diff options
| author | Mika Westerberg <[email protected]> | 2021-11-18 09:06:45 +0200 |
|---|---|---|
| committer | Mika Westerberg <[email protected]> | 2021-12-07 15:18:33 +0300 |
| commit | 6cb27a04fb779717c4a3d20233b93596885838cf (patch) | |
| tree | e8394e37239e678d31d726aebd2860d39019f2ac | |
| parent | 1e56c88adecc2dfe14973fa47898861a839e62d4 (diff) | |
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: Mika Westerberg <[email protected]>
| -rw-r--r-- | drivers/thunderbolt/switch.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c index 3014146081c1..463cfdc0b42f 100644 --- a/drivers/thunderbolt/switch.c +++ b/drivers/thunderbolt/switch.c @@ -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, |