From patchwork Fri May 31 08:53:22 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Marek Vasut X-Patchwork-Id: 13681323 X-Patchwork-Delegate: herbert@gondor.apana.org.au Received: from phobos.denx.de (phobos.denx.de [85.214.62.61]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A3B23155A53 for ; Fri, 31 May 2024 08:54:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=85.214.62.61 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717145693; cv=none; b=W82n76BTrmFpg9kSsBJgsZl2taX/EdOhkqtxrME4k8xrHAnLJTIk410+uKILriZB9873hQM+D7w2OnzAz1vzwQplvbzIXpkJjNnWLYE6xFgbUFzJvsq/+pIFEd2U2M+7y53xba8z4uwKq8+kZHaLH+FLuKQcQ4TvLYAAq2oDlWo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717145693; c=relaxed/simple; bh=QdZESmhfftlpEVQahcIpjh8FCP+VbYIkQ0nBIND/vjQ=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=S3i4Sri3juSTBB4wO+daK3zgdzGL6R5o4N1suMI81n2+FU90GWnCuIubH/hxK3RTCzoXGGRfVFRgQ82rNijwoNni2HKIKI1Cj1ViwrROZeBVN4HRJleTyYJg+diFSbfGQm7tlZm6yN3LDSGk0ezXS4pqQbWj53A6dfhfJ9ywwUs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=denx.de; spf=pass smtp.mailfrom=denx.de; dkim=pass (2048-bit key) header.d=denx.de header.i=@denx.de header.b=puqYrpH/; arc=none smtp.client-ip=85.214.62.61 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=denx.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=denx.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=denx.de header.i=@denx.de header.b="puqYrpH/" Received: from tr.lan (ip-86-49-120-218.bb.vodafone.cz [86.49.120.218]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: marex@denx.de) by phobos.denx.de (Postfix) with ESMTPSA id 0854088246; Fri, 31 May 2024 10:54:42 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=denx.de; s=phobos-20191101; t=1717145684; bh=ywmgWnjL30EYt/MuxhcwoOkfzGrfhbBZytmaTjE4Urk=; h=From:To:Cc:Subject:Date:From; b=puqYrpH/xjOIMgIMVamSDiZta2T3W48g2YC3oYqo/lcXAHkyOYsW1hOvZ44AZYXUa ubDkL58J1in5SR8mo3W+oc0QDdMc3WiBR1ArQqUTZ4RblKrjThPVZxZSml/RmFFk3S tMDtP4vtRtlu1K6ZnD/zmDMzQlxiIvFpwzbnNevQaEgxmvJofiwjEHWqDRprUs7kSQ nrgDHGiBLo5qWtxWfbGav8HboIT3QcR70+qCQeS+dXpVoObx+S/sMo293Mk5c+ao/1 SpViP2OMIhngjNPvu4lfVDi/hhoF2ZiIU3i7zhY4ggKh1ZaFsXGgRmdhWJxcMVlvTB MvkzgZc/sFYsA== From: Marek Vasut To: linux-crypto@vger.kernel.org Cc: Marek Vasut , Gatien Chevallier , =?utf-8?q?Uwe_Kleine-K?= =?utf-8?q?=C3=B6nig?= , Alexandre Torgue , Herbert Xu , Maxime Coquelin , Olivia Mackall , Rob Herring , Yang Yingliang , kernel@dh-electronics.com, linux-arm-kernel@lists.infradead.org, linux-stm32@st-md-mailman.stormreply.com Subject: [PATCH v3 1/2] hwrng: stm32 - use pm_runtime_resume_and_get() Date: Fri, 31 May 2024 10:53:22 +0200 Message-ID: <20240531085414.42529-1-marex@denx.de> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Virus-Scanned: clamav-milter 0.103.8 at phobos.denx.de X-Virus-Status: Clean include/linux/pm_runtime.h pm_runtime_get_sync() description suggests to ... consider using pm_runtime_resume_and_get() instead of it, especially if its return value is checked by the caller, as this is likely to result in cleaner code. This is indeed better, switch to pm_runtime_resume_and_get() which correctly suspends the device again