Re: [PATCH V3] usb: xhci: Add debugfs support for xHCI port bandwidth

[kernel test robot <lkp@intel.com>]

Hi raoxu,

kernel test robot noticed the following build warnings:

[auto build test WARNING on usb/usb-testing]
[also build test WARNING on usb/usb-next usb/usb-linus linus/master v6.14-rc5 next-20250305]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/raoxu/usb-xhci-Add-debugfs-support-for-xHCI-port-bandwidth/20250305-165606
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
patch link:    https://lore.kernel.org/r/20250305085118.28826-1-raoxu%40uniontech.com
patch subject: [PATCH V3] usb: xhci: Add debugfs support for xHCI port bandwidth
config: arc-randconfig-002-20250306 (https://download.01.org/0day-ci/archive/20250306/202503061205.wtVpmjvj-lkp@intel.com/config)
compiler: arceb-elf-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250306/202503061205.wtVpmjvj-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202503061205.wtVpmjvj-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/usb/host/xhci.c: In function 'xhci_get_port_bandwidth':
>> drivers/usb/host/xhci.c:3094:41: warning: variable 'num_ports' set but not used [-Wunused-but-set-variable]
    3094 |         unsigned int                    num_ports;
         |                                         ^~~~~~~~~


vim +/num_ports +3094 drivers/usb/host/xhci.c

  3090	
  3091	/* Get the available bandwidth of the ports under the xhci roothub */
  3092	int xhci_get_port_bandwidth(struct xhci_hcd *xhci, u8 dev_speed)
  3093	{
> 3094		unsigned int			num_ports;
  3095		int				ret;
  3096		unsigned long			flags;
  3097		struct xhci_container_ctx	*ctx;
  3098	
  3099		num_ports = HCS_MAX_PORTS(xhci->hcs_params1);
  3100		ctx = xhci->get_bw_command->in_ctx;
  3101	
  3102		/* get xhci hub port bandwidth */
  3103		/* refer to xhci rev1_2 protocol 4.6.15*/
  3104		spin_lock_irqsave(&xhci->lock, flags);
  3105		ret = xhci_queue_get_rh_port_bw(xhci, xhci->get_bw_command, ctx->dma,
  3106						dev_speed, 0, false);
  3107		if (ret < 0) {
  3108			spin_unlock_irqrestore(&xhci->lock, flags);
  3109			return ret;
  3110		}
  3111		xhci_ring_cmd_db(xhci);
  3112		spin_unlock_irqrestore(&xhci->lock, flags);
  3113	
  3114		wait_for_completion(xhci->get_bw_command->completion);
  3115	
  3116		return ret;
  3117	}
  3118	

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