Re: [PATCH v1] net/8021q/vlan: check the return value of vlan_vid_add()

From: kernel test robot
Date: Mon Sep 19 2022 - 11:22:53 EST

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Hi Li,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on net/master]
[also build test WARNING on net-next/master linus/master v6.0-rc6 next-20220919]
[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/Li-Zhong/net-8021q-vlan-check-the-return-value-of-vlan_vid_add/20220919-154737
base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git 96628951869c0dedf0377adca01c8675172d8639
config: x86_64-randconfig-a005-20220919 (https://download.01.org/0day-ci/archive/20220919/202209192322.WqMpsD4X-lkp@xxxxxxxxx/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
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/intel-lab-lkp/linux/commit/c44a44ed52c467523d28a7764ee01e23d3928945
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Li-Zhong/net-8021q-vlan-check-the-return-value-of-vlan_vid_add/20220919-154737
git checkout c44a44ed52c467523d28a7764ee01e23d3928945
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash net/8021q/

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

All warnings (new ones prefixed by >>):

>> net/8021q/vlan.c:385:7: warning: mixing declarations and code is incompatible with standards before C99 [-Wdeclaration-after-statement]
int err = vlan_vid_add(dev, htons(ETH_P_8021Q), 0);
^
1 warning generated.

vim +385 net/8021q/vlan.c

359
360 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
361 void *ptr)
362 {
363 struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
364 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
365 struct vlan_group *grp;
366 struct vlan_info *vlan_info;
367 int i, flgs;
368 struct net_device *vlandev;
369 struct vlan_dev_priv *vlan;
370 bool last = false;
371 LIST_HEAD(list);
372 int err;
373
374 if (is_vlan_dev(dev)) {
375 int err = __vlan_device_event(dev, event);
376
377 if (err)
378 return notifier_from_errno(err);
379 }
380
381 if ((event == NETDEV_UP) &&
382 (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) {
383 pr_info("adding VLAN 0 to HW filter on device %s\n",
384 dev->name);
> 385 int err = vlan_vid_add(dev, htons(ETH_P_8021Q), 0);
386
387 if (err)
388 return notifier_from_errno(err);
389 }
390 if (event == NETDEV_DOWN &&
391 (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER))
392 vlan_vid_del(dev, htons(ETH_P_8021Q), 0);
393
394 vlan_info = rtnl_dereference(dev->vlan_info);
395 if (!vlan_info)
396 goto out;
397 grp = &vlan_info->grp;
398
399 /* It is OK that we do not hold the group lock right now,
400 * as we run under the RTNL lock.
401 */
402
403 switch (event) {
404 case NETDEV_CHANGE:
405 /* Propagate real device state to vlan devices */
406 vlan_group_for_each_dev(grp, i, vlandev)
407 vlan_stacked_transfer_operstate(dev, vlandev,
408 vlan_dev_priv(vlandev));
409 break;
410
411 case NETDEV_CHANGEADDR:
412 /* Adjust unicast filters on underlying device */
413 vlan_group_for_each_dev(grp, i, vlandev) {
414 flgs = vlandev->flags;
415 if (!(flgs & IFF_UP))
416 continue;
417
418 vlan_sync_address(dev, vlandev);
419 }
420 break;
421
422 case NETDEV_CHANGEMTU:
423 vlan_group_for_each_dev(grp, i, vlandev) {
424 if (vlandev->mtu <= dev->mtu)
425 continue;
426
427 dev_set_mtu(vlandev, dev->mtu);
428 }
429 break;
430
431 case NETDEV_FEAT_CHANGE:
432 /* Propagate device features to underlying device */
433 vlan_group_for_each_dev(grp, i, vlandev)
434 vlan_transfer_features(dev, vlandev);
435 break;
436
437 case NETDEV_DOWN: {
438 struct net_device *tmp;
439 LIST_HEAD(close_list);
440
441 /* Put all VLANs for this dev in the down state too. */
442 vlan_group_for_each_dev(grp, i, vlandev) {
443 flgs = vlandev->flags;
444 if (!(flgs & IFF_UP))
445 continue;
446
447 vlan = vlan_dev_priv(vlandev);
448 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
449 list_add(&vlandev->close_list, &close_list);
450 }
451
452 dev_close_many(&close_list, false);
453
454 list_for_each_entry_safe(vlandev, tmp, &close_list, close_list) {
455 vlan_stacked_transfer_operstate(dev, vlandev,
456 vlan_dev_priv(vlandev));
457 list_del_init(&vlandev->close_list);
458 }
459 list_del(&close_list);
460 break;
461 }
462 case NETDEV_UP:
463 /* Put all VLANs for this dev in the up state too. */
464 vlan_group_for_each_dev(grp, i, vlandev) {
465 flgs = dev_get_flags(vlandev);
466 if (flgs & IFF_UP)
467 continue;
468
469 vlan = vlan_dev_priv(vlandev);
470 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
471 dev_change_flags(vlandev, flgs | IFF_UP,
472 extack);
473 vlan_stacked_transfer_operstate(dev, vlandev, vlan);
474 }
475 break;
476
477 case NETDEV_UNREGISTER:
478 /* twiddle thumbs on netns device moves */
479 if (dev->reg_state != NETREG_UNREGISTERING)
480 break;
481
482 vlan_group_for_each_dev(grp, i, vlandev) {
483 /* removal of last vid destroys vlan_info, abort
484 * afterwards */
485 if (vlan_info->nr_vids == 1)
486 last = true;
487
488 unregister_vlan_dev(vlandev, &list);
489 if (last)
490 break;
491 }
492 unregister_netdevice_many(&list);
493 break;
494
495 case NETDEV_PRE_TYPE_CHANGE:
496 /* Forbid underlaying device to change its type. */
497 if (vlan_uses_dev(dev))
498 return NOTIFY_BAD;
499 break;
500
501 case NETDEV_NOTIFY_PEERS:
502 case NETDEV_BONDING_FAILOVER:
503 case NETDEV_RESEND_IGMP:
504 /* Propagate to vlan devices */
505 vlan_group_for_each_dev(grp, i, vlandev)
506 call_netdevice_notifiers(event, vlandev);
507 break;
508
509 case NETDEV_CVLAN_FILTER_PUSH_INFO:
510 err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021Q));
511 if (err)
512 return notifier_from_errno(err);
513 break;
514
515 case NETDEV_CVLAN_FILTER_DROP_INFO:
516 vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021Q));
517 break;
518
519 case NETDEV_SVLAN_FILTER_PUSH_INFO:
520 err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021AD));
521 if (err)
522 return notifier_from_errno(err);
523 break;
524
525 case NETDEV_SVLAN_FILTER_DROP_INFO:
526 vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021AD));
527 break;
528 }
529
530 out:
531 return NOTIFY_DONE;
532 }
533

--
0-DAY CI Kernel Test Service
https://01.org/lkp

Next message: syzbot: "Re: [syzbot] WARNING: suspicious RCU usage in evict"
Previous message: Rafael J. Wysocki: "Re: [PATCH v2 00/44] cpuidle,rcu: Clean up the mess"
In reply to: kernel test robot: "Re: [PATCH v1] net/8021q/vlan: check the return value of vlan_vid_add()"
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