Hi Manivannan, I love your patch! Yet something to improve: [auto build test ERROR on staging/staging-testing] [also build test ERROR on linux/master linus/master v5.15-rc6] [cannot apply to char-misc/char-misc-testing next-20211021] [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] url: https://github.com/0day-ci/linux/commits/Manivannan-Sadhasivam/MHI-patche... base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git 502408a61f4b7eb4713f44bd77f4a48e6cb1b59a config: m68k-allmodconfig (attached as .config) compiler: m68k-linux-gcc (GCC) 11.2.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/0day-ci/linux/commit/f0be8fa21fa4e6ddc6998710bf912a648... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Manivannan-Sadhasivam/MHI-patches-for-v5-16/20211016-145939 git checkout f0be8fa21fa4e6ddc6998710bf912a6483a3c09d # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=m68k SHELL=/bin/bash drivers/net/wwan/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): drivers/net/wwan/mhi_wwan_mbim.c: In function 'mhi_mbim_probe': 612 | err = mhi_prepare_for_transfer(mhi_dev); | ^~~~~~~~~~~~~~~~~~~~~~~~ In file included from drivers/net/wwan/mhi_wwan_mbim.c:18: include/linux/mhi.h:728:5: note: declared here 728 | int mhi_prepare_for_transfer(struct mhi_device *mhi_dev, | ^~~~~~~~~~~~~~~~~~~~~~~~ vim +/mhi_prepare_for_transfer +612 drivers/net/wwan/mhi_wwan_mbim.c aa730a9905b7b0 Loic Poulain 2021-08-03 593 aa730a9905b7b0 Loic Poulain 2021-08-03 594 static int mhi_mbim_probe(struct mhi_device *mhi_dev, const struct mhi_device_id *id) aa730a9905b7b0 Loic Poulain 2021-08-03 595 { aa730a9905b7b0 Loic Poulain 2021-08-03 596 struct mhi_controller *cntrl = mhi_dev->mhi_cntrl; aa730a9905b7b0 Loic Poulain 2021-08-03 597 struct mhi_mbim_context *mbim; aa730a9905b7b0 Loic Poulain 2021-08-03 598 int err; aa730a9905b7b0 Loic Poulain 2021-08-03 599 aa730a9905b7b0 Loic Poulain 2021-08-03 600 mbim = devm_kzalloc(&mhi_dev->dev, sizeof(*mbim), GFP_KERNEL); aa730a9905b7b0 Loic Poulain 2021-08-03 601 if (!mbim) aa730a9905b7b0 Loic Poulain 2021-08-03 602 return -ENOMEM; aa730a9905b7b0 Loic Poulain 2021-08-03 603 94c0a6fbd5cfc3 Wei Yongjun 2021-08-08 604 spin_lock_init(&mbim->tx_lock); aa730a9905b7b0 Loic Poulain 2021-08-03 605 dev_set_drvdata(&mhi_dev->dev, mbim); aa730a9905b7b0 Loic Poulain 2021-08-03 606 mbim->mdev = mhi_dev; aa730a9905b7b0 Loic Poulain 2021-08-03 607 mbim->mru = mhi_dev->mhi_cntrl->mru ? mhi_dev->mhi_cntrl->mru : MHI_DEFAULT_MRU; aa730a9905b7b0 Loic Poulain 2021-08-03 608 aa730a9905b7b0 Loic Poulain 2021-08-03 609 INIT_DELAYED_WORK(&mbim->rx_refill, mhi_net_rx_refill_work); aa730a9905b7b0 Loic Poulain 2021-08-03 610 aa730a9905b7b0 Loic Poulain 2021-08-03 611 /* Start MHI channels */ 97c78d0af55fff Jakub Kicinski 2021-08-26 @612 err = mhi_prepare_for_transfer(mhi_dev); aa730a9905b7b0 Loic Poulain 2021-08-03 613 if (err) aa730a9905b7b0 Loic Poulain 2021-08-03 614 return err; aa730a9905b7b0 Loic Poulain 2021-08-03 615 aa730a9905b7b0 Loic Poulain 2021-08-03 616 /* Number of transfer descriptors determines size of the queue */ aa730a9905b7b0 Loic Poulain 2021-08-03 617 mbim->rx_queue_sz = mhi_get_free_desc_count(mhi_dev, DMA_FROM_DEVICE); aa730a9905b7b0 Loic Poulain 2021-08-03 618 aa730a9905b7b0 Loic Poulain 2021-08-03 619 /* Register wwan link ops with MHI controller representing WWAN instance */ aa730a9905b7b0 Loic Poulain 2021-08-03 620 return wwan_register_ops(&cntrl->mhi_dev->dev, &mhi_mbim_wwan_ops, mbim, 0); aa730a9905b7b0 Loic Poulain 2021-08-03 621 } aa730a9905b7b0 Loic Poulain 2021-08-03 622 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org