linux-kernel - [RFC v2 4/6] PM / Domains: succeed & warn when attaching non-irqsafe devices to an irq-safe domain.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1444141665-18534-5-git-send-email-mtitinger+renesas@baylibre.com>
Date:	Tue,  6 Oct 2015 16:27:43 +0200
From:	Marc Titinger <mtitinger@...libre.com>
To:	khilman@...nel.org, rjw@...ysocki.net
Cc:	lina.iyer@...aro.org, ahaslam@...libre.com, bcousson@...libre.com,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Marc Titinger <mtitinger@...libre.com>
Subject: [RFC v2 4/6] PM / Domains: succeed & warn when attaching non-irqsafe devices to an irq-safe domain.

From: Marc Titinger <mtitinger@...libre.com>

This patch checks for irq-safe compatibility in suspend/resume instead of
failing the attach operation early on. Non-cpu devices attaching to an
irq-safe power domain will have to call pm_runtime_irq_safe from their
probe function.

Signed-off-by: Marc Titinger <mtitinger@...libre.com>
---
 drivers/base/power/domain.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 1ca28a2..ebf1299 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -635,6 +635,14 @@ static int pm_genpd_runtime_resume(struct device *dev)
 		goto out;
 	}
 
+	/* The device probe may have missed calling pm_runtime_irq_safe.
+	 */
+	if (!dev->power.irq_safe && genpd->irq_safe) {
+		dev_err(dev, "trying to %s a non-irqsafe device in an irq-safe domain\n",
+		__func__);
+		return -EINVAL;
+	}
+
 	genpd_lock(genpd);
 	ret = __pm_genpd_poweron(genpd);
 	genpd_unlock(genpd);
@@ -1376,12 +1384,11 @@ int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
 	if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev))
 		return -EINVAL;
 
-	if (genpd->irq_safe && !dev->power.irq_safe) {
-		dev_err(dev,
-			"PM Domain %s is IRQ safe; device has to IRQ safe.\n",
-			genpd->name);
-		return -EINVAL;
-	}
+	/* Only issue a warning, runtime_irqsafe may be called later on
+	 * from the driver probe. */
+	if (genpd->irq_safe && !dev->power.irq_safe)
+		dev_warn(dev,
+		"Devices in an IRQ safe domain have to be IRQ safe.\n");
 
 	gpd_data = genpd_alloc_dev_data(dev, genpd, td);
 	if (IS_ERR(gpd_data))
-- 
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/