can: c_can: add a comment about IF_RX interface's use
After reading the commit 640916db ("can: c_can: Make it SMP safe") it may sound strange to see the IF_RX interface used by the can_inval_tx_object function. A comment was added to avoid any misunderstanding. Link: https://lore.kernel.org/r/20210302215435.18286-4-dariobin@libero.itSigned-off-by: Dario Binacchi <dariobin@libero.it> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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