net: wwan: t7xx: Fix Runtime PM implementation

[You-Sheng Yang]

Upstream commit d10b3a695ba0 ("net: wwan: t7xx: Runtime PM") introduced support for Runtime PM for this driver, but due to a bug in the initialization logic the usage refcount would never reach 0, leaving the feature unused. This patchset addresses that, together with a bug found after runtime suspend was enabled.

https://<email address hidden>/

[You-Sheng Yang (vicamo)]

This affects kernel >= v5.19-rc1.

[You-Sheng Yang (vicamo)]

While this is only planned for oem-6.0/oem-6.1 and on, mark kinetic as WONTFIX.

[You-Sheng Yang (vicamo)]

For kernel v6.1 or older, it takes an additional commit 5545b7b9f294 ("net: wwan: t7xx: Add NAPI support") to backport.

[You-Sheng Yang (vicamo)]

While this patchset is to fix an already landed fix since v5.19-rc1, I added it directly into experimental kernel PPA in https://launchpad.net/~canonical-hwe-team/+archive/ubuntu/intermediate-kernel:
* linux-unstable version 6.2.0-9008.8+exp.49
  - https://launchpad.net/~canonical-hwe-team/+archive/ubuntu/experimental-unstable
* linux/lunar version 6.1.0-9014.14+exp.14
* linux-oem-6.1/jammy version 6.1.0-9006.6+exp.9
* linux-oem-6.0/jammy version 6.0.0-9011.11+exp.30

[Timo Aaltonen (tjaalton)]

for oem-6.0 this is a "won't fix" at this point

[You-Sheng Yang (vicamo)]

In linux/lunar since version 6.2.0-0.0.

[Timo Aaltonen (tjaalton)]

what's the status here for oem-6.1?