USB: usblp: fix DMA to stack

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commit 020a1f4534 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>

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Johan Hovold 2021-01-04 15:53:02 +01:00 • committed by Greg Kroah-Hartman

parent 4f7e97ffb4

commit 0a5b28c99d

1 changed files with 19 additions and 2 deletions

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drivers/usb/class/usblp.c

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