From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: multipart/mixed; boundary="===============8553434423174460960==" MIME-Version: 1.0 From: kernel test robot Subject: drivers/bus/mhi/ep/main.c:641:33: warning: Uninitialized variable: ring [uninitvar] Date: Mon, 06 Jun 2022 17:10:18 +0800 Message-ID: <202206061719.FTH5onJU-lkp@intel.com> List-Id: To: kbuild@lists.01.org --===============8553434423174460960== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable :::::: = :::::: Manual check reason: "low confidence static check warning: drivers/b= us/mhi/ep/main.c:641:33: warning: Uninitialized variable: ring [uninitvar]" :::::: = CC: kbuild-all(a)lists.01.org BCC: lkp(a)intel.com CC: linux-kernel(a)vger.kernel.org TO: Manivannan Sadhasivam CC: Alex Elder 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=3Dstyle,performance,portability --templat= e=3Dgcc FILE If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot 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 =3D mhi_ep_update_wr_offset(ring); ^ drivers/bus/mhi/ep/main.c:638:13: note: Assignment 'ring=3Ditr->ring', a= ssigned value is ring =3D itr->ring; ^ drivers/bus/mhi/ep/main.c:641:33: note: Uninitialized variable: ring ret =3D 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 =3D container_of(work, struct mhi_ep_cntrl, ch_ring_work); 494a6f63937744 Manivannan Sadhasivam 2022-02-12 622 struct device *dev = =3D &mhi_cntrl->mhi_dev->dev; 494a6f63937744 Manivannan Sadhasivam 2022-02-12 623 struct mhi_ep_ring_i= tem *itr, *tmp; 494a6f63937744 Manivannan Sadhasivam 2022-02-12 624 struct mhi_ring_elem= ent *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(&m= hi_cntrl->list_lock, flags); 494a6f63937744 Manivannan Sadhasivam 2022-02-12 632 list_splice_tail_ini= t(&mhi_cntrl->ch_db_list, &head); 494a6f63937744 Manivannan Sadhasivam 2022-02-12 633 spin_unlock_irqresto= re(&mhi_cntrl->list_lock, flags); 494a6f63937744 Manivannan Sadhasivam 2022-02-12 634 = 494a6f63937744 Manivannan Sadhasivam 2022-02-12 635 /* Process each queu= ed 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 =3D 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 =3D mhi_ep_upda= te_wr_offset(ring); 494a6f63937744 Manivannan Sadhasivam 2022-02-12 642 if (ret) { 494a6f63937744 Manivannan Sadhasivam 2022-02-12 643 dev_err(dev, "Erro= r 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= =3D=3D 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 =3D &ring->ring_= cache[ring->rd_offset]; 494a6f63937744 Manivannan Sadhasivam 2022-02-12 655 chan =3D &mhi_cntrl= ->mhi_chan[ring->ch_id]; 494a6f63937744 Manivannan Sadhasivam 2022-02-12 656 = 494a6f63937744 Manivannan Sadhasivam 2022-02-12 657 mutex_lock(&chan->l= ock); 494a6f63937744 Manivannan Sadhasivam 2022-02-12 658 dev_dbg(dev, "Proce= ssing the ring for channel (%u)\n", ring->ch_id); 494a6f63937744 Manivannan Sadhasivam 2022-02-12 659 ret =3D mhi_ep_proc= ess_ch_ring(ring, el); 494a6f63937744 Manivannan Sadhasivam 2022-02-12 660 if (ret) { 494a6f63937744 Manivannan Sadhasivam 2022-02-12 661 dev_err(dev, "Erro= r 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 --===============8553434423174460960==--