[PATCH 4/4] nvme: wire up async polling for io passthrough commands

[kernel test robot]

Hi Kanchan,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on axboe-block/for-next]
[also build test WARNING on linus/master next-20220805]
[cannot apply to hch-configfs/for-next v5.19]
[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/Kanchan-Joshi/fs-add-file_operations-uring_cmd_iopoll/20220806-004320
base:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-next
config: ia64-randconfig-s032-20220807 (https://download.01.org/0day-ci/archive/20220807/202208072057.wTajgd76-lkp@intel.com/config)
compiler: ia64-linux-gcc (GCC) 12.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://github.com/intel-lab-lkp/linux/commit/0964795577fbf09d8b315269504b5e87b5ac492b
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Kanchan-Joshi/fs-add-file_operations-uring_cmd_iopoll/20220806-004320
        git checkout 0964795577fbf09d8b315269504b5e87b5ac492b
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=ia64 SHELL=/bin/bash drivers/nvme/host/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp at intel.com>

sparse warnings: (new ones prefixed by >>)
>> drivers/nvme/host/ioctl.c:639:37: sparse: sparse: Using plain integer as NULL pointer

vim +639 drivers/nvme/host/ioctl.c

   625	
   626	int nvme_ns_chr_uring_cmd_iopoll(struct io_uring_cmd *ioucmd)
   627	{
   628		struct bio *bio;
   629		int ret;
   630		struct nvme_ns *ns;
   631		struct request_queue *q;
   632	
   633		rcu_read_lock();
   634		bio = READ_ONCE(ioucmd->cookie);
   635		ns = container_of(file_inode(ioucmd->file)->i_cdev,
   636				struct nvme_ns, cdev);
   637		q = ns->queue;
   638		if (test_bit(QUEUE_FLAG_POLL, &q->queue_flags) && bio && bio->bi_bdev)
 > 639			ret = bio_poll(bio, 0, 0);
   640		rcu_read_unlock();
   641		return ret;
   642	}
   643	#ifdef CONFIG_NVME_MULTIPATH
   644	static int nvme_ns_head_ctrl_ioctl(struct nvme_ns *ns, unsigned int cmd,
   645			void __user *argp, struct nvme_ns_head *head, int srcu_idx)
   646		__releases(&head->srcu)
   647	{
   648		struct nvme_ctrl *ctrl = ns->ctrl;
   649		int ret;
   650	
   651		nvme_get_ctrl(ns->ctrl);
   652		srcu_read_unlock(&head->srcu, srcu_idx);
   653		ret = nvme_ctrl_ioctl(ns->ctrl, cmd, argp);
   654	
   655		nvme_put_ctrl(ctrl);
   656		return ret;
   657	}
   658	

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