From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 EBEF21FE471; Tue, 25 Mar 2025 07:57:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742889452; cv=none; b=fmDr33+YUFsSjZlb8X3XZFOcvQxhL9BMPyMgZXZbgDfC2EGNPmowoc6pEIZiHbxwoHI1so6qxyfI72yoYCPOAXTJNjR9nvY7kPuRxolewe5QgjKwBJlkPb2ns+bkoTsUfX8tav74fsjhYyLz/BIJ5sulFl+Qgfxltge4YEXSPAw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742889452; c=relaxed/simple; bh=HXxzrKcaY6Po4D2vX685AUuFoG19pTyegFBuG5h8HLA=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=NNCH2Nsw0uZXywpisWebrtTQlqJ2wIg4ca8M8/g1vWs+ongG2RUgyF8bfCl8Ums6ijt1Gt+asnFYIkUX3BNtfIIhH5c8hj+66Lg66aV8oIaLyvd7xXDeaI6kIl/6HGO+6HpOOHGWAd5CTJ1MxYjtrhclvEtk0pnt8DOZrmHeAWg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=lFxdI4K+; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="lFxdI4K+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 214CBC4CEE4; Tue, 25 Mar 2025 07:57:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1742889451; bh=HXxzrKcaY6Po4D2vX685AUuFoG19pTyegFBuG5h8HLA=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=lFxdI4K+rw5hXYLFbKiyOdJvQ+FeyL9DV5K3+xr84A0vE+mKgFZZ48lxRdelD2J0+ KImiarlFzdfvQLC7JtUss7xS275JTJ0oVFNpveK4HVDWJohPxBwIQHWLhhPX6QKR5t 3mU+Tf3182mta+ZzstuctOPSEWiZyEkmK9/FoB1uTkxtERrsN/v7PdTxyqj1RJ+TCW bL1oerr3r1CBIeEGVrKa2sjCo1M9isH0Zkt0bJWIoCd5wyms3n+xg/SJ5XYNwsxXEo o2UYkZTGygUmmwQfQFL7+jgPE7OBw3fHU3uJF0UbkKWkUZ7l+x2YOu+52V9Pvo2vbG ffJSOFk2TYuKQ== Message-ID: Date: Tue, 25 Mar 2025 08:57:25 +0100 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 v2 2/2] firmware: exynos-acpm: allow use during system shutdown To: =?UTF-8?Q?Andr=C3=A9_Draszik?= , Tudor Ambarus , Alim Akhtar Cc: Peter Griffin , Will McVicker , kernel-team@android.com, linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org References: <20250324-acpm-atomic-v2-0-7d87746e1765@linaro.org> <20250324-acpm-atomic-v2-2-7d87746e1765@linaro.org> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit On 24/03/2025 16:34, André Draszik wrote: > +static bool acpm_may_sleep(void) > +{ > + return system_state <= SYSTEM_RUNNING || > + (IS_ENABLED(CONFIG_PREEMPT_COUNT) ? preemptible() : !irqs_disabled()); > +} > + > /** > * acpm_dequeue_by_polling() - RX dequeue by polling. > * @achan: ACPM channel info. > @@ -300,7 +314,10 @@ static int acpm_dequeue_by_polling(struct acpm_chan *achan, > return 0; > > /* Determined experimentally. */ > - usleep_range(20, 30); > + if (!acpm_may_sleep()) > + udelay(10); > + else ... and what do you do if IRQs get disabled exactly in this moment? This is just racy. You cannot check for a condition and assume it will be valid for whatever time you want it to be valid. What happens if system_state is changed to shutdown in this particular moment? How did you prevent this from happening? > + usleep_range(20, 30); > } while (ktime_before(ktime_get(), timeout)); > > dev_err(dev, "Timeout! ch:%u s:%u bitmap:%lx.\n", > Best regards, Krzysztof