USB: usblp: fix DMA to stack
commit 020a1f45 upstream. Stack-allocated buffers cannot be used for DMA (on all architectures). Replace the HP-channel macro with a helper function that allocates a dedicated transfer buffer so that it can continue to be used with arguments from the stack. Note that the buffer is cleared on allocation as usblp_ctrl_msg() returns success also on short transfers (the buffer is only used for debugging). Cc: stable@vger.kernel.org Signed-off-by:Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20210104145302.2087-1-johan@kernel.org Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
parent
7a7a734d
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