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 F2331C5ACB3 for ; Wed, 15 Nov 2023 22:04:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344388AbjKOWEN (ORCPT ); Wed, 15 Nov 2023 17:04:13 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55300 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344386AbjKOWEM (ORCPT ); Wed, 15 Nov 2023 17:04:12 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2B3DB193 for ; Wed, 15 Nov 2023 14:04:09 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A38ACC433C9; Wed, 15 Nov 2023 22:04:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1700085848; bh=A8of6eC+7jUBvIl8y70Y5nkBkIwcKGt0wgw5/lGj5ko=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=phaxFynIalAR7OdM3yzVj6Ek3jNMEhY8JSn7YQE61kpJHJ5FYi5iO9bbn5j/WyXbf +agYgV0ZNwa/y/rv6/CkZuf1MLLAwfQIYO1zq9F2GILu4sU0GIJnLRrHO0S6oRch1q O2q6MvM9GSa27ZP3gf4ngrgXJOwXeaBtr471P+mY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ben Wolsieffer , Mark Brown , Sasha Levin Subject: [PATCH 5.4 094/119] regmap: prevent noinc writes from clobbering cache Date: Wed, 15 Nov 2023 17:01:24 -0500 Message-ID: <20231115220135.550577696@linuxfoundation.org> X-Mailer: git-send-email 2.42.1 In-Reply-To: <20231115220132.607437515@linuxfoundation.org> References: <20231115220132.607437515@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 5.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ben Wolsieffer [ Upstream commit 984a4afdc87a1fc226fd657b1cd8255c13d3fc1a ] Currently, noinc writes are cached as if they were standard incrementing writes, overwriting unrelated register values in the cache. Instead, we want to cache the last value written to the register, as is done in the accelerated noinc handler (regmap_noinc_readwrite). Fixes: cdf6b11daa77 ("regmap: Add regmap_noinc_write API") Signed-off-by: Ben Wolsieffer Link: https://lore.kernel.org/r/20231101142926.2722603-2-ben.wolsieffer@hefring.com Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/base/regmap/regmap.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index b5974cbbe78f6..23574c328616f 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -1495,17 +1495,19 @@ static int _regmap_raw_write_impl(struct regmap *map, unsigned int reg, } if (!map->cache_bypass && map->format.parse_val) { - unsigned int ival; + unsigned int ival, offset; int val_bytes = map->format.val_bytes; - for (i = 0; i < val_len / val_bytes; i++) { - ival = map->format.parse_val(val + (i * val_bytes)); - ret = regcache_write(map, - reg + regmap_get_offset(map, i), - ival); + + /* Cache the last written value for noinc writes */ + i = noinc ? val_len - val_bytes : 0; + for (; i < val_len; i += val_bytes) { + ival = map->format.parse_val(val + i); + offset = noinc ? 0 : regmap_get_offset(map, i / val_bytes); + ret = regcache_write(map, reg + offset, ival); if (ret) { dev_err(map->dev, "Error in caching of register: %x ret: %d\n", - reg + regmap_get_offset(map, i), ret); + reg + offset, ret); return ret; } } -- 2.42.0