in case of failure. Also add error checking into the RNG driver in case pm_runtime_resume_and_get() does fail, which is currently not done, and it does detect sporadic -EACCES error return after resume, which would otherwise lead to a hang due to register access on un-resumed hardware. Now the read simply errors out and the system does not hang. Acked-by: Gatien Chevallier Signed-off-by: Marek Vasut --- Cc: "Uwe Kleine-König" Cc: Alexandre Torgue Cc: Gatien Chevallier Cc: Herbert Xu Cc: Marek Vasut Cc: Maxime Coquelin Cc: Olivia Mackall Cc: Rob Herring Cc: Yang Yingliang Cc: kernel@dh-electronics.com Cc: linux-arm-kernel@lists.infradead.org Cc: linux-crypto@vger.kernel.org Cc: linux-stm32@st-md-mailman.stormreply.com --- V2: Add AB from Gatien V3: No change --- drivers/char/hw_random/stm32-rng.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/char/hw_random/stm32-rng.c b/drivers/char/hw_random/stm32-rng.c index 0e903d6e22e30..6dec4adc49853 100644 --- a/drivers/char/hw_random/stm32-rng.c +++ b/drivers/char/hw_random/stm32-rng.c @@ -187,7 +187,9 @@ static int stm32_rng_read(struct hwrng *rng, void *data, size_t max, bool wait) int retval = 0, err = 0; u32 sr; - pm_runtime_get_sync((struct device *) priv->rng.priv); + retval = pm_runtime_resume_and_get((struct device *)priv->rng.priv); + if (retval) + return retval; if (readl_relaxed(priv->base + RNG_SR) & RNG_SR_SEIS) stm32_rng_conceal_seed_error(rng); From patchwork Fri May 31 08:53:23 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Marek Vasut X-Patchwork-Id: 13681324 X-Patchwork-Delegate: herbert@gondor.apana.org.au Received: from phobos.denx.de (phobos.denx.de [85.214.62.61]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5FA8F156223 for ; Fri, 31 May 2024 08:54:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=85.214.62.61 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717145697; cv=none; b=E7shjLTHyIFo1Mwng8dvSuZdwyulHyFuWv3FqgGVX3aLwzgUeKfsUvblUZWFHsJXQgBsbvw4oHskM2nLOC/0AL+Sgi3rCn1B3mAlj8qoDzxcj6oPl9DU2/pJWYSxz/9ALssriP26Ab33rC4sxxf4M8XS7BF5Jkva2z8+uhNGiTw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717145697; c=relaxed/simple; bh=FvWiSWloULpeiEXwqmSDug9NYhmsfm9uMUsPShqtYnk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=D+CUgnEoigfrAEdZTMeRF2xDP4FOAS7HsSTt01fZKJGjbYxx/UZh31jP3J8py8f1mwADChP5A/sIEi/SqyqJYQpAivwuzVbl7BkNYbgIFNCqjR3pPmuI2dTgVg1xFJbIBpRkBUbKsO4Efsp9bNJktSQy+StlnmOO35Kr2RPU2Mc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=denx.de; spf=pass smtp.mailfrom=denx.de; dkim=pass (2048-bit key) header.d=denx.de header.i=@denx.de header.b=Fb3mfbsO; arc=none smtp.client-ip=85.214.62.61 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=denx.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=denx.