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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 1DDA7C47084 for ; Mon, 24 May 2021 15:14:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 02E50613BF for ; Mon, 24 May 2021 15:14:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234438AbhEXPPq (ORCPT ); Mon, 24 May 2021 11:15:46 -0400 Received: from mail.kernel.org ([198.145.29.99]:40870 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234150AbhEXPGx (ORCPT ); Mon, 24 May 2021 11:06:53 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 3F233616E9; Mon, 24 May 2021 14:51:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1621867878; bh=sFBDKRlr2yCxCkhrMba95+PZDRbdIVMxsq7Qo0+qhxg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=h8AIwXoBal0O9Bkr3hiTHjueB+C3np7zv/SlTHa6coG4iridLY2WL6TuKbdKCyNxw iPFgckky4eASPvEpynqMO2h0q15EVirDmSMzwD+4XPiOkPSSu1/CMffet14KjKGv21 VxNrQL2AZp95+8uJ7G61VQzo7X5HTM2eaHbnqrn2tbfUE4FwszE0tDR9DA+PH++v3/ TIPgrpJkJokVjpkF8JRV8V8ZwKnEqMud4e6UNqlejC1CVjpmqCgqxq2Hz53gPP2B3p AFbezmlYSmzSS9oR9tPR/F/+/bqogORl6tucGbYpFwR+mJB8dBVH79QelOHMT/GW30 MmWCfKAh0urOg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Phillip Potter , Vinod Koul , Sinan Kaya , Greg Kroah-Hartman , Sasha Levin , linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, dmaengine@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 09/19] dmaengine: qcom_hidma: comment platform_driver_register call Date: Mon, 24 May 2021 10:50:56 -0400 Message-Id: <20210524145106.2499571-9-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210524145106.2499571-1-sashal@kernel.org> References: <20210524145106.2499571-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org From: Phillip Potter [ Upstream commit 4df2a8b0ad634d98a67e540a4e18a60f943e7d9f ] Place a comment in hidma_mgmt_init explaining why success must currently be assumed, due to the cleanup issue that would need to be considered were this module ever to be unloadable or were this platform_driver_register call ever to fail. Acked-By: Vinod Koul Acked-By: Sinan Kaya Signed-off-by: Phillip Potter Link: https://lore.kernel.org/r/20210503115736.2104747-52-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/dma/qcom/hidma_mgmt.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/dma/qcom/hidma_mgmt.c b/drivers/dma/qcom/hidma_mgmt.c index 82f36e466083..143ea7cad756 100644 --- a/drivers/dma/qcom/hidma_mgmt.c +++ b/drivers/dma/qcom/hidma_mgmt.c @@ -398,6 +398,20 @@ static int __init hidma_mgmt_init(void) of_node_put(child); } #endif + /* + * We do not check for return value here, as it is assumed that + * platform_driver_register must not fail. The reason for this is that + * the (potential) hidma_mgmt_of_populate_channels calls above are not + * cleaned up if it does fail, and to do this work is quite + * complicated. In particular, various calls of of_address_to_resource, + * of_irq_to_resource, platform_device_register_full, of_dma_configure, + * and of_msi_configure which then call other functions and so on, must + * be cleaned up - this is not a trivial exercise. + * + * Currently, this module is not intended to be unloaded, and there is + * no module_exit function defined which does the needed cleanup. For + * this reason, we have to assume success here. + */ platform_driver_register(&hidma_mgmt_driver); return 0; -- 2.30.2 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=-17.