2018-04-10 07:41:25

by Jia-Ju Bai

[permalink] [raw]
Subject: [PATCH 2/2] usb: isp1760: Replace mdelay with msleep in isp1760_stop

isp1760_stop() is never called in atomic context.

The call chain ending up at isp1760_stop() is:
[1] isp1760_stop() <- isp1760_shutdown()

isp1760_shutdown() is set as ".shutdown" in struct hc_driver.
isp1760_stop() is also set as ".stop" in hc_driver.
These functions are not called in atomic context.

Despite never getting called from atomic context, isp1760_stop()
calls mdelay() to busily wait.
This is not necessary and can be replaced with msleep() to
avoid busy waiting.

This is found by a static analysis tool named DCNS written by myself.
And I also manually check it

Signed-off-by: Jia-Ju Bai <[email protected]>
---
drivers/usb/isp1760/isp1760-hcd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/isp1760/isp1760-hcd.c b/drivers/usb/isp1760/isp1760-hcd.c
index 8e59e0c..5599310 100644
--- a/drivers/usb/isp1760/isp1760-hcd.c
+++ b/drivers/usb/isp1760/isp1760-hcd.c
@@ -2090,7 +2090,7 @@ static void isp1760_stop(struct usb_hcd *hcd)

isp1760_hub_control(hcd, ClearPortFeature, USB_PORT_FEAT_POWER, 1,
NULL, 0);
- mdelay(20);
+ msleep(20);

spin_lock_irq(&priv->lock);
ehci_reset(hcd);
--
1.9.1