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From:   Suwan Kim <suwan.kim027@gmail.com>
To:     gregkh@linuxfoundation.org
Cc:     stern@rowland.harvard.edu, linux-usb@vger.kernel.org,
        mathias.nyman@linux.intel.com, heikki.krogerus@linux.intel.com,
        linux-kernel@vger.kernel.org, balbi@kernel.org
Subject: [PATCH] usb: core: Remove unnecessary memset()
Date:   Tue,  4 Dec 2018 23:31:43 +0900
Message-Id: <20181204143143.8407-1-suwan.kim027@gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

register_root_hub() calls memset() setting usb_dev->bus->devmap.
devicemap to 0 during hcd probe function (usb_hcd_pci_probe). But
in previous function which is also the procedure of usb_hcd_pci_probe(),
usb_bus_init() already initialized bus->devmap calling memset().
Furthermore, register_root_hub() is called only once in kernel.
So, calling memset() which resets usb_bus->devmap.devicemap in
register_root_hub() is redundant.

Signed-off-by: Suwan Kim <suwan.kim027@gmail.com>
---
 drivers/usb/core/hcd.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 487025d31d44..015b126ce455 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -1074,8 +1074,6 @@ static int register_root_hub(struct usb_hcd *hcd)
 
 	usb_dev->devnum = devnum;
 	usb_dev->bus->devnum_next = devnum + 1;
-	memset (&usb_dev->bus->devmap.devicemap, 0,
-			sizeof usb_dev->bus->devmap.devicemap);
 	set_bit (devnum, usb_dev->bus->devmap.devicemap);
 	usb_set_device_state(usb_dev, USB_STATE_ADDRESS);
 
-- 
2.19.2