linux-kernel - [PATCH] base: power: domain: Replace mdelay with msleep

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Date:   Fri, 26 Jan 2018 16:38:19 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     rjw@...ysocki.net, khilman@...nel.org, ulf.hansson@...aro.org,
        len.brown@...el.com, pavel@....cz, gregkh@...uxfoundation.org
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jia-Ju Bai <baijiaju1990@...il.com>
Subject: [PATCH] base: power: domain: Replace mdelay with msleep

After checking all possible call chains to genpd_dev_pm_detach() and
genpd_dev_pm_attach() here,
my tool finds that these functions are never called in atomic context,
namely never in an interrupt handler or holding a spinlock.
Thus mdelay can be replaced with msleep to avoid busy wait.

This is found by a static analysis tool named DCNS written by myself.

Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>
---
 drivers/base/power/domain.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 0c80bea..f84ac72 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -2144,7 +2144,7 @@ static void genpd_dev_pm_detach(struct device *dev, bool power_off)
 		if (ret != -EAGAIN)
 			break;
 
-		mdelay(i);
+		msleep(i);
 		cond_resched();
 	}
 
@@ -2231,7 +2231,7 @@ int genpd_dev_pm_attach(struct device *dev)
 		if (ret != -EAGAIN)
 			break;
 
-		mdelay(i);
+		msleep(i);
 		cond_resched();
 	}
 	mutex_unlock(&gpd_list_lock);
-- 
1.7.9.5