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=denx.de header.i=@denx.de header.b="Fb3mfbsO" Received: from tr.lan (ip-86-49-120-218.bb.vodafone.cz [86.49.120.218]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: marex@denx.de) by phobos.denx.de (Postfix) with ESMTPSA id AECD988263; Fri, 31 May 2024 10:54:46 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=denx.de; s=phobos-20191101; t=1717145687; bh=8yOYBaCe/V26K+yH063YYpC/biUYto47iMxo4kdQNrI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Fb3mfbsO9kOL6NL4Y4OJdg8R8B+erBk4av90GLHDauxSNcmtknYabd9mJR2MvYa7C BqdY1Bmmp0p37f/dRAhrxperQ6TJXvB5EcqKVIvUjNbYwUaYrTwnE3Luh7V+ASMbOY Zvdg776/x+Oao6vmVLZR2fwH6AGRyWP5eBUTWso09vce/6Bos3HjbSJ1RDZREheeNd wAOFrlRcIVi1LsxWDk0wLv37JUviRuR7OWwtNDojzBs8XLXezCe4Owimh77qLM3yn1 rhbGtefDq3chdWh10SYGV6Pntpa8mh363pCXJNbFnWAeNoeFjcBPEMnF8POWeQex/P NzVhq1nfb8Dcw== From: Marek Vasut To: linux-crypto@vger.kernel.org Cc: Marek Vasut , Gatien Chevallier , =?utf-8?q?Uwe_Kleine-K?= =?utf-8?q?=C3=B6nig?= , Alexandre Torgue , Herbert Xu , Maxime Coquelin , Olivia Mackall , Rob Herring , Yang Yingliang , kernel@dh-electronics.com, linux-arm-kernel@lists.infradead.org, linux-stm32@st-md-mailman.stormreply.com Subject: [PATCH v3 2/2] hwrng: stm32 - cache device pointer in struct stm32_rng_private Date: Fri, 31 May 2024 10:53:23 +0200 Message-ID: <20240531085414.42529-2-marex@denx.de> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240531085414.42529-1-marex@denx.de> References: <20240531085414.42529-1-marex@denx.de> Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Virus-Scanned: clamav-milter 0.103.8 at phobos.denx.de X-Virus-Status: Clean Place device pointer in struct stm32_rng_private and use it all over the place to get rid of the horrible type casts throughout the driver. No functional change. Acked-by: Gatien Chevallier Signed-off-by: Marek Vasut --- Cc: "Uwe Kleine-König" Cc: Alexandre Torgue Cc: Gatien Chevallier Cc: Herbert Xu Cc: Marek Vasut Cc: Maxime Coquelin Cc: Olivia Mackall Cc: Rob Herring Cc: Yang Yingliang Cc: kernel@dh-electronics.com Cc: linux-arm-kernel@lists.infradead.org Cc: linux-crypto@vger.kernel.org Cc: linux-stm32@st-md-mailman.stormreply.com --- V2: Fix up dev_err newlines Add AB from Gatien V3: Drop rng.priv assignment --- drivers/char/hw_random/stm32-rng.c | 31 +++++++++++++----------------- 1 file changed, 13 insertions(+), 18 deletions(-) diff --git a/drivers/char/hw_random/stm32-rng.c b/drivers/char/hw_random/stm32-rng.c index 6dec4adc49853..d08c870eb8d1f 100644 --- a/drivers/char/hw_random/stm32-rng.c +++ b/drivers/char/hw_random/stm32-rng.c @@ -70,6 +70,7 @@ struct stm32_rng_config { struct stm32_rng_private { struct hwrng rng; + struct device *dev; void __iomem *base; struct clk *clk; struct reset_control *rst; @@ -99,7 +100,7 @@ struct stm32_rng_private { */ static int stm32_rng_conceal_seed_error_cond_reset(struct stm32_rng_private *priv) { - struct device *dev = (struct device *)priv->rng.priv; + struct device *dev = priv->dev; u32 sr = readl_relaxed(priv->base + RNG_SR); u32 cr = readl_relaxed(priv->base + RNG_CR); int err; @@ -171,7 +172,7 @@ static int stm32_rng_conceal_seed_error(struct hwrng *rng) { struct stm32_rng_private *priv = container_of(rng, struct stm32_rng_private, rng); - dev_dbg((struct device *)priv->rng.priv, "Concealing seed error\n"); + dev_dbg(priv->dev, "Concealing seed error\n"); if (priv->data->has_cond_reset) return stm32_rng_conceal_seed_error_cond_reset(priv); @@ -187,7 +188,7 @@ static int stm32_rng_read(struct hwrng *rng, void *data, size_t max, bool wait) int retval = 0, err = 0; u32 sr; - retval = pm_runtime_resume_and_get((struct device *)priv->rng.priv); + retval = pm_runtime_resume_and_get(priv->dev); if (retval) return retval; @@ -206,8 +207,7 @@ static int stm32_rng_read(struct hwrng *rng, void *data, size_t max, bool wait) sr, sr, 10, 50000); if (err) { - dev_err((struct device *)priv->rng.priv, - "%s: timeout %x!