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Fri, 11 Apr 2025 09:17:32 -0400 X-MC-Unique: xSJHeetwPd2MxncaHr6QqA-1 X-Mimecast-MFC-AGG-ID: xSJHeetwPd2MxncaHr6QqA_1744377442 Received: from mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.93]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 863C81800EC5; Fri, 11 Apr 2025 13:17:21 +0000 (UTC) Received: from [10.45.225.124] (unknown [10.45.225.124]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 55E621828ABC; Fri, 11 Apr 2025 13:17:16 +0000 (UTC) Message-ID: <46ff3480-caca-4e2c-9382-2897c611758a@redhat.com> Date: Fri, 11 Apr 2025 15:17:14 +0200 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 07/14] mfd: zl3073x: Add components versions register defs From: Ivan Vecera To: Andy Shevchenko Cc: netdev@vger.kernel.org, Vadim Fedorenko , Arkadiusz Kubalewski , Jiri Pirko , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Prathosh Satish , Lee Jones , Kees Cook , Andy Shevchenko , Andrew Morton , Michal Schmidt , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, Andrew Lunn References: <20250409144250.206590-1-ivecera@redhat.com> <20250409144250.206590-8-ivecera@redhat.com> Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 On 11. 04. 25 1:19 odp., Ivan Vecera wrote: > The range for regmap 1: (registers 0x000-0x4FF) > regmap_range_cfg { >     .range_min = 0, >     .range_max = 10 * 128 - 1, /* 10 pages, 128 registers each */ >     .selector_reg = 0x7f,      /* page selector at each page */ >     .selector_shift = 0,       /* no shift in page selector */ >     .selector_mask = GENMASK(3, 0),    /* 4 bits for page sel */ >     .window_start = 0,         /* 128 regs from 0x00-0x7f */ >     .window_len = 128, > }; > > The range for regmap 2: (registers 0x500-0x77F) > regmap_range_cfg { >     .range_min = 10 * 128, >     .range_max = 15 * 128 - 1, /* 5 pages, 128 registers each */ >     .selector_reg = 0x7f,      /* page selector at each page */ >     .selector_shift = 0,       /* no shift in page selector */ >     .selector_mask = GENMASK(3, 0),    /* 4 bits for page sel */ >     .window_start = 0,         /* 128 regs from 0x00-0x7f */ >     .window_len = 128, > }; > > Is it now OK? No this is not good... I cannot use 2 ranges. This is not safe... if the caller use regmap 2 to read/write something below 0x500 (by mistake), no mapping is applied and value is directly used as register number that's wrong :-(. Should I use rather single mapping range to cover all pages and ensure at driver level that regmap 2 is not used for regs < 0x500? -or- what would be the best approach? I.