:::::: :::::: Manual check reason: "low confidence static check warning: drivers/bus/mhi/ep/main.c:641:33: warning: Uninitialized variable: ring [uninitvar]" ::::::
CC: [email protected] BCC: [email protected] CC: [email protected] TO: Manivannan Sadhasivam <[email protected]> CC: Alex Elder <[email protected]> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: f2906aa863381afb0015a9eb7fefad885d4e5a56 commit: 494a6f63937744d447630c9ab2f4a58f105b69f5 bus: mhi: ep: Add support for processing channel rings date: 9 weeks ago :::::: branch date: 9 hours ago :::::: commit date: 9 weeks ago compiler: riscv64-linux-gcc (GCC) 11.3.0 reproduce (cppcheck warning): # apt-get install cppcheck git checkout 494a6f63937744d447630c9ab2f4a58f105b69f5 cppcheck --quiet --enable=style,performance,portability --template=gcc FILE If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <[email protected]> cppcheck possible warnings: (new ones prefixed by >>, may not real problems) >> drivers/bus/mhi/ep/main.c:641:33: warning: Uninitialized variable: ring >> [uninitvar] ret = mhi_ep_update_wr_offset(ring); ^ drivers/bus/mhi/ep/main.c:638:13: note: Assignment 'ring=itr->ring', assigned value is <Uninit> ring = itr->ring; ^ drivers/bus/mhi/ep/main.c:641:33: note: Uninitialized variable: ring ret = mhi_ep_update_wr_offset(ring); ^ drivers/bus/mhi/ep/main.c:689:24: warning: Uninitialized variable: itr->state [uninitvar] mhi_state_str(itr->state)); ^ vim +641 drivers/bus/mhi/ep/main.c 2b231a40e9073a Manivannan Sadhasivam 2022-02-12 618 494a6f63937744 Manivannan Sadhasivam 2022-02-12 619 static void mhi_ep_ch_ring_worker(struct work_struct *work) 494a6f63937744 Manivannan Sadhasivam 2022-02-12 620 { 494a6f63937744 Manivannan Sadhasivam 2022-02-12 621 struct mhi_ep_cntrl *mhi_cntrl = container_of(work, struct mhi_ep_cntrl, ch_ring_work); 494a6f63937744 Manivannan Sadhasivam 2022-02-12 622 struct device *dev = &mhi_cntrl->mhi_dev->dev; 494a6f63937744 Manivannan Sadhasivam 2022-02-12 623 struct mhi_ep_ring_item *itr, *tmp; 494a6f63937744 Manivannan Sadhasivam 2022-02-12 624 struct mhi_ring_element *el; 494a6f63937744 Manivannan Sadhasivam 2022-02-12 625 struct mhi_ep_ring *ring; 494a6f63937744 Manivannan Sadhasivam 2022-02-12 626 struct mhi_ep_chan *chan; 494a6f63937744 Manivannan Sadhasivam 2022-02-12 627 unsigned long flags; 494a6f63937744 Manivannan Sadhasivam 2022-02-12 628 LIST_HEAD(head); 494a6f63937744 Manivannan Sadhasivam 2022-02-12 629 int ret; 494a6f63937744 Manivannan Sadhasivam 2022-02-12 630 494a6f63937744 Manivannan Sadhasivam 2022-02-12 631 spin_lock_irqsave(&mhi_cntrl->list_lock, flags); 494a6f63937744 Manivannan Sadhasivam 2022-02-12 632 list_splice_tail_init(&mhi_cntrl->ch_db_list, &head); 494a6f63937744 Manivannan Sadhasivam 2022-02-12 633 spin_unlock_irqrestore(&mhi_cntrl->list_lock, flags); 494a6f63937744 Manivannan Sadhasivam 2022-02-12 634 494a6f63937744 Manivannan Sadhasivam 2022-02-12 635 /* Process each queued channel