Commit 6cb27a04 authored by Mika Westerberg's avatar Mika Westerberg
Browse files

thunderbolt: Do not allow subtracting more NFC credits than configured 



This might happen if the boot firmware uses different amount of NFC
credits than what the router suggests, or we are dealing with pre-USB4
device.

Signed-off-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
parent 1e56c88a

drivers/thunderbolt/switch.c

+3 −0
Original line number Diff line number Diff line
@@ -623,6 +623,9 @@ int tb_port_add_nfc_credits(struct tb_port *port, int credits) 
		return 0;



	nfc_credits = port->config.nfc_credits & ADP_CS_4_NFC_BUFFERS_MASK;

	if (credits < 0)

		credits = max_t(int, -nfc_credits, credits);



	nfc_credits += credits;



	tb_port_dbg(port, "adding %d NFC credits to %lu", credits,