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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 <baijiaju1990@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jia-Ju Bai 2018-04-10 15:37:06 +08:00 committed by Greg Kroah-Hartman
parent 0f0290089a
commit de0611b27d
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/isp1760/isp1760-hcd.c
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@ -2093,7 +2093,7 @@ 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);