From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 05D481D1E69; Wed, 2 Oct 2024 14:44:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727880264; cv=none; b=Z4weLLomjJTxIbijzYKr64z0WCkIHKBNoAZRDGduCspQj7alHIJFQHE36xJbmjX21pO3bTMLdj68h1SI14Aw6TQoMAAT9XWXqFVT4vKPOYeu+02SAs9KdYcJEP7aBEXCB47cmEn1PYHQR+6ouJ9wJJsjucqXcJLy2Ln/M+8G+KQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727880264; c=relaxed/simple; bh=Lt1r2ZEewgPqEM1GJ+watjsDoDeq9tRa1ND25rcZaho=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=jMTuANUVSgJZ4cMbrDw0rlnUtf5GXNS2HzBBlJ/gTXbXM/aXYwcU7vP+oqFQQWKvkBsJBpQP6+oOmqEgBEczo2SYugnq7Ozn0+CTuU8Q6dFQPdWfM1LAKhpRN0MotsWMw63vkw4/uH6d8DIps11TqkYWtUL/nuVL1mUAHZXPxKk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=bcvFD5/T; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="bcvFD5/T" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7C0D0C4CEC2; Wed, 2 Oct 2024 14:44:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1727880263; bh=Lt1r2ZEewgPqEM1GJ+watjsDoDeq9tRa1ND25rcZaho=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bcvFD5/TNE3QoVSxrl6Q9PrLZaaHEzxAuK1pLFaoqnBwkQrWy3FlXtztLGEZ+B3BZ hctdSrR3cRhtBTeCReTqyEGBzIG/8Ab3c1iPH4cuR/9Q9vcqPLj02YgKFS4FZe0acO 998qG4YAVpi52ATYpqBAhtC+0QH8ft25rh1QTqQ0= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Sean Anderson , Shannon Nelson , Eric Dumazet , Paolo Abeni , Sasha Levin Subject: [PATCH 6.6 369/538] net: xilinx: axienet: Schedule NAPI in two steps Date: Wed, 2 Oct 2024 15:00:08 +0200 Message-ID: <20241002125806.994204375@linuxfoundation.org> X-Mailer: git-send-email 2.46.2 In-Reply-To: <20241002125751.964700919@linuxfoundation.org> References: <20241002125751.964700919@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sean Anderson [ Upstream commit ba0da2dc934ec5ac32bbeecbd0670da16ba03565 ] As advised by Documentation/networking/napi.rst, masking IRQs after calling napi_schedule can be racy. Avoid this by only masking/scheduling if napi_schedule_prep returns true. Fixes: 9e2bc267e780 ("net: axienet: Use NAPI for TX completion path") Fixes: cc37610caaf8 ("net: axienet: implement NAPI and GRO receive") Signed-off-by: Sean Anderson Reviewed-by: Shannon Nelson Reviewed-by: Eric Dumazet Link: https://patch.msgid.link/20240913145711.2284295-1-sean.anderson@linux.dev Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- drivers/net/ethernet/xilinx/xilinx_axienet_main.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c index 65d7aaad43fe9..f869d61e3b867 100644 --- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c +++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c @@ -1042,9 +1042,10 @@ static irqreturn_t axienet_tx_irq(int irq, void *_ndev) u32 cr = lp->tx_dma_cr; cr &= ~(XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK); - axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, cr); - - napi_schedule(&lp->napi_tx); + if (napi_schedule_prep(&lp->napi_tx)) { + axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, cr); + __napi_schedule(&lp->napi_tx); + } } return IRQ_HANDLED; @@ -1086,9 +1087,10 @@ static irqreturn_t axienet_rx_irq(int irq, void *_ndev) u32 cr = lp->rx_dma_cr; cr &= ~(XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK); - axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, cr); - - napi_schedule(&lp->napi_rx); + if (napi_schedule_prep(&lp->napi_rx)) { + axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, cr); + __napi_schedule(&lp->napi_rx); + } } return IRQ_HANDLED; -- 2.43.0