mac80211_hwsim devices do not have a "driver" attribute

Bug #1166250 reported by Martin Pitt on 2013-04-08
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
Medium
Unassigned

Bug Description

NetworkManager does not get along with interfaces created by mac80211_hwsim:

NetworkManager[24027]: <warn> /sys/devices/virtual/mac80211_hwsim/hwsim0/net/wlan1: couldn't determine device driver; ignoring...

It calls udev_device_get_driver() on the net device (wlan0) (and failing that, on its parent), but that fails because hwsim doesn't
have a driver attribute. My real intel wifi does:

lrwxrwxrwx 1 root root 0 Apr 3 06:19 /sys/class/net/wlan0/device/driver -> ../../../../bus/pci/drivers/iwlwifi

But /sys/class/net/wlan1/device/ only has the default "uevent" and subsystem link.

I figured out the reason, and sent a patch to the wireless maintainer Johannes Berg, who applied it in his tree:

https://git.kernel.org/cgit/linux/kernel/git/jberg/mac80211-next.git/commit/?id=6d665c5384bbc64c95d87ebde8ce39052a48fa81

Related branches

CVE References

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1166250

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

Changed in linux (Ubuntu):
status: New → Incomplete
Joseph Salisbury (jsalisbury) wrote :

Thanks for sending your patch upstream, so it gets included in the mainline kernel. Do you intend to also submit your patch to the Ubuntu kernel team mailing list for inclusion in Raring or other stable releases? If not, it can be cherry-picked from mainline when it lands there.

tags: added: kernel-bug-exists-upstream kernel-da-key raring
Changed in linux (Ubuntu):
importance: Undecided → Medium
status: Incomplete → Triaged
tags: added: bot-stop-nagging
Martin Pitt (pitti) wrote :

Joseph, Andy suggested to also send it to kernel-team@, so I did that now (it needs moderation). It's not a blocker if it doesn't land in raring, as we could apply a workaround in NM. But if it's easy to fit in and doesn't break freeze rules, I of course wouldn't mind getting it into raring.

Martin Pitt (pitti) wrote :

I just got Leann's "Applied" email. Thanks!

Changed in linux (Ubuntu):
status: Triaged → Fix Committed
Launchpad Janitor (janitor) wrote :
Download full text (4.5 KiB)

This bug was fixed in the package linux - 3.8.0-18.28

---------------
linux (3.8.0-18.28) raring; urgency=low

  [ Andy Whitcroft ]

  * (debian) fix internal linkage for separated header packages
    - LP: #1165259

  [ Gavin Guo ]

  * SAUCE: Bluetooth: Add support for Broadcom 413c:8143
    - LP: #1166113

  [ John Johansen ]

  * SAUCE: (no-up) apparmor: Fix quieting of audit messages for network
    mediation
    - LP: #1163259

  [ Kamal Mostafa ]

  * SAUCE: (no-up) drm/i915: quirk no PCH_PWM_ENABLE for Dell XPS13
    backlight
    - LP: #1162026, #1163720

  [ Leann Ogasawara ]

  * [Config] Disable CONFIG_PARPORT_PC_FIFO
    - LP: #339752

  [ Martin Pitt ]

  * SAUCE: (no-up) mac80211_hwsim: Register and bind to driver
    - LP: #1166250

  [ Paolo Pisati ]

  * [Config] RTC_DRV_PL031=y

  [ Stefan Bader ]

  * (debian) Abort build on unresolved symbols
    - LP: #1166197

  [ Tim Gardner ]

  * [Config] Add libceph to inclusion list
  * [Config] Drop all inclusion list modules with unsatisfied dependencies
  * SAUCE: (no-up) Remove emi62 files duplicated in linux-firmware
  * SAUCE: (no-up) Remove emi26 files duplicated in linux-firmware
  * SAUCE: (no-up) Remove whiteheat files duplicated in linux-firmware
  * Release Tracking Bug
    - LP: #1168040

  [ Upstream Kernel Changes ]

  * TTY: do not update atime/mtime on read/write
    - LP: #1097680
    - CVE-2013-0160
  * KVM: x86: Convert MSR_KVM_SYSTEM_TIME to use gfn_to_hva_cache functions
    (CVE-2013-1797)
    - LP: #1158258
    - CVE-2013-1797
  * KVM: Fix bounds checking in ioapic indirect register reads
    (CVE-2013-1798)
    - LP: #1158262
    - CVE-2013-1798
  * drm/i915: HDMI/DP - ELD info refresh support for Haswell
    - LP: #1011438
  * ALSA - HDA: New PCI ID for Haswell ULT
    - LP: #1011438
  * ALSA: hda - Support rereading widgets under the function group
    - LP: #1011438
  * ALSA: hda - Add fixup for Haswell to enable all pin and convertor
    widgets
    - LP: #1011438
  * libata: fix DMA to stack in reading devslp_timing parameters
    - LP: #1031173
  * dmaengine: dw_dmac: remove CLK dependency
    - LP: #1031163
  * dmaengine: dw_dmac: Enhance device tree support
    - LP: #1031163
  * dmaengine: dw_dmac: amend description and indentation
    - LP: #1031163
  * dw_dmac: change dev_printk() to corresponding macros
    - LP: #1031163
  * dw_dmac: don't call platform_get_drvdata twice
    - LP: #1031163
  * dw_dmac: change dev_crit to dev_WARN in dwc_handle_error
    - LP: #1031163
  * dw_dmac: introduce to_dw_desc() macro
    - LP: #1031163
  * dw_dmac: absence of pdata isn't critical when autocfg is set
    - LP: #1031163
  * dw_dmac: check for mapping errors
    - LP: #1031163
  * dw_dmac: remove redundant check
    - LP: #1031163
  * dw_dmac: update tx_node_active in dwc_do_single_block
    - LP: #1031163
  * dma: dw_dmac: add dwc_chan_pause and dwc_chan_resume
    - LP: #1031163
  * dmaengine: introduce is_slave_direction function
    - LP: #1031163
  * dmaengine: add possibility for cyclic transfers
    - LP: #1031163
  * dma: dw_dmac: check direction properly in dw_dma_cyclic_prep
    - LP: #1031163
  * dma: ep93xx_dma: reuse is_slave_direction helpe...

Read more...

Changed in linux (Ubuntu):
status: Fix Committed → Fix Released

The verification of this Stable Release Update has completed successfully and the package has now been released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regresssions.

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