ring. In case of an error, just process next element. */ 494a6f63937744 Manivannan Sadhasivam 2022-02-12 636 list_for_each_entry_safe(itr, tmp, &head, node) { 494a6f63937744 Manivannan Sadhasivam 2022-02-12 637 list_del(&itr->node); 494a6f63937744 Manivannan Sadhasivam 2022-02-12 638 ring = itr->ring; 494a6f63937744 Manivannan Sadhasivam 2022-02-12 639 494a6f63937744 Manivannan Sadhasivam 2022-02-12 640 /* Update the write offset for the ring */ 494a6f63937744 Manivannan Sadhasivam 2022-02-12 @641 ret = mhi_ep_update_wr_offset(ring); 494a6f63937744 Manivannan Sadhasivam 2022-02-12 642 if (ret) { 494a6f63937744 Manivannan Sadhasivam 2022-02-12 643 dev_err(dev, "Error updating write offset for ring\n"); 494a6f63937744 Manivannan Sadhasivam 2022-02-12 644 kfree(itr); 494a6f63937744 Manivannan Sadhasivam 2022-02-12 645 continue; 494a6f63937744 Manivannan Sadhasivam 2022-02-12 646 } 494a6f63937744 Manivannan Sadhasivam 2022-02-12 647 494a6f63937744 Manivannan Sadhasivam 2022-02-12 648 /* Sanity check to make sure there are elements in the ring */ 494a6f63937744 Manivannan Sadhasivam 2022-02-12 649 if (ring->rd_offset == ring->wr_offset) { 494a6f63937744 Manivannan Sadhasivam 2022-02-12 650 kfree(itr); 494a6f63937744 Manivannan Sadhasivam 2022-02-12 651 continue; 494a6f63937744 Manivannan Sadhasivam 2022-02-12 652 } 494a6f63937744 Manivannan Sadhasivam 2022-02-12 653 494a6f63937744 Manivannan Sadhasivam 2022-02-12 654 el = &ring->ring_cache[ring->rd_offset]; 494a6f63937744 Manivannan Sadhasivam 2022-02-12 655 chan = &mhi_cntrl->mhi_chan[ring->ch_id]; 494a6f63937744 Manivannan Sadhasivam 2022-02-12 656 494a6f63937744 Manivannan Sadhasivam 2022-02-12 657 mutex_lock(&chan->lock); 494a6f63937744 Manivannan Sadhasivam 2022-02-12 658 dev_dbg(dev, "Processing the ring for channel (%u)\n", ring->ch_id); 494a6f63937744 Manivannan Sadhasivam 2022-02-12 659 ret = mhi_ep_process_ch_ring(ring, el); 494a6f63937744 Manivannan Sadhasivam 2022-02-12 660 if (ret) { 494a6f63937744 Manivannan Sadhasivam 2022-02-12 661 dev_err(dev, "Error processing ring for channel (%u): %d\n", 494a6f63937744 Manivannan Sadhasivam 2022-02-12 662 ring->ch_id, ret); 494a6f63937744 Manivannan Sadhasivam 2022-02-12 663 mutex_unlock(&chan->lock); 494a6f63937744 Manivannan Sadhasivam 2022-02-12 664 kfree(itr); 494a6f63937744 Manivannan Sadhasivam 2022-02-12 665 continue; 494a6f63937744 Manivannan Sadhasivam 2022-02-12 666 } 494a6f63937744 Manivannan Sadhasivam 2022-02-12 667 494a6f63937744 Manivannan Sadhasivam 2022-02-12 668 mutex_unlock(&chan->lock); 494a6f63937744 Manivannan Sadhasivam 2022-02-12 669 kfree(itr); 494a6f63937744 Manivannan Sadhasivam 2022-02-12 670 } 494a6f63937744 Manivannan Sadhasivam 2022-02-12 671 } 494a6f63937744 Manivannan Sadhasivam 2022-02-12 672 -- 0-DAY CI Kernel Test Service https://01.org/lkp _______________________________________________ kbuild mailing list -- [email protected] To unsubscribe send an email to [email protected]
