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can: c_can: add a comment about IF_RX interface's use 

After reading the commit 640916db2b ("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.it
Signed-off-by: Dario Binacchi <dariobin@libero.it>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Dario Binacchi 2021-03-02 22:54:32 +01:00 committed by Marc Kleine-Budde
parent c8a6b44388
commit eddf671150
1 changed files with 5 additions and 0 deletions
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5
drivers/net/can/c_can/c_can.c
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@ -710,6 +710,11 @@ static void c_can_do_tx(struct net_device *dev)
idx--;
pend &= ~(1 << idx);
obj = idx + C_CAN_MSG_OBJ_TX_FIRST;
/* We use IF_RX interface instead of IF_TX because we
* are called from c_can_poll(), which runs inside
* NAPI. We are not trasmitting.
*/
c_can_inval_tx_object(dev, IF_RX, obj);
can_get_echo_skb(dev, idx, NULL);
bytes += priv->dlc[idx];