[PATCH 1/2] mailbox: Add power_get/power_put API to mbox_chan_ops

[kernel test robot]

Hi Jason-JH.Lin,

kernel test robot noticed the following build warnings:

[auto build test WARNING on linus/master]
[also build test WARNING on fujitsu-integration/mailbox-for-next v6.10-rc3 next-20240613]
[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/Jason-JH-Lin/mailbox-Add-power_get-power_put-API-to-mbox_chan_ops/20240614-120412
base:   linus/master
patch link:    https://lore.kernel.org/r/20240614040133.24967-2-jason-jh.lin%40mediatek.com
patch subject: [PATCH 1/2] mailbox: Add power_get/power_put API to mbox_chan_ops
config: i386-randconfig-062-20240614 (https://download.01.org/0day-ci/archive/20240615/202406150214.pVxsbllC-lkp@intel.com/config)
compiler: gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240615/202406150214.pVxsbllC-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202406150214.pVxsbllC-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/mailbox/mailbox.c:382:39: sparse: sparse: incorrect type in return expression (different base types) @@     expected int @@     got void * @@
   drivers/mailbox/mailbox.c:382:39: sparse:     expected int
   drivers/mailbox/mailbox.c:382:39: sparse:     got void *
   drivers/mailbox/mailbox.c: note: in included file (through include/linux/smp.h, include/linux/alloc_tag.h, include/linux/percpu.h, ...):
   include/linux/list.h:83:21: sparse: sparse: self-comparison always evaluates to true

vim +382 drivers/mailbox/mailbox.c

   355	
   356	static int __mbox_bind_client(struct mbox_chan *chan, struct mbox_client *cl)
   357	{
   358		struct device *dev = cl->dev;
   359		unsigned long flags;
   360		int ret;
   361	
   362		if (chan->cl || !try_module_get(chan->mbox->dev->driver->owner)) {
   363			dev_dbg(dev, "%s: mailbox not free\n", __func__);
   364			return -EBUSY;
   365		}
   366	
   367		spin_lock_irqsave(&chan->lock, flags);
   368		chan->msg_free = 0;
   369		chan->msg_count = 0;
   370		chan->active_req = NULL;
   371		chan->cl = cl;
   372		init_completion(&chan->tx_complete);
   373	
   374		if (chan->txdone_method	== TXDONE_BY_POLL && cl->knows_txdone)
   375			chan->txdone_method = TXDONE_BY_ACK;
   376	
   377		spin_unlock_irqrestore(&chan->lock, flags);
   378	
   379		if (chan->mbox->ops->power_get) {
   380			ret = chan->mbox->ops->power_get(chan);
   381			if (ret < 0)
 > 382				return ERR_PTR(ret);
   383		}
   384	
   385		if (chan->mbox->ops->startup) {
   386			ret = chan->mbox->ops->startup(chan);
   387	
   388			if (ret) {
   389				dev_err(dev, "Unable to startup the chan (%d)\n", ret);
   390				mbox_free_channel(chan);
   391				return ret;
   392			}
   393		}
   394	
   395		return 0;
   396	}
   397	

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