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h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Eq00WyCo6hcxiDCDUMRPmi0qrbBDFeudu7D2o12HCiVhgx5hyPk09CSdrCwkmdexm e1eYeDyIRpXMIVLQCm12FB4zn/X5Ye3TrTP4crCGnn6auu/kqknM2AUPJSVgHko5Fw HOHNjfcli5SdkOKdXhCQu+gocWohTCdQFuGGhSG4= From: Allen Pais To: linux-kernel@vger.kernel.org Cc: tj@kernel.org, keescook@chromium.org, vkoul@kernel.org, marcan@marcan.st, sven@svenpeter.dev, florian.fainelli@broadcom.com, rjui@broadcom.com, sbranden@broadcom.com, paul@crapouillou.net, Eugeniy.Paltsev@synopsys.com, manivannan.sadhasivam@linaro.org, vireshk@kernel.org, Frank.Li@nxp.com, leoyang.li@nxp.com, zw@zh-kernel.org, wangzhou1@hisilicon.com, haijie1@huawei.com, shawnguo@kernel.org, s.hauer@pengutronix.de, sean.wang@mediatek.com, matthias.bgg@gmail.com, angelogioacchino.delregno@collabora.com, afaerber@suse.de, logang@deltatee.com, daniel@zonque.org, haojian.zhuang@gmail.com, robert.jarzmik@free.fr, andersson@kernel.org, konrad.dybcio@linaro.org, orsonzhai@gmail.com, baolin.wang@linux.alibaba.com, zhang.lyra@gmail.com, patrice.chotard@foss.st.com, linus.walleij@linaro.org, wens@csie.org, jernej.skrabec@gmail.com, peter.ujfalusi@gmail.com, kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, jassisinghbrar@gmail.com, mchehab@kernel.org, maintainers@bluecherrydvr.com, aubin.constans@microchip.com, ulf.hansson@linaro.org, manuel.lauss@gmail.com, mirq-linux@rere.qmqm.pl, jh80.chung@samsung.com, oakad@yahoo.com, hayashi.kunihiko@socionext.com, mhiramat@kernel.org, brucechang@via.com.tw, HaraldWelte@viatech.com, pierre@ossman.eu, duncan.sands@free.fr, stern@rowland.harvard.edu, oneukum@suse.com, openipmi-developer@lists.sourceforge.net, dmaengine@vger.kernel.org, asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-rpi-kernel@lists.infradead.org, linux-mips@vger.kernel.org, imx@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-mediatek@lists.infradead.org, linux-actions@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-riscv@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-tegra@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-rdma@vger.kernel.org, linux-media@vger.kernel.org, linux-mmc@vger.kernel.org, linux-omap@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-s390@vger.kernel.org, netdev@vger.kernel.org, linux-usb@vger.kernel.org Subject: [PATCH 6/9] ipmi: Convert from tasklet to BH workqueue Date: Wed, 27 Mar 2024 16:03:11 +0000 Message-Id: <20240327160314.9982-7-apais@linux.microsoft.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20240327160314.9982-1-apais@linux.microsoft.com> References: <20240327160314.9982-1-apais@linux.microsoft.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" The only generic interface to execute asynchronously in the BH context is tasklet; however, it's marked deprecated and has some design flaws. To replace tasklets, BH workqueue support was recently added. A BH workqueue behaves similarly to regular workqueues except that the queued work items are executed in the BH context. This patch converts drivers/infiniband/* from tasklet to BH workqueue. Based on the work done by Tejun Heo Branch: https://git.kernel.org/pub/scm/linux/kernel/git/tj/wq.git for-6.10 Signed-off-by: Allen Pais Acked-by: Corey Minyard Tested-by: Corey Minyard --- drivers/char/ipmi/ipmi_msghandler.c | 30 ++++++++++++++--------------- 1 file changed, 15 insertions(+), 15 deletions(-) diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_m= sghandler.c index b0eedc4595b3..fce2a2dbdc82 100644 --- a/drivers/char/ipmi/ipmi_msghandler.c +++ b/drivers/char/ipmi/ipmi_msghandler.c @@ -36,12 +36,13 @@ #include #include #include +#include =20 #define IPMI_DRIVER_VERSION "39.2" =20 static struct ipmi_recv_msg *ipmi_alloc_recv_msg(void); static int ipmi_init_msghandler(void); -static