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Thu, 04 Dec 2025 03:21:43 -0800 (PST) Message-ID: <27c926bf-f889-4e54-83c7-28134ca84899@gmail.com> Date: Thu, 4 Dec 2025 16:21:40 +0500 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] spi: cadence-qspi: Fix runtime PM imbalance in probe To: Andy Shevchenko Cc: broonie@kernel.org, linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, khairul.anuar.romli@altera.com, adrianhoyin.ng@altera.com, nirav.rabara@altera.com, matthew.gerlach@altera.com References: <20251130091251.12120-1-alitariq45892@gmail.com> Content-Language: en-US From: Ali Tariq In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Thanks for the merge. Recently, there was a patch which removed the redundant pm_runtime_mark_last_busy() call: https://lore.kernel.org/linux-kernel/20251203181921.97171-1-akifejaz40@gmail.com/ The patch removes pm_runtime_mark_last_busy() from the probe function, as pm_runtime_put_autosuspend() already handles this internally. Best Regards, Ali On 12/3/25 1:50 AM, Andy Shevchenko wrote: > On Sun, Nov 30, 2025 at 09:12:51AM +0000, Ali Tariq wrote: >> The probe function incorrectly calls pm_runtime_put_autosuspend() >> twice in succession at the end of successful probe, dropping two >> runtime PM references while only one was acquired earlier with >> pm_runtime_get_sync(). This causes a usage count underflow: >> >> cadence-qspi 13010000.spi: Runtime PM usage count underflow! >> >> Remove the first redundant pm_runtime_put_autosuspend() call to >> balance the reference count. >> >> Tested on StarFive VisionFive 2 v1.2A board. > > ... > >> if (!(ddata && (ddata->quirks & CQSPI_DISABLE_RUNTIME_PM))) { >> - pm_runtime_put_autosuspend(dev); >> pm_runtime_mark_last_busy(dev); > > This one — pm_runtime_mark_last_busy() — also may be removed as it's integrated > into the _put_auutosuspend(). > >> pm_runtime_put_autosuspend(dev); >> } >