\n", __func__, sr); + dev_err(priv->dev, "%s: timeout %x!\n", __func__, sr); break; } } else if (!sr) { @@ -220,8 +220,7 @@ static int stm32_rng_read(struct hwrng *rng, void *data, size_t max, bool wait) err = stm32_rng_conceal_seed_error(rng); i++; if (err && i > RNG_NB_RECOVER_TRIES) { - dev_err((struct device *)priv->rng.priv, - "Couldn't recover from seed error\n"); + dev_err(priv->dev, "Couldn't recover from seed error\n"); retval = -ENOTRECOVERABLE; goto exit_rpm; } @@ -239,8 +238,7 @@ static int stm32_rng_read(struct hwrng *rng, void *data, size_t max, bool wait) err = stm32_rng_conceal_seed_error(rng); i++; if (err && i > RNG_NB_RECOVER_TRIES) { - dev_err((struct device *)priv->rng.priv, - "Couldn't recover from seed error"); + dev_err(priv->dev, "Couldn't recover from seed error"); retval = -ENOTRECOVERABLE; goto exit_rpm; } @@ -255,8 +253,8 @@ static int stm32_rng_read(struct hwrng *rng, void *data, size_t max, bool wait) } exit_rpm: - pm_runtime_mark_last_busy((struct device *) priv->rng.priv); - pm_runtime_put_sync_autosuspend((struct device *) priv->rng.priv); + pm_runtime_mark_last_busy(priv->dev); + pm_runtime_put_sync_autosuspend(priv->dev); return retval || !wait ? retval : -EIO; } @@ -331,8 +329,7 @@ static int stm32_rng_init(struct hwrng *rng) 10, 50000); if (err) { clk_disable_unprepare(priv->clk); - dev_err((struct device *)priv->rng.priv, - "%s: timeout %x!\n", __func__, reg); + dev_err(priv->dev, "%s: timeout %x!\n", __func__, reg); return -EINVAL; } } else { @@ -360,8 +357,7 @@ static int stm32_rng_init(struct hwrng *rng) 10, 100000); if (err || (reg & ~RNG_SR_DRDY)) { clk_disable_unprepare(priv->clk); - dev_err((struct device *)priv->rng.priv, - "%s: timeout:%x SR: %x!\n", __func__, err, reg); + dev_err(priv->dev, "%s: timeout:%x SR: %x!\n", __func__, err, reg); return -EINVAL; } @@ -467,8 +463,7 @@ static int __maybe_unused stm32_rng_resume(struct device *dev) if (err) { clk_disable_unprepare(priv->clk); - dev_err((struct device *)priv->rng.priv, - "%s: timeout:%x CR: %x!\n", __func__, err, reg); + dev_err(priv->dev, "%s: timeout:%x CR: %x!\n", __func__, err, reg); return -EINVAL; } } else { @@ -543,6 +538,7 @@ static int stm32_rng_probe(struct platform_device *ofdev) priv->ced = of_property_read_bool(np, "clock-error-detect"); priv->lock_conf = of_property_read_bool(np, "st,rng-lock-conf"); + priv->dev = dev; priv->data = of_device_get_match_data(dev); if (!priv->data) @@ -553,7 +549,6 @@ static int stm32_rng_probe(struct platform_device *ofdev) priv->rng.name = dev_driver_string(dev); priv->rng.init = stm32_rng_init; priv->rng.read = stm32_rng_read; - priv->rng.priv = (unsigned long) dev; priv->rng.quality = 900; pm_runtime_set_autosuspend_delay(dev, 100);