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 X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CA2ABC2BA83 for ; Fri, 14 Feb 2020 16:46:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8EAE024682 for ; Fri, 14 Feb 2020 16:46:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581698802; bh=dFYtIWFy2BER3tZTIWKN+5yoO3kFDbgxCTEuKu9oAsA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=MXOgMhrbyMvaEEsluNyiCvUwhj6Ura06rR6ERsnL1ScofUoTbWPVZ4HscF4UVKnOb ZshpFencZtHbPtme5IgeuZPFMtBgNv8nO2CSd91W3/VVaqLpwovv6rW8DHVIRuwInr yLjXxlxYqhcFp0tCKkj1fUftyX8yfH1h7HIhR9uI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392940AbgBNQV2 (ORCPT ); Fri, 14 Feb 2020 11:21:28 -0500 Received: from mail.kernel.org ([198.145.29.99]:55960 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2392935AbgBNQV1 (ORCPT ); Fri, 14 Feb 2020 11:21:27 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 98D30246B1; Fri, 14 Feb 2020 16:21:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581697286; bh=dFYtIWFy2BER3tZTIWKN+5yoO3kFDbgxCTEuKu9oAsA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=N+7f9YlRhBQgfm29ZeNe/WqRPLN+tvc1WYk7Z9lqBBEBEV8NsJnVDcKhsmOzLj1xB Hb8QzQeNbu/3chMyiQgcE9+Izr8v7s87YKD6K8/ocSCqN0fNPAQIi6Y9jGXViz0Dye bhzhScuUZgL3yTd4POEi9Y/ZDlLL+pY59IKpRPDM= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Rasmus Villemoes , Timur Tabi , Li Yang , Sasha Levin , linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH AUTOSEL 4.9 003/141] soc: fsl: qe: change return type of cpm_muram_alloc() to s32 Date: Fri, 14 Feb 2020 11:19:03 -0500 Message-Id: <20200214162122.19794-3-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200214162122.19794-1-sashal@kernel.org> References: <20200214162122.19794-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Rasmus Villemoes [ Upstream commit 800cd6fb76f0ec7711deb72a86c924db1ae42648 ] There are a number of problems with cpm_muram_alloc() and its callers. Most callers assign the return value to some variable and then use IS_ERR_VALUE to check for allocation failure. However, when that variable is not sizeof(long), this leads to warnings - and it is indeed broken to do e.g. u32 foo = cpm_muram_alloc(); if (IS_ERR_VALUE(foo)) on a 64-bit platform, since the condition foo >= (unsigned long)-ENOMEM is tautologically false. There are also callers that ignore the possibility of error, and then there are those that check for error by comparing the return value to 0... One could fix that by changing all callers to store the return value temporarily in an "unsigned long" and test that. However, use of IS_ERR_VALUE() is error-prone and should be restricted to things which are inherently long-sized (stuff in pt_regs etc.). Instead, let's aim for changing to the standard kernel style int foo = cpm_muram_alloc(); if (foo < 0) deal_with_it() some->where = foo; Changing the return type from unsigned long to s32 (aka signed int) doesn't change the value that gets stored into any of the callers' variables except if the caller was storing the result in a u64 _and_ the allocation failed, so in itself this patch should be a no-op. Another problem with cpm_muram_alloc() is that it can certainly validly return 0 - and except if some cpm_muram_alloc_fixed() call interferes, the very first cpm_muram_alloc() call will return just that. But that shows that both ucc_slow_free() and ucc_fast_free() are buggy, since they assume that a value of 0 means "that field was never allocated". We'll later change cpm_muram_free() to accept (and ignore) a negative offset, so callers can use a sentinel of -1 instead of 0 and just unconditionally call cpm_muram_free(). Reviewed-by: Timur Tabi Signed-off-by: Rasmus Villemoes Signed-off-by: Li Yang Signed-off-by: Sasha Levin --- drivers/soc/fsl/qe/qe_common.c | 29 ++++++++++++++++------------- include/soc/fsl/qe/qe.h | 16 ++++++++-------- 2 files changed, 24 insertions(+), 21 deletions(-) diff --git a/drivers/soc/fsl/qe/qe_common.c b/drivers/soc/fsl/qe/qe_common.c index 104e68d9b84f2..4f60724b06b7c 100644 --- a/drivers/soc/fsl/qe/qe_common.c +++ b/drivers/soc/fsl/qe/qe_common.c @@ -35,7 +35,7 @@ static phys_addr_t muram_pbase; struct muram_block { struct list_head head; - unsigned long start; + s32 start; int size; }; @@ -113,13 +113,14 @@ int cpm_muram_init(void) * @algo: algorithm for alloc. * @data: data for genalloc's algorithm. * - * This function returns an offset into the muram area. + * This function returns a non-negative offset into the muram area, or + * a negative errno on failure. */ -static unsigned long cpm_muram_alloc_common(unsigned long size, - genpool_algo_t algo, void *data) +static s32 cpm_muram_alloc_common(unsigned long size, + genpool_algo_t algo, void *data) { struct muram_block *entry; - unsigned long start; + s32 start; if (!muram_pool && cpm_muram_init()) goto out2; @@ -140,7 +141,7 @@ static unsigned long cpm_muram_alloc_common(unsigned long size, out1: gen_pool_free(muram_pool, start, size); out2: - return (unsigned long)-ENOMEM; + return -ENOMEM; } /* @@ -148,13 +149,14 @@ static unsigned long cpm_muram_alloc_common(unsigned long size, * @size: number of bytes to allocate * @align: requested alignment, in bytes * - * This function returns an offset into the muram area. + * This function returns a non-negative offset into the muram area, or + * a negative errno on failure. * Use cpm_dpram_addr() to get the virtual address of the area. * Use cpm_muram_free() to free the allocation. */ -unsigned long cpm_muram_alloc(unsigned long size, unsigned long align) +s32 cpm_muram_alloc(unsigned long size, unsigned long align) { - unsigned long start; + s32 start; unsigned long flags; struct genpool_data_align muram_pool_data; @@ -171,7 +173,7 @@ EXPORT_SYMBOL(cpm_muram_alloc); * cpm_muram_free - free a chunk of multi-user ram * @offset: The beginning of the chunk as returned by cpm_muram_alloc(). */ -int cpm_muram_free(unsigned long offset) +int cpm_muram_free(s32 offset) { unsigned long flags; int size; @@ -197,13 +199,14 @@ EXPORT_SYMBOL(cpm_muram_free); * cpm_muram_alloc_fixed - reserve a specific region of multi-user ram * @offset: offset of allocation start address * @size: number of bytes to allocate - * This function returns an offset into the muram area + * This function returns @offset if the area was available, a negative + * errno otherwise. * Use cpm_dpram_addr() to get the virtual address of the area. * Use cpm_muram_free() to free the allocation. */ -unsigned long cpm_muram_alloc_fixed(unsigned long offset, unsigned long size) +s32 cpm_muram_alloc_fixed(unsigned long offset, unsigned long size) { - unsigned long start; + s32 start; unsigned long flags; struct genpool_data_fixed muram_pool_data_fixed; diff --git a/include/soc/fsl/qe/qe.h b/include/soc/fsl/qe/qe.h index 226f915a68c28..55907f7ace82e 100644 --- a/include/soc/fsl/qe/qe.h +++ b/include/soc/fsl/qe/qe.h @@ -102,26 +102,26 @@ static inline void qe_reset(void) {} int cpm_muram_init(void); #if defined(CONFIG_CPM) || defined(CONFIG_QUICC_ENGINE) -unsigned long cpm_muram_alloc(unsigned long size, unsigned long align); -int cpm_muram_free(unsigned long offset); -unsigned long cpm_muram_alloc_fixed(unsigned long offset, unsigned long size); +s32 cpm_muram_alloc(unsigned long size, unsigned long align); +int cpm_muram_free(s32 offset); +s32 cpm_muram_alloc_fixed(unsigned long offset, unsigned long size); void __iomem *cpm_muram_addr(unsigned long offset); unsigned long cpm_muram_offset(void __iomem *addr); dma_addr_t cpm_muram_dma(void __iomem *addr); #else -static inline unsigned long cpm_muram_alloc(unsigned long size, - unsigned long align) +static inline s32 cpm_muram_alloc(unsigned long size, + unsigned long align) { return -ENOSYS; } -static inline int cpm_muram_free(unsigned long offset) +static inline int cpm_muram_free(s32 offset) { return -ENOSYS; } -static inline unsigned long cpm_muram_alloc_fixed(unsigned long offset, - unsigned long size) +static inline s32 cpm_muram_alloc_fixed(unsigned long offset, + unsigned long size) { return -ENOSYS; } -- 2.20.1