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Tue, 22 Sep 2020 09:05:03 -0400 X-MC-Unique: ekLOwJ-ZOUmFj7gP2au11g-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 2A5561891E88; Tue, 22 Sep 2020 13:05:02 +0000 (UTC) Received: from gshan.redhat.com (vpn2-54-30.bne.redhat.com [10.64.54.30]) by smtp.corp.redhat.com (Postfix) with ESMTP id 187CD73670; Tue, 22 Sep 2020 13:04:59 +0000 (UTC) From: Gavin Shan To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v5 08/13] firmware: arm_sdei: Remove while loop in sdei_event_register() Date: Tue, 22 Sep 2020 23:04:18 +1000 Message-Id: <20200922130423.10173-9-gshan@redhat.com> In-Reply-To: <20200922130423.10173-1-gshan@redhat.com> References: <20200922130423.10173-1-gshan@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200922_090508_450975_859E2882 X-CRM114-Status: GOOD ( 13.22 ) X-Spam-Score: -1.7 (-) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-1.7 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [207.211.31.120 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -1.5 DKIMWL_WL_HIGH DKIMwl.org - High trust sender X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, catalin.marinas@arm.com, linux-kernel@vger.kernel.org, james.morse@arm.com, shan.gavin@gmail.com, Jonathan.Cameron@huawei.com, will@kernel.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org This removes the unnecessary while loop in sdei_event_register() because of the following two reasons. This shouldn't cause any functional changes. * The while loop is executed for once, meaning it's not needed in theory. * With the while loop removed, the nested statements can be avoid to make the code a bit cleaner. Signed-off-by: Gavin Shan Reviewed-by: Jonathan Cameron --- drivers/firmware/arm_sdei.c | 52 ++++++++++++++++++------------------- 1 file changed, 25 insertions(+), 27 deletions(-) diff --git a/drivers/firmware/arm_sdei.c b/drivers/firmware/arm_sdei.c index 4caeef3e1e0b..6595bd66aa73 100644 --- a/drivers/firmware/arm_sdei.c +++ b/drivers/firmware/arm_sdei.c @@ -590,36 +590,34 @@ int sdei_event_register(u32 event_num, sdei_event_callback *cb, void *arg) WARN_ON(in_nmi()); mutex_lock(&sdei_events_lock); - do { - if (sdei_event_find(event_num)) { - pr_warn("Event %u already registered\n", event_num); - err = -EBUSY; - break; - } + if (sdei_event_find(event_num)) { + pr_warn("Event %u already registered\n", event_num); + err = -EBUSY; + goto unlock; + } - event = sdei_event_create(event_num, cb, arg); - if (IS_ERR(event)) { - err = PTR_ERR(event); - pr_warn("Failed to create event %u: %d\n", event_num, - err); - break; - } + event = sdei_event_create(event_num, cb, arg); + if (IS_ERR(event)) { + err = PTR_ERR(event); + pr_warn("Failed to create event %u: %d\n", event_num, err); + goto unlock; + } - cpus_read_lock(); - err = _sdei_event_register(event); - if (err) { - sdei_event_destroy(event); - pr_warn("Failed to register event %u: %d\n", event_num, - err); - } else { - spin_lock(&sdei_list_lock); - event->reregister = true; - spin_unlock(&sdei_list_lock); - } - cpus_read_unlock(); - } while (0); - mutex_unlock(&sdei_events_lock); + cpus_read_lock(); + err = _sdei_event_register(event); + if (err) { + sdei_event_destroy(event); + pr_warn("Failed to register event %u: %d\n", event_num, err); + goto cpu_unlock; + } + spin_lock(&sdei_list_lock); + event->reregister = true; + spin_unlock(&sdei_list_lock); +cpu_unlock: + cpus_read_unlock(); +unlock: + mutex_unlock(&sdei_events_lock); return err; }