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thunderbolt: Do not allow subtracting more NFC credits than configured

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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: Mika Westerberg <mika.westerberg@linux.intel.com>
This commit is contained in:
Mika Westerberg 2021-11-18 09:06:45 +02:00
parent 1e56c88ade
commit 6cb27a04fb
1 changed files with 3 additions and 0 deletions
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3
drivers/thunderbolt/switch.c
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@ -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,