void smi_recv_tasklet(struct tasklet_struct *t); +static void smi_recv_work(struct work_struct *t); static void handle_new_recv_msgs(struct ipmi_smi *intf); static void need_waiter(struct ipmi_smi *intf); static int handle_one_recv_msg(struct ipmi_smi *intf, @@ -498,13 +499,13 @@ struct ipmi_smi { /* * Messages queued for delivery. If delivery fails (out of memory * for instance), They will stay in here to be processed later in a - * periodic timer interrupt. The tasklet is for handling received + * periodic timer interrupt. The work is for handling received * messages directly from the handler. */ spinlock_t waiting_rcv_msgs_lock; struct list_head waiting_rcv_msgs; atomic_t watchdog_pretimeouts_to_deliver; - struct tasklet_struct recv_tasklet; + struct work_struct recv_work; =20 spinlock_t xmit_msgs_lock; struct list_head xmit_msgs; @@ -704,7 +705,7 @@ static void clean_up_interface_data(struct ipmi_smi *in= tf) struct cmd_rcvr *rcvr, *rcvr2; struct list_head list; =20 - tasklet_kill(&intf->recv_tasklet); + cancel_work_sync(&intf->recv_work); =20 free_smi_msg_list(&intf->waiting_rcv_msgs); free_recv_msg_list(&intf->waiting_events); @@ -1319,7 +1320,7 @@ static void free_user(struct kref *ref) { struct ipmi_user *user =3D container_of(ref, struct ipmi_user, refcount); =20 - /* SRCU cleanup must happen in task context. */ + /* SRCU cleanup must happen in work context. */ queue_work(remove_work_wq, &user->remove_work); } =20 @@ -3605,8 +3606,7 @@ int ipmi_add_smi(struct module *owner, intf->curr_seq =3D 0; spin_lock_init(&intf->waiting_rcv_msgs_lock); INIT_LIST_HEAD(&intf->waiting_rcv_msgs); - tasklet_setup(&intf->recv_tasklet, - smi_recv_tasklet); + INIT_WORK(&intf->recv_work, smi_recv_work); atomic_set(&intf->watchdog_pretimeouts_to_deliver, 0); spin_lock_init(&intf->xmit_msgs_lock); INIT_LIST_HEAD(&intf->xmit_msgs); @@ -4779,7 +4779,7 @@ static void handle_new_recv_msgs(struct ipmi_smi *int= f) * To preserve message order, quit if we * can't handle a message. Add the message * back at the head, this is safe because this - * tasklet is the only thing that pulls the + * work is the only thing that pulls the * messages. */ list_add(&smi_msg->link, &intf->waiting_rcv_msgs); @@ -4812,10 +4812,10 @@ static void handle_new_recv_msgs(struct ipmi_smi *i= ntf) } } =20 -static void smi_recv_tasklet(struct tasklet_struct *t) +static void smi_recv_work(struct work_struct *t) { unsigned long flags =3D 0; /* keep us warning-free. */ - struct ipmi_smi *intf =3D from_tasklet(intf, t, recv_tasklet); + struct ipmi_smi *intf =3D from_work(intf, t, recv_work); int run_to_completion =3D intf->run_to_completion; struct ipmi_smi_msg *newmsg =3D NULL; =20 @@ -4866,7 +4866,7 @@ void ipmi_smi_msg_received(struct ipmi_smi *intf, =20 /* * To preserve message order, we keep a queue and deliver from - * a tasklet. + * a work. */ if (!run_to_completion) spin_lock_irqsave(&intf->waiting_rcv_msgs_lock, flags); @@ -4887,9 +4887,9 @@ void ipmi_smi_msg_received(struct ipmi_smi *intf, spin_unlock_irqrestore(&intf->xmit_msgs_lock, flags); =20 if (run_to_completion) - smi_recv_tasklet(&intf->recv_tasklet); + smi_recv_work(&intf->recv_work); else - tasklet_schedule(&intf->recv_tasklet); + queue_work(system_bh_wq, &intf->recv_work); } EXPORT_SYMBOL(ipmi_smi_msg_received); =20 @@ -4899,7 +4899,7 @@ void ipmi_smi_watchdog_pretimeout(struct ipmi_smi *in= tf) return; =20 atomic_set(&intf->watchdog_pretimeouts_to_deliver, 1); - tasklet_schedule(&intf->recv_tasklet); + queue_work(system_bh_wq, &intf->recv_work); } EXPORT_SYMBOL(ipmi_smi_watchdog_pretimeout); =20 @@ -5068,7 +5068,7 @@ static bool ipmi_timeout_handler(struct ipmi_smi *int= f, flags); } =20 - tasklet_schedule(&intf->recv_tasklet); + queue_work(system_bh_wq, &intf->recv_work); =20 return need_timer; } --=20 2.17.1