From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D6FB8C7EE23 for ; Wed, 7 Jun 2023 20:37:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234018AbjFGUhS (ORCPT ); Wed, 7 Jun 2023 16:37:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36322 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233985AbjFGUhR (ORCPT ); Wed, 7 Jun 2023 16:37:17 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ABF0A10FB for ; Wed, 7 Jun 2023 13:36:49 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 8ADE36459A for ; Wed, 7 Jun 2023 20:36:49 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9BE43C433D2; Wed, 7 Jun 2023 20:36:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1686170209; bh=xxkTOTuDzkk0xuOOJYaHKX1RPtOVfkpEK6aADUWPDUI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Onz8j2PX4pgNaO/h3uYELGzGPJVHay9NbX5FZsSLpYJP8anHMMQGGVZtuaysMagUb f5ZsAikw4Z4DsO8LYxY+84cdpaCHTdMTI4/OoDq9HouFpgA+bzxVxK7apO8CLlJUfT oMt++A7IwxP6AXHOjGNfMAya9Bhz04pU3FpGY8As= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev Subject: [PATCH 4.19 85/88] regmap: Account for register length when chunking Date: Wed, 7 Jun 2023 22:16:42 +0200 Message-ID: <20230607200901.877511483@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230607200854.030202132@linuxfoundation.org> References: <20230607200854.030202132@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Jim Wylder commit 3981514180c987a79ea98f0ae06a7cbf58a9ac0f upstream. Currently, when regmap_raw_write() splits the data, it uses the max_raw_write value defined for the bus. For any bus that includes the target register address in the max_raw_write value, the chunked transmission will always exceed the maximum transmission length. To avoid this problem, subtract the length of the register and the padding from the maximum transmission. Signed-off-by: Jim Wylder --- drivers/base/regmap/regmap.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -1825,6 +1825,8 @@ int _regmap_raw_write(struct regmap *map size_t val_count = val_len / val_bytes; size_t chunk_count, chunk_bytes; size_t chunk_regs = val_count; + size_t max_data = map->max_raw_write - map->format.reg_bytes - + map->format.pad_bytes; int ret, i; if (!val_count) @@ -1832,8 +1834,8 @@ int _regmap_raw_write(struct regmap *map if (map->use_single_write) chunk_regs = 1; - else if (map->max_raw_write && val_len > map->max_raw_write) - chunk_regs = map->max_raw_write / val_bytes; + else if (map->max_raw_write && val_len > max_data) + chunk_regs = max_data / val_bytes; chunk_count = val_count / chunk_regs; chunk_bytes = chunk_regs * val_bytes;