drivers/platform/surface/surface_dtx.c:530:24: sparse: sparse: incorrect type in return expression (different base types)

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   c06a2ba62fc401b7aaefd23f5d0bc06d2457ccc1
commit: 1d609992832e900378b305f9f8dcf0ce8473049e platform/surface: Add DTX driver
date:   8 weeks ago
config: i386-randconfig-s032-20210513 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.3-341-g8af24329-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1d609992832e900378b305f9f8dcf0ce8473049e
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 1d609992832e900378b305f9f8dcf0ce8473049e
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' W=1 ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>


iwyu warnings: (new ones prefixed by >>)


vim +530 drivers/platform/surface/surface_dtx.c

   523	
   524	static __poll_t surface_dtx_poll(struct file *file, struct poll_table_struct *pt)
   525	{
   526		struct sdtx_client *client = file->private_data;
   527		__poll_t events = 0;
   528	
   529		if (down_read_killable(&client->ddev->lock))
 > 530			return -ERESTARTSYS;
   531	
   532		if (test_bit(SDTX_DEVICE_SHUTDOWN_BIT, &client->ddev->flags)) {
   533			up_read(&client->ddev->lock);
   534			return EPOLLHUP | EPOLLERR;
   535		}
   536	
   537		poll_wait(file, &client->ddev->waitq, pt);
   538	
   539		if (!kfifo_is_empty(&client->buffer))
   540			events |= EPOLLIN | EPOLLRDNORM;
   541	
   542		up_read(&client->ddev->lock);
   543		return events;
   544	}
   545	

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Attachment: .config.gz
Description: application/gzip