From nobody Mon Feb 9 15:32:24 2026 Received: from codeconstruct.com.au (pi.codeconstruct.com.au [203.29.241.158]) (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 B5729277028 for ; Fri, 11 Apr 2025 01:09:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=203.29.241.158 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744333756; cv=none; b=n1M3BGDquxrmHgjUQR8dx4PJF0EivTA6oq5P5t2dYij0Ur6dSrCn/GQb66zV2Uc6QFEbEh8FV9MU0L7GZAQ+RQrgCDEKVv+lBpM+5nZb9b/OWtBvTcTvy8gD6mYK3sUXJvvH8/REdabHLHtnbyGNMuOUtEmo8PLaWXw1lOlueiA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744333756; c=relaxed/simple; bh=gqOrP4wS+3zulmap6u+NFQIuSHAi9/1PflL5jKTKhQo=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Q9HMC5F/MqPZsGF70fAQMBdsQjM32RqadmzasH4RHL7adYXL6IVSZVRL4z5w+tHa8yWFh2oe9gUj1AkxyZnnSxP3fPRazmIQmWvrFqTAiC3yMrFo653z0gkaKE8WfVckgctRgjm3GctlIbNPYriDWU2Zns2wYGLXvWnE0bGcMaE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=codeconstruct.com.au; spf=pass smtp.mailfrom=codeconstruct.com.au; dkim=pass (2048-bit key) header.d=codeconstruct.com.au header.i=@codeconstruct.com.au header.b=dKMosy8m; arc=none smtp.client-ip=203.29.241.158 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=codeconstruct.com.au Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=codeconstruct.com.au Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=codeconstruct.com.au header.i=@codeconstruct.com.au header.b="dKMosy8m" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=codeconstruct.com.au; s=2022a; t=1744333751; bh=KFtQnngCykasdCrNVPG+SOfUzKEa2z4spwHYuIB44t0=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=dKMosy8m20GXWuALQvsB5mTGk5kl0tE3piF8e7cwOm5XQ8KseCkLjXYYUmwKiqbE6 1qa17aCynswRn9iV8qacBrl5Z5l88Qxjep/zHkFS1TojBwrEMC+DAD6v8sd1fOdXSQ RxGlKd0VIrrxUWtHhGHAFe22mlF5sFG+d93/t1+pF6b9/yTNL5KMHQd8ArbbaL4NO6 fp9T9z6tePrn5RSDye+wU44jh9HhwnevrBBUl7mM5HM90/0uuMpqyFNlk2j+7ZqHDc fgj2HJSo7KuuhoP+y7vD6zpzP62u116jrACB1q6D29o2robOLCK1ZLsquhetr4gC8h nwyISRwGGEOhQ== Received: from [127.0.1.1] (unknown [180.150.112.225]) by mail.codeconstruct.com.au (Postfix) with ESMTPSA id 562D97D716; Fri, 11 Apr 2025 09:09:11 +0800 (AWST) From: Andrew Jeffery Date: Fri, 11 Apr 2025 10:38:36 +0930 Subject: [PATCH 6/7] soc: aspeed: lpc-snoop: Rearrange channel paths Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250411-aspeed-lpc-snoop-fixes-v1-6-64f522e3ad6f@codeconstruct.com.au> References: <20250411-aspeed-lpc-snoop-fixes-v1-0-64f522e3ad6f@codeconstruct.com.au> In-Reply-To: <20250411-aspeed-lpc-snoop-fixes-v1-0-64f522e3ad6f@codeconstruct.com.au> To: linux-aspeed@lists.ozlabs.org Cc: Joel Stanley , Henry Martin , Jean Delvare , Patrick Rudolph , Andrew Geissler , Ninad Palsule , Patrick Venture , Robert Lippert , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Andrew Jeffery X-Mailer: b4 0.14.2 Order assignments such that tests for conditions not involving resource acquisition are ordered before those testing acquired resources, and order managed resource acquisition before unmanaged where possible. This way we minimise the amount of manual cleanup required. In the process, improve readability of the code by introducing a channel pointer that takes the place of the repeated object lookups. Signed-off-by: Andrew Jeffery Acked-by: Jean Delvare --- drivers/soc/aspeed/aspeed-lpc-snoop.c | 47 ++++++++++++++++++++-----------= ---- 1 file changed, 27 