From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4658837DAC0; Sun, 20 Sep 2026 18:59:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789930794; cv=none; b=lgaDyhnHcaH3qeTbKT1MsuqJyC1csl8EoHqFfghmwubiMnUrMcEpsahypc7xrfgLtDDPbtuPSlkMIndeNnxZv7WvcDG8hciN05WUD8MCAK8Di6NY2io4KI8xQooXSP0uAoWMFkG2LsK0UQze1Pkc32xh/EaaUwoHgYYcm2NfDsE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789930794; c=relaxed/simple; bh=qMWHZjLxqhY9fhITzXq2iTIWrq7ggazaRm8ACHyhfLA=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=h6LvwMc134U5FPl2hzdyo6l+GKr63Ix+W7Cj9rjj+dPyeJJsemTHfBTOuVWeWYA/Z0N9iFEIGwXdlCY/uYXXLrWc74cl9s9f0tP7V3o6E95qAPrVuT78gIthHHdW27Njr2lbnJUcPoOzHaCiksXy0vlEPY2X7HK7P64lF8rbkU8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=HQzTYhTy; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="HQzTYhTy" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9CF361F00893; Sun, 20 Sep 2026 18:59:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789930792; bh=coW3diTnqTBnN50KbcpCFaLjXH4KVm0QzchhB2rzIz4=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=HQzTYhTytuQ31HXsFDmvdFZM0ykQ/5Fg5fc9Za5pViMomZoK8pL0ibg7DCD1ijWPj yvjbbRokrFiuvidNwtbXg3/lDv8swiA86isf7wUi0AjeFaKnO/wBcp1+Nmhz3+nDrI G7uVdxnURxe9rk9whwnGFQ7dafBtomIosvW2VLhGvdN8zrCLuFKq9lOgzpx37gTKbf 5bXlw1hIRADsNfuTbf/zbzTBno1PpnEyLUSX6L2VdaJb81baOwc+ghBW7O6OdQ+eE0 G5Ev72Hr5vI5t6qsVzOLiTw+iSdXtrbgyPw+ceVgiP/Dztsu7IqnG/vST8WtOfxwS7 BNaRa5ZgASo2A== From: Linus Walleij Date: Sun, 20 Sep 2026 20:59:41 +0200 Subject: [PATCH v5 06/23] dmaengine: ste_dma40: Check runtime PM in IRQ Precedence: bulk X-Mailing-List: dmaengine@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260920-dma40-fixes-v5-6-5c55cd7f92f9@kernel.org> References: <20260920-dma40-fixes-v5-0-5c55cd7f92f9@kernel.org> In-Reply-To: <20260920-dma40-fixes-v5-0-5c55cd7f92f9@kernel.org> To: Vinod Koul , Frank Li Cc: dmaengine@vger.kernel.org, phone-devel@vger.kernel.org, Linus Walleij , sashiko-bot@kernel.org X-Mailer: b4 0.14.3 d40_handle_interrupt() reads DMA40 interrupt registers unconditionally. A spurious interrupt can arrive while the device is runtime suspended, after dma40_runtime_suspend() has disabled the GCC clock. Avoid touching the registers unless the device is runtime active by taking a conditional runtime PM reference. Return IRQ_NONE when the device is suspended, and drop the reference after handling an active interrupt. When CONFIG_PM is disabled, pm_runtime_get_if_active() returns -EINVAL even though the registers remain accessible. Keep handling interrupts in that configuration and only drop the runtime PM reference when one was acquired. Fixes: 7fb3e75e1833 ("dmaengine/ste_dma40: support pm in dma40") Reported-by: sashiko-bot@kernel.org Closes: https://lore.kernel.org/dmaengine/20260819225114.AE1511F000E9@smtp.kernel.org/ Assisted-by: LLM Signed-off-by: Linus Walleij --- drivers/dma/ste_dma40.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c index 1d02226ab5ff..58128a980847 100644 --- a/drivers/dma/ste_dma40.c +++ b/drivers/dma/ste_dma40.c @@ -1798,6 +1798,11 @@ static irqreturn_t d40_handle_interrupt(int irq, void *data) u32 *regs = base->regs_interrupt; struct d40_interrupt_lookup *il = base->gen_dmac.il; u32 il_size = base->gen_dmac.il_size; + int ret; + + ret = pm_runtime_get_if_active(base->dev); + if (IS_ENABLED(CONFIG_PM) && ret <= 0) + return IRQ_NONE; spin_lock(&base->interrupt_lock); @@ -1846,6 +1851,9 @@ static irqreturn_t d40_handle_interrupt(int irq, void *data) spin_unlock(&base->interrupt_lock); + if (ret > 0) + pm_runtime_put_autosuspend(base->dev); + return IRQ_HANDLED; } -- 2.55.0