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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 D0C62C742BA for ; Fri, 12 Jul 2019 12:31:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AA35E208E4 for ; Fri, 12 Jul 2019 12:31:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1562934681; bh=kHmhzJ+BlbwwuCrF47YLjZgNe7oXTK2407h6My7ZG7c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=2JAdZK3ONGEHr0Dv369WVvXFc/olNey6TPfR3Jdzdp1mnG93RwjwJFzvrYJ78UbPd pDiS/tjYswjpNU9XUOlQF62w8XrMj4Dlzf+l0ZGGmujmNyYNsdHsEVhkwJkC+CAgi4 eUgkv7WExjhvzKoc+pdCUYPgN1EECouuhfCIcRBA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729133AbfGLMbU (ORCPT ); Fri, 12 Jul 2019 08:31:20 -0400 Received: from mail.kernel.org ([198.145.29.99]:47844 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729105AbfGLMbR (ORCPT ); Fri, 12 Jul 2019 08:31:17 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 6398D208E4; Fri, 12 Jul 2019 12:31:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1562934676; bh=kHmhzJ+BlbwwuCrF47YLjZgNe7oXTK2407h6My7ZG7c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iUboyDUUZ6I0JhejthnMy0qlBKFdY4sFLbUo1elxTOltRpPKPkSHGPfcW8hO3Fy98 MiopKC4ogpCkcuLp5sPiPrIaZMwvB7DIHRSESLG26JdlXvUTOMcO9/LZaS8gBQhudh 7dx40wTBJjVsTsHOICeQG39oUI7+2LP7zyj++LzQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dave Stevenson , Stefan Wahren , Hans Verkuil , Mauro Carvalho Chehab Subject: [PATCH 5.1 134/138] staging: bcm2835-camera: Replace spinlock protecting context_map with mutex Date: Fri, 12 Jul 2019 14:19:58 +0200 Message-Id: <20190712121633.856051273@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190712121628.731888964@linuxfoundation.org> References: <20190712121628.731888964@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Dave Stevenson commit 8dedab2903f152aa3cee9ae3d57c828dea0d356e upstream. The commit "staging: bcm2835-camera: Replace open-coded idr with a struct idr." replaced an internal implementation of an idr with the standard functions and a spinlock. idr_alloc(GFP_KERNEL) can sleep whilst calling kmem_cache_alloc to allocate the new node, but this is not valid whilst in an atomic context due to the spinlock. There is no need for this to be a spinlock as a standard mutex is sufficient. Fixes: 950fd867c635 ("staging: bcm2835-camera: Replace open-coded idr with a struct idr.") Signed-off-by: Dave Stevenson Signed-off-by: Stefan Wahren Acked-by: Hans Verkuil Acked-by: Mauro Carvalho Chehab Signed-off-by: Greg Kroah-Hartman --- drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) --- a/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c +++ b/drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c @@ -161,7 +161,8 @@ struct vchiq_mmal_instance { void *bulk_scratch; struct idr context_map; - spinlock_t context_map_lock; + /* protect accesses to context_map */ + struct mutex context_map_lock; /* component to use next */ int component_idx; @@ -184,10 +185,10 @@ get_msg_context(struct vchiq_mmal_instan * that when we service the VCHI reply, we can look up what * message is being replied to. */ - spin_lock(&instance->context_map_lock); + mutex_lock(&instance->context_map_lock); handle = idr_alloc(&instance->context_map, msg_context, 0, 0, GFP_KERNEL); - spin_unlock(&instance->context_map_lock); + mutex_unlock(&instance->context_map_lock); if (handle < 0) { kfree(msg_context); @@ -211,9 +212,9 @@ release_msg_context(struct mmal_msg_cont { struct vchiq_mmal_instance *instance = msg_context->instance; - spin_lock(&instance->context_map_lock); + mutex_lock(&instance->context_map_lock); idr_remove(&instance->context_map, msg_context->handle); - spin_unlock(&instance->context_map_lock); + mutex_unlock(&instance->context_map_lock); kfree(msg_context); } @@ -1849,7 +1850,7 @@ int vchiq_mmal_init(struct vchiq_mmal_in instance->bulk_scratch = vmalloc(PAGE_SIZE); - spin_lock_init(&instance->context_map_lock); + mutex_init(&instance->context_map_lock); idr_init_base(&instance->context_map, 1); params.callback_param = instance;