Commit 81720ec5 authored by Linyu Yuan's avatar Linyu Yuan Committed by Greg Kroah-Hartman
Browse files

usb: host: xhci: use ffs() in xhci_mem_init() 



The for loop to find page size bit can be replaced with ffs().

Signed-off-by: default avatarLinyu Yuan <quic_linyyuan@quicinc.com>
Signed-off-by: default avatarMathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20220303110903.1662404-6-mathias.nyman@linux.intel.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 70c05e4c

drivers/usb/host/xhci-mem.c

+1 −5
Original line number Diff line number Diff line
@@ -2391,11 +2391,7 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags) 
	page_size = readl(&xhci->op_regs->page_size);

	xhci_dbg_trace(xhci, trace_xhci_dbg_init,

			"Supported page size register = 0x%x", page_size);

	for (i = 0; i < 16; i++) {

		if ((0x1 & page_size) != 0)

			break;

		page_size = page_size >> 1;

	}

	i = ffs(page_size);

	if (i < 16)

		xhci_dbg_trace(xhci, trace_xhci_dbg_init,

			"Supported page size of %iK", (1 << (i+12)) / 1024);