the stack, and only "complete" send/receive will work without causing an error. Link: https://lore.kernel.org/r/20200914153756.3412156-3-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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