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 7C5A5C04FF3 for ; Mon, 24 May 2021 19:05:13 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 43EA5613F5 for ; Mon, 24 May 2021 19:05:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 43EA5613F5 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=fpjMAifhe00KFH8x6KYutYb/AW+a8CBq20sXHo5UvlU=; b=tVGRTP+HwkICVH 4//9eYvdgnBHjg9t7Xjk7CJHF4+vk4pb6pJzssnQTP7R0OYnylndjnQhQwRZVDFb6PQk7QcsK44ZY TBdqYW4aA7r1aK6yES+wzwrxVzSCbJYAAd0h7ki+K0phtlYrepShNXAaWzmXSbbJ0YhIVGREsoY/E cXPz9LRxuNNpl2V0H2Whb10Ja6d2vw1Z/gAu5von6Xvz27WonmMXKq+muG1TIArdF61fiWgac0yQe eit4v9DTlOBT8jH1tzpnGI0msuT8zOuzLrmAi0XrvIp2i0cKR3UvNaBDTTfV1SQIb52JuLs/FB+Rb jNLDxybPfnYypMjV8AZQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1llFrA-001aaS-9E; Mon, 24 May 2021 19:03:17 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1llBvK-0010ef-GN for linux-arm-kernel@lists.infradead.org; Mon, 24 May 2021 14:51:20 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 3F233616E9; Mon, 24 May 2021 14:51:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1621867878; bh=sFBDKRlr2yCxCkhrMba95+PZDRbdIVMxsq7Qo0+qhxg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=h8AIwXoBal0O9Bkr3hiTHjueB+C3np7zv/SlTHa6coG4iridLY2WL6TuKbdKCyNxw iPFgckky4eASPvEpynqMO2h0q15EVirDmSMzwD+4XPiOkPSSu1/CMffet14KjKGv21 VxNrQL2AZp95+8uJ7G61VQzo7X5HTM2eaHbnqrn2tbfUE4FwszE0tDR9DA+PH++v3/ TIPgrpJkJokVjpkF8JRV8V8ZwKnEqMud4e6UNqlejC1CVjpmqCgqxq2Hz53gPP2B3p AFbezmlYSmzSS9oR9tPR/F/+/bqogORl6tucGbYpFwR+mJB8dBVH79QelOHMT/GW30 MmWCfKAh0urOg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Phillip Potter , Vinod Koul , Sinan Kaya , Greg Kroah-Hartman , Sasha Levin , linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, dmaengine@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 09/19] dmaengine: qcom_hidma: comment platform_driver_register call Date: Mon, 24 May 2021 10:50:56 -0400 Message-Id: <20210524145106.2499571-9-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210524145106.2499571-1-sashal@kernel.org> References: <20210524145106.2499571-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210524_075118_608208_EDCBCD8B X-CRM114-Status: GOOD ( 13.08 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Phillip Potter [ Upstream commit 4df2a8b0ad634d98a67e540a4e18a60f943e7d9f ] Place a comment in hidma_mgmt_init explaining why success must currently be assumed, due to the cleanup issue that would need to be considered were this module ever to be unloadable or were this platform_driver_register call ever to fail. Acked-By: Vinod Koul Acked-By: Sinan Kaya Signed-off-by: Phillip Potter Link: https://lore.kernel.org/r/20210503115736.2104747-52-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/dma/qcom/hidma_mgmt.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/dma/qcom/hidma_mgmt.c b/drivers/dma/qcom/hidma_mgmt.c index 82f36e466083..143ea7cad756 100644 --- a/drivers/dma/qcom/hidma_mgmt.c +++ b/drivers/dma/qcom/hidma_mgmt.c @@ -398,6 +398,20 @@ static int __init hidma_mgmt_init(void) of_node_put(child); } #endif + /* + * We do not check for return value here, as it is assumed that + * platform_driver_register must not fail. The reason for this is that + * the (potential) hidma_mgmt_of_populate_channels calls above are not + * cleaned up if it does fail, and to do this work is quite + * complicated. In particular, various calls of of_address_to_resource, + * of_irq_to_resource, platform_device_register_full, of_dma_configure, + * and of_msi_configure which then call other functions and so on, must + * be cleaned up - this is not a trivial exercise. + * + * Currently, this module is not intended to be unloaded, and there is + * no module_exit function defined which does the needed cleanup. For + * this reason, we have to assume success here. + */ platform_driver_register(&hidma_mgmt_driver); return 0; -- 2.30.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel