From 6c93c63a634ae7036d699a1e7f2121a9f2dee5fe Mon Sep 17 00:00:00 2001 From: Jia-Ju Bai Date: Tue, 10 Apr 2018 20:25:09 +0800 Subject: [PATCH] staging: rtl8192u: Replace mdelay with usleep_range in rtl8192_usb_disconnect rtl8192_usb_disconnect() is never called in atomic context. rtl8192_usb_disconnect() is only set as ".disconnect" in struct usb_driver. Despite never getting called from atomic context, rtl8192_usb_disconnect() calls mdelay() to busily wait. This is not necessary and can be replaced with usleep_range() 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 Signed-off-by: Greg Kroah-Hartman --- drivers/staging/rtl8192u/r8192U_core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/staging/rtl8192u/r8192U_core.c b/drivers/staging/rtl8192u/r8192U_core.c index d607c59..532a713 100644 --- a/drivers/staging/rtl8192u/r8192U_core.c +++ b/drivers/staging/rtl8192u/r8192U_core.c @@ -5035,7 +5035,7 @@ static void rtl8192_usb_disconnect(struct usb_interface *intf) kfree(priv->pFirmware); priv->pFirmware = NULL; rtl8192_usb_deleteendpoints(dev); - mdelay(10); + usleep_range(10000, 11000); } free_ieee80211(dev); RT_TRACE(COMP_DOWN, "wlan driver removed\n"); -- 2.7.4