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Sun, 8 Nov 2026 01:59:55 -0500 (EST) From: Jiaxing Hu To: tomeu@tomeuvizoso.net, heiko@sntech.de, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, ulfh@kernel.org, p.zabel@pengutronix.de, ogabbay@kernel.org, zhangqing@rock-chips.com Cc: royalnet026@gmail.com, abel.vesa@oss.qualcomm.com, sebastian.reichel@collabora.com, sidong.yang@furiosa.ai, u.kleine-koenig@baylibre.com, chaoyi.chen@rock-chips.com, shawn.lin@rock-chips.com, finley.xiao@rock-chips.com, diederik@cknow-tech.com, alchark@flipper.net, leonard@lausen.nl, jeff.hugo@oss.qualcomm.com, rfoss@kernel.org, dri-devel@lists.freedesktop.org, linux-rockchip@lists.infradead.org, iommu@lists.linux.dev, linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Jiaxing Hu Subject: [PATCH v16 02/16] accel/rocket: take the completion register writes under job_lock Date: Sun, 8 Nov 2026 19:59:03 +1300 Message-ID: <20261108065917.135194-3-gahing@gahingwoo.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261108065917.135194-1-gahing@gahingwoo.com> References: <20261108065917.135194-1-gahing@gahingwoo.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The IRQ handler writes OPERATION_ENABLE and INTERRUPT_CLEAR before it takes job_lock, while rocket_job_hw_submit() sets OPERATION_ENABLE to 1 under that lock. If the two run at the same time, the 0 written by the IRQ handler can overwrite the 1 written for a new task and stop a task that has just started. Move both writes into the existing scoped_guard(), so they are under the same lock as the submit. Fixes: 0810d5ad88a1 ("accel/rocket: Add job submission IOCTL") Signed-off-by: Jiaxing Hu Tested-by: Igor Paunovic # RK3588, three cores, induced reset, JOB_TIMEOUT_MS=2 Reviewed-by: Heiko Stuebner --- drivers/accel/rocket/rocket_job.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/accel/rocket/rocket_job.c b/drivers/accel/rocket/rocket_job.c index c3edb94355a3..03e5f094f60b 100644 --- a/drivers/accel/rocket/rocket_job.c +++ b/drivers/accel/rocket/rocket_job.c @@ -369,10 +369,15 @@ static void rocket_job_handle_irq(struct rocket_core *core) { pm_runtime_mark_last_busy(core->dev); - rocket_pc_writel(core, OPERATION_ENABLE, 0x0); - rocket_pc_writel(core, INTERRUPT_CLEAR, 0x1ffff); + scoped_guard(mutex, &core->job_lock) { + /* + * Stopping the block belongs under the lock. hw_submit() writes + * OPERATION_ENABLE too, and outside the lock this zero can land + * after that one and stop a task that has only just started. + */ + rocket_pc_writel(core, OPERATION_ENABLE, 0x0); + rocket_pc_writel(core, INTERRUPT_CLEAR, 0x1ffff); - scoped_guard(mutex, &core->job_lock) if (core->in_flight_job) { if (core->in_flight_job->next_task_idx < core->in_flight_job->task_count) { rocket_job_hw_submit(core, core->in_flight_job); @@ -384,6 +389,7 @@ static void rocket_job_handle_irq(struct rocket_core *core) pm_runtime_put_autosuspend(core->dev); core->in_flight_job = NULL; } + } } static void -- 2.43.0