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Lin" , Singo Chang , Nancy Lin , Shawn Sung , , , , , , Fei Shao Subject: [PATCH v2] mailbox: mtk-cmdq: Fix sleeping function called from invalid context Date: Wed, 8 May 2024 17:51:43 +0800 Message-ID: <20240508095143.12023-1-jason-jh.lin@mediatek.com> X-Mailer: git-send-email 2.18.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain X-MTK: N When we run kernel with lockdebug option, we will get the BUG below: [ 106.692124] BUG: sleeping function called from invalid context at drivers/base/power/runtime.c:1164 [ 106.692190] in_atomic(): 1, irqs_disabled(): 128, non_block: 0, pid: 3616, name: kworker/u17:3 [ 106.692226] preempt_count: 1, expected: 0 [ 106.692254] RCU nest depth: 0, expected: 0 [ 106.692282] INFO: lockdep is turned off. [ 106.692306] irq event stamp: 0 [ 106.692331] hardirqs last enabled at (0): [<0000000000000000>] 0x0 [ 106.692376] hardirqs last disabled at (0): [] copy_process+0xc90/0x2ac0 [ 106.692429] softirqs last enabled at (0): [] copy_process+0xcb4/0x2ac0 [ 106.692473] softirqs last disabled at (0): [<0000000000000000>] 0x0 [ 106.692513] CPU: 1 PID: 3616 Comm: kworker/u17:3 Not tainted 6.1.87-lockdep-14133-g26e933aca785 #1 6839942e1cf34914b0a366137843dd2366f52aa9 [ 106.692556] Hardware name: Google Ciri sku0/unprovisioned board (DT) [ 106.692586] Workqueue: imgsys_runner imgsys_runner_func [ 106.692638] Call trace: [ 106.692662] dump_backtrace+0x100/0x120 [ 106.692702] show_stack+0x20/0x2c [ 106.692737] dump_stack_lvl+0x84/0xb4 [ 106.692775] dump_stack+0x18/0x48 [ 106.692809] __might_resched+0x354/0x4c0 [ 106.692847] __might_sleep+0x98/0xe4 [ 106.692883] __pm_runtime_resume+0x70/0x124 [ 106.692921] cmdq_mbox_send_data+0xe4/0xb1c [ 106.692964] msg_submit+0x194/0x2dc [ 106.693003] mbox_send_message+0x190/0x330 [ 106.693043] imgsys_cmdq_sendtask+0x1618/0x2224 [ 106.693082] imgsys_runner_func+0xac/0x11c [ 106.693118] process_one_work+0x638/0xf84 [ 106.693158] worker_thread+0x808/0xcd0 [ 106.693196] kthread+0x24c/0x324 [ 106.693231] ret_from_fork+0x10/0x20 We found that there is a spin_lock_irqsave protection in msg_submit() of mailbox.c and it is in the atomic context. So when cmdq driver calls pm_runtime_get_sync() in cmdq_mbox_send_data(), it will get this BUG report. 1. Change pm_runtime_get_sync() to pm_runtime_get() to avoid using sleep in atomic context. 2. Move clk_bulk_enable() outside cmdq_runtime_resume() to ensure GCE clocks are enabled before configuring GCE register. 3. Add used_count to avoid cmdq_runtime_suspend() being called before calling cmdq_runtime_resume(). Fixes: 8afe816b0c99 ("mailbox: mtk-cmdq-mailbox: Implement Runtime PM with autosuspend") Signed-off-by: Jason-JH.Lin --- drivers/mailbox/mtk-cmdq-mailbox.c | 24 +++++++++++++++--------- 1 file changed, 15 insertions(+), 9 deletions(-) diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c b/drivers/mailbox/mtk-cmdq-mailbox.c index 033aff11f87c..b50f42e69aab 100644 --- a/drivers/mailbox/mtk-cmdq-mailbox.c +++ b/drivers/mailbox/mtk-cmdq-mailbox.c @@ -82,6 +82,7 @@ struct cmdq { const struct gce_plat *pdata; struct cmdq_thread *thread; struct clk_bulk_data clocks[CMDQ_GCE_NUM_MAX]; + atomic_t used_count; bool suspended; }; @@ -317,14 +318,21 @@ static int cmdq_runtime_resume(struct device *dev) { struct cmdq *cmdq = dev_get_drvdata(dev); - return clk_bulk_enable(cmdq->pdata->gce_num, cmdq->clocks); + atomic_inc(&cmdq->used_count); + return 0; } static int cmdq_runtime_suspend(struct device *dev) { struct cmdq *cmdq = dev_get_drvdata(dev); + if (atomic_read(&cmdq->used_count) == 0) { + dev_warn(dev, "%s when used_count is 0!", __func__); + return -EINVAL; + } + clk_bulk_disable(cmdq->pdata->gce_num, cmdq->clocks); + atomic_dec(&cmdq->used_count); return 0; } @@ -392,9 +400,8 @@ static int cmdq_mbox_send_data(struct mbox_chan *chan, void *data) /* Client should not flush new tasks if suspended. */ WARN_ON(cmdq->suspended); - ret = pm_runtime_get_sync(cmdq->mbox.dev); - if (ret < 0) - return ret; + WARN_ON(pm_runtime_get(cmdq->mbox.dev) < 0); + WARN_ON(clk_bulk_enable(cmdq->pdata->gce_num, cmdq->clocks)); task = kzalloc(sizeof(*task), GFP_ATOMIC); if (!task) { @@ -465,7 +472,8 @@ static void cmdq_mbox_shutdown(struct mbox_chan *chan) struct cmdq_task *task, *tmp; unsigned long flags; - WARN_ON(pm_runtime_get_sync(cmdq->mbox.dev) < 0); + WARN_ON(pm_runtime_get(cmdq->mbox.dev) < 0); + WARN_ON(clk_bulk_enable(cmdq->pdata->gce_num, cmdq->clocks)); spin_lock_irqsave(&thread->chan->lock, flags); if (list_empty(&thread->task_busy_list)) @@ -507,11 +515,9 @@ static int cmdq_mbox_flush(struct mbox_chan *chan, unsigned long timeout) struct cmdq_task *task, *tmp; unsigned long flags; u32 enable; - int ret; - ret = pm_runtime_get_sync(cmdq->mbox.dev); - if (ret < 0) - return ret; + WARN_ON(pm_runtime_get(cmdq->mbox.dev) < 0); + WARN_ON(clk_bulk_enable(cmdq->pdata->gce_num, cmdq->clocks)); spin_lock_irqsave(&thread->chan->lock, flags); if (list_empty(&thread->task_busy_list)) -- 2.18.0