Public bug reported:
[Impact]
There is a new feature added from stable kernel
3fa98d338296 ("PCI / PM: Allow runtime PM without callback functions")
and this feature lead to the backport-iwlwifi dkms driver fails to resume from
runtime suspended.
[Fix]
iwlwifi driver fails if pci_finish_runtime_suspend() is called, so check if
runtime_suspend() function is provided before calling this function.
[Test]
Verified on Dell Precision 5540, wifi keeps working even after S3 test.
[Regression]
Low. pci_finish_runtime_suspend() puts the PCI device into a low power state,
it doesn't hurt if we don't call it, and it passes the 30 times S3 test, so it
should be fine to not to call it if runtime_suspend function is not provided.
** Affects: linux-oem (Ubuntu)
Importance: Undecided
Status: In Progress
** Affects: linux-oem (Ubuntu Bionic)
Importance: Undecided
Assignee: AceLan Kao (acelankao)
Status: In Progress
** Patch added:
"0001-UBUNTU-SAUCE-PCI-PM-Don-t-call-pci_finish_runtime_su.patch"
https://bugs.launchpad.net/bugs/1842388/+attachment/5286315/+files/0001-UBUNTU-SAUCE-PCI-PM-Don-t-call-pci_finish_runtime_su.patch
** Also affects: linux-oem (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: linux-oem (Ubuntu Bionic)
Assignee: (unassigned) => AceLan Kao (acelankao)
** Changed in: linux-oem (Ubuntu Bionic)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/1842388
Title:
Timeout waiting for hardware access (CSR_GP_CNTRL 0xffffffff) with
backport-iwlwifi-dkms 7744 against 4.15.0-1051-oem
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