[PATCH] usb: core: Remove unnecessary memset()

From: Suwan Kim
Date: Tue Dec 04 2018 - 09:31:53 EST


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@xxxxxxxxx>
---
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