linux-kernel - [PATCH] gpu: drm: nouveau: nvkm: nv40: Replace mdelay() with msleep() in nv40_sensor

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Message-Id: <20180804002845.18557-1-baijiaju1990@gmail.com>
Date:   Sat,  4 Aug 2018 08:28:45 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     bskeggs@...hat.com, airlied@...ux.ie
Cc:     dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, Jia-Ju Bai <baijiaju1990@...il.com>
Subject: [PATCH] gpu: drm: nouveau: nvkm: nv40: Replace mdelay() with msleep() in nv40_sensor_setup()

nv40_sensor_setup() is never called in atomic context.
It calls mdelay() to busily wait, which is not necessary.
mdelay() can be replaced with msleep().

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

Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>
---
 drivers/gpu/drm/nouveau/nvkm/subdev/therm/nv40.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/nv40.c b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/nv40.c
index 2c92ffb5f9d0..36c4b8865083 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/nv40.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/nv40.c
@@ -59,11 +59,11 @@ nv40_sensor_setup(struct nvkm_therm *therm)
 	if (style == NEW_STYLE) {
 		nvkm_mask(device, 0x15b8, 0x80000000, 0);
 		nvkm_wr32(device, 0x15b0, 0x80003fff);
-		mdelay(20); /* wait for the temperature to stabilize */
+		msleep(20); /* wait for the temperature to stabilize */
 		return nvkm_rd32(device, 0x15b4) & 0x3fff;
 	} else if (style == OLD_STYLE) {
 		nvkm_wr32(device, 0x15b0, 0xff);
-		mdelay(20); /* wait for the temperature to stabilize */
+		msleep(20); /* wait for the temperature to stabilize */
 		return nvkm_rd32(device, 0x15b4) & 0xff;
 	} else
 		return -ENODEV;
-- 
2.17.0