insertions(+), 20 deletions(-) diff --git a/drivers/soc/aspeed/aspeed-lpc-snoop.c b/drivers/soc/aspeed/asp= eed-lpc-snoop.c index f6952f71eda52c95aea5ad1084edd218b88f1234..0b2044fd79b1be08dfa33bfcaf2= 49b020c909bb9 100644 --- a/drivers/soc/aspeed/aspeed-lpc-snoop.c +++ b/drivers/soc/aspeed/aspeed-lpc-snoop.c @@ -189,31 +189,33 @@ static int aspeed_lpc_enable_snoop(struct aspeed_lpc_= snoop *lpc_snoop, { const struct aspeed_lpc_snoop_model_data *model_data; u32 hicr5_en, snpwadr_mask, snpwadr_shift, hicrb_en; + struct aspeed_lpc_snoop_channel *channel; int rc =3D 0; =20 if (index < 0 || index >=3D ARRAY_SIZE(lpc_snoop->chan)) return -EINVAL; =20 - if (lpc_snoop->chan[index].enabled) + channel =3D &lpc_snoop->chan[index]; + + if (channel->enabled) return -EBUSY; =20 - init_waitqueue_head(&lpc_snoop->chan[index].wq); - /* Create FIFO datastructure */ - rc =3D kfifo_alloc(&lpc_snoop->chan[index].fifo, - SNOOP_FIFO_SIZE, GFP_KERNEL); + init_waitqueue_head(&channel->wq); + + channel->miscdev.minor =3D MISC_DYNAMIC_MINOR; + channel->miscdev.fops =3D &snoop_fops; + channel->miscdev.parent =3D dev; + + channel->miscdev.name =3D + devm_kasprintf(dev, GFP_KERNEL, "%s%d", DEVICE_NAME, index); + if (!channel->miscdev.name) + return -ENOMEM; + + rc =3D kfifo_alloc(&channel->fifo, SNOOP_FIFO_SIZE, GFP_KERNEL); if (rc) return rc; =20 - lpc_snoop->chan[index].miscdev.minor =3D MISC_DYNAMIC_MINOR; - lpc_snoop->chan[index].miscdev.name =3D - devm_kasprintf(dev, GFP_KERNEL, "%s%d", DEVICE_NAME, index); - if (!lpc_snoop->chan[index].miscdev.name) { - rc =3D -ENOMEM; - goto err_free_fifo; - } - lpc_snoop->chan[index].miscdev.fops =3D &snoop_fops; - lpc_snoop->chan[index].miscdev.parent =3D dev; - rc =3D misc_register(&lpc_snoop->chan[index].miscdev); + rc =3D misc_register(&channel->miscdev); if (rc) goto err_free_fifo; =20 @@ -236,6 +238,7 @@ static int aspeed_lpc_enable_snoop(struct aspeed_lpc_sn= oop *lpc_snoop, goto err_misc_deregister; } =20 + /* Enable LPC snoop channel at requested port */ regmap_update_bits(lpc_snoop->regmap, HICR5, hicr5_en, hicr5_en); regmap_update_bits(lpc_snoop->regmap, SNPWADR, snpwadr_mask, lpc_port << snpwadr_shift); @@ -244,7 +247,7 @@ static int aspeed_lpc_enable_snoop(struct aspeed_lpc_sn= oop *lpc_snoop, if (model_data && model_data->has_hicrb_ensnp) regmap_update_bits(lpc_snoop->regmap, HICRB, hicrb_en, hicrb_en); =20 - lpc_snoop->chan[index].enabled =3D true; + channel->enabled =3D true; =20 return 0; =20 @@ -259,10 +262,14 @@ __attribute__((nonnull)) static void aspeed_lpc_disable_snoop(struct aspeed_lpc_snoop *lpc_snoop, int index) { + struct aspeed_lpc_snoop_channel *channel; + if (index < 0 || index >=3D ARRAY_SIZE(lpc_snoop->chan)) return; =20 - if (!lpc_snoop->chan[index].enabled) + channel =3D &lpc_snoop->chan[index]; + + if (!channel->enabled) return; =20 /* Disable interrupts along with the device */ @@ -281,10 +288,10 @@ static void aspeed_lpc_disable_snoop(struct aspeed_lp= c_snoop *lpc_snoop, return; } =20 - lpc_snoop->chan[index].enabled =3D false; + channel->enabled =3D false; /* Consider improving safety wrt concurrent reader(s) */ - misc_deregister(&lpc_snoop->chan[index].miscdev); - kfifo_free(&lpc_snoop->chan[index].fifo); + misc_deregister(&channel->miscdev); + kfifo_free(&channel->fifo); } =20 static int aspeed_lpc_snoop_probe(struct platform_device *pdev) --=20 2.39.5