wifi: mt76: mt7921: fix potential tx_retries underflow

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When FIELD_GET returns 0 for the retry count, subtracting 1 causes
an unsigned integer underflow, resulting in tx_retries becoming a
very large value (0xFFFFFFFF for u32).

Fix by checking if count is non-zero before subtracting 1.

Fixes: 9aecfa754c ("wifi: mt76: mt7921e: report tx retries/failed counts in tx free event")
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Link: https://patch.msgid.link/20260605113306.3485554-2-ryder.lee@mediatek.com
Signed-off-by: Felix Fietkau <nbd@nbd.name>

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Ryder Lee 2026-06-05 04:33:04 -07:00 • committed by Felix Fietkau

parent 05e72b6167

commit 3c5671ed81

1 changed files with 3 additions and 2 deletions

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drivers/net/wireless/mediatek/mt76/mt7921/mac.c

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