From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1792571065; b=bFtxrRBLh+QmV008dJmJaBYtCdM3BRx+Pfz9dkfuD8D6CZmD5aU9+8O0fyyfEAuDu6dZ trgxzqYZ6ETm1fvsJLnXKUl4A3Vf8OjxWZktBTbkI2UiIzGIbXCIAILzBIszk6YBZuEet yI3cOa/Ht1bvlTjEn80zw4BDgPrvURRtMf2385gdPJNqJ9lSk/mctwdpUwhnzObCHhSw+ EH7m79g86h9veba5vZEoRPo/x/FL9pSZCPkWLsVKo2aBN/DZbnTDj+2BGDnmv+wo5V78+ hQ7/PiGER6jnalr/bq3CMWIunPDDuOXsv+W+EwOHVDQsUijTQWZThUAqeyDyhERv6eg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792571065; h=Received:DKIM-Signature:Message-ID:From:Subject:Reply-To:To: In-Reply-To:References:Content-Type:Content-Transfer-Encoding:Date; bh=o+587Yi6rOQvVsQfNzIonVmDY+myE3lKJJHYGCxOym8=; b=RtTLBN4SE3u7ogW61w6x5C3YrGa9a5ughb5xns+FuSXGX2qYDNCDAndSq+j4rzODf9yA 0o/dXuMatG1zQ86eYl0RZWq66SVbnpKtRZma0PjvOZgUtRa0wt5Q86YiU/KgLKE7p/wHy 2Eo42SJieT6Rc5qJazpFMbP2tz37b1UMLQTcuH/8Ar0XOb8p84Jdjr2XdYQB0DcZzhvua nqJ0WUDJHN33EP+hK2fiEaWJBNjE3kUK8Gp/fFH3ax38wa3euIQzDO+wYR8toQLKBuzuz I6eTRRl9QnNMT9cvyiyFUUkrK8qkR2VpPxCOB+S1M49ch9AG5LwRREYfXDeehiJOIDg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=n6bCvT07; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DFD5C606A321 for ; Wed, 21 Oct 2026 08:24:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=n6bCvT07 Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4BFAE1F000C9; Wed, 21 Oct 2026 08:24:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792571064; bh=o+587Yi6rOQvVsQfNzIonVmDY+myE3lKJJHYGCxOym8=; h=From:Subject:Reply-To:To:In-Reply-To:References:Date; b=n6bCvT07cjIKqlKS7sVZkUeD3R9jma/YnlXIAESvsUTn6MCKc+b4OyTW994fMP+c1 ClHvy0IFkylFT5uod/YMcM1MsIEbXr2cjcp/qUI6qSzn2Z+yoapn/uFm5QZM6eGHXJ vVwRtecf6oZWepTIT3zirhG/2Kb6dQBwS6EPzHudtyJiSWPQNU5ut9JCIPB+grEG1C Grd86kHdGTtY3nsnKmBPAnBzWQ/RZc0W44H469C+bLRX4+xs3/AU2jBFsN3opY5UzN vxUIlYG3byEUZr7pWjKEzwv3MiupSzUzAMS2YQzgFPvjWWcjbzbLmvNMzoSnLCisjb hzwqje1/KuYjA== Message-ID: From: sashiko-bot@kernel.org Subject: Re: [PATCH 1/2] [v4] serial: 8250: remove obsolete PORT_RSA support Reply-To: sashiko-reviews@lists.linux.dev To: "Arnd Bergmann" , linux-serial@vger.kernel.org In-Reply-To: <20261021081746.3278002-1-arnd@kernel.org> References: <20261021081746.3278002-1-arnd@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Wed, 21 Oct 2026 08:24:23 +0000 X-Mailing-List: linux-serial@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list > From: Arnd Bergmann >=20 > For all I can tell, the RSA support in the 8250 driver is not functional > and has not been for a long time. >=20 > The RSA-DV II/S ISA card[1] was sold by IODATA in the 1990s as a faster > alternative to regular ISA serial ports, and it was discontinued in > 2002. Linux support was added by Kiyokazu SUTO in 2000[2]. The company > also made PCI versions of this device, but Linux never supported those. >=20 > It seems that a patch to setserial would be required in order to set > PORT_RSA when not using autoconfiguration, and this was never merged. > Autotoconfiguration in turn requires passing probe_rsa=3DIOPORT arguments > at boot or module load time, which is not how any other uart drivers > work any more since linux-2.4. >=20 > This patch removes all code related to the RSA support, with the exception > of the user-visible PORT_RSA definition. I had originall sent this in > 2011 [3], but did not follow up at the time. >=20 > Link: http://www.iodata.jp/products/network/rsadv2s.htm [1] > Link: https://pub.ks-and-ks.ne.jp/prog/linux/rsa.en.shtml [2] > Link: https://lore.kernel.org/all/1309211120-2803-6-git-send-email-arnd@a= rndb.de/ [3] > Cc: Kiyokazu SUTO > Signed-off-by: Arnd Bergmann Sashiko has reviewed this patch and found no issues. --=20 Sashiko AI review =C2=B7 https://sashiko.dev/#/patchset/20261021081746.3278= 002-1-arnd@kernel.org?part=3D1