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While running an Ubuntu kernel (not a mainline or third-party kernel)
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apport-collect 1906851
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This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1906851
Title:
Fix reading speed and duplex sysfs on igc device
Status in HWE Next:
New
Status in linux package in Ubuntu:
Incomplete
Status in linux-oem-5.10 package in Ubuntu:
Invalid
Status in linux-oem-5.6 package in Ubuntu:
Invalid
Status in linux source package in Focal:
Confirmed
Status in linux-oem-5.10 source package in Focal:
Confirmed
Status in linux-oem-5.6 source package in Focal:
Confirmed
Status in linux source package in Groovy:
Confirmed
Status in linux-oem-5.10 source package in Groovy:
Won't Fix
Status in linux-oem-5.6 source package in Groovy:
Won't Fix
Bug description:
[Impact]
Reading speed and duplex sysfs on igc device when it's runtime suspended
will make it stops working. Even kernel panic sometimes.
[Fix]
If igc device is runtime suspended, it means link isn't up, so we can
just report speed as -1 and duplex as unknown.
[Test]
$ cat /sys/class/net/*/speed
Then we'll see:
[ 123.449883] igc 0000:03:00.0 enp3s0: PCIe link lost, device now detached
[ 123.450052] BUG: kernel NULL pointer dereference, address: 0000000000000008
With the fix applied,
$ cat /sys/class/net/*/speed
-1
[Where problems could occur]
Not at all. Reading register when device is runtime suspended is just
wrong. The fix prevents it from happening.
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