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Fri, 19 Jun 2026 00:55:46 -0700 (PDT) Received: from [127.0.1.1] ([47.253.114.73]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2c720a1968bsm14892245ad.72.2026.06.19.00.55.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 19 Jun 2026 00:55:46 -0700 (PDT) From: Wayen Yan To: netdev@vger.kernel.org Cc: lorenzo@kernel.org, horms@kernel.org, pabeni@redhat.com, kuba@kernel.org, edumazet@google.com, andrew+netdev@lunn.ch, angelogioacchino.delregno@collabora.com, matthias.bgg@gmail.com, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org Subject: [PATCH net v2] net: airoha: Fix TX scheduler queue mask loop upper bound Date: Fri, 19 Jun 2026 15:52:03 +0800 Message-ID: <178185574223.2378148.13454900445528174929@gmail.com> Content-Type: text/plain; charset=utf-8 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260619_005547_670407_95121227 X-CRM114-Status: GOOD ( 12.81 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org In airoha_qdma_set_chan_tx_sched(), the loop clearing queue mask was using AIROHA_NUM_TX_RING (32) instead of AIROHA_NUM_QOS_QUEUES (8). Each channel has 8 queues, and TXQ_DISABLE_CHAN_QUEUE_MASK(channel, i) computes BIT(i + (channel * 8)). With i ranging 0..31, this causes: - channel 0: clears bit 0..31 (all 4 channels) instead of 0..7 - channel 1: clears bit 8..31 (channels 1-3) instead of 8..15 - channel 2: clears bit 16..31 (channels 2-3) instead of 16..23 - channel 3: clears bit 24..31 (channel 3 only) - correct by accident While BIT(32+) on arm64 produces 64-bit values truncated to 0 in u32 mask parameter, the loop still incorrectly clears queues within the same channel beyond queue 7. Even though this is functionally harmless (the register resets to 0 and is only ever cleared, never set — so clearing extra bits is a no-op), the loop bound is semantically wrong and should be fixed for correctness and clarity. Fix by using AIROHA_NUM_QOS_QUEUES (8) as the loop upper bound. Fixes: ef1ca9271313 ("net: airoha: Add sched HTB offload support") Acked-by: Lorenzo Bianconi Signed-off-by: Wayen Yan --- Changes in v2: - Add Lorenzo's Acked-by tag. - Clarify in commit message that this is semantically wrong but functionally harmless (register resets to 0, only cleared), as Lorenzo pointed out in review. - Rebase on current net tree. Link: https://lore.kernel.org/netdev/ajJIWMs4dVbfkHZ5@lore-desk/ Link: https://lore.kernel.org/netdev/CAL_ptrs6J3Ryw_4mVTq5VgzkB4RreF5S0huHyLvd9YwWr1m6jAA@mail.gmail.com/ drivers/net/ethernet/airoha/airoha_eth.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/airoha/airoha_eth.c b/drivers/net/ethernet/airoha/airoha_eth.c index d0c0c0ec8a..ca77747b44 100644 --- a/drivers/net/ethernet/airoha/airoha_eth.c +++ b/drivers/net/ethernet/airoha/airoha_eth.c @@ -2212,7 +2212,7 @@ static int airoha_qdma_set_chan_tx_sched(struct net_device *dev, struct airoha_gdm_port *port = netdev_priv(dev); int i; - for (i = 0; i < AIROHA_NUM_TX_RING; i++) + for (i = 0; i < AIROHA_NUM_QOS_QUEUES; i++) airoha_qdma_clear(port->qdma, REG_QUEUE_CLOSE_CFG(channel), TXQ_DISABLE_CHAN_QUEUE_MASK(channel, i)); -- 2.51.0