Messages in this thread Patch in this message | | | From | Andrey Smirnov <> | Subject | [PATCH] xhci: Use ffs() to find page size in xhci_mem_init() | Date | Wed, 6 Feb 2019 16:03:49 -0800 |
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Get page size order using ffs() instead of open coding it with a loop.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com> Cc: Mathias Nyman <mathias.nyman@intel.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: linux-usb@vger.kernel.org Cc: linux-kernel@vger.kernel.org --- drivers/usb/host/xhci-mem.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-)
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c index 36a3eb8849f1..44b43c3d819f 100644 --- a/drivers/usb/host/xhci-mem.c +++ b/drivers/usb/host/xhci-mem.c @@ -2362,11 +2362,7 @@ 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); -- 2.20.1
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