mailbox: imx: Use devm_pm_runtime_enable()

Overview

In the Linux kernel, the following vulnerability has been resolved:

mailbox: imx: Use devm_pm_runtime_enable()

sashiko complained about early usage of the device while probe isn't completed. This can be mitigated by delaying the pm_runtime_enable() into the removal path instead doing it early. This ensures that in an error case the device is removed (and imx_mu_shutdown()) before pm_runtime_disable() so we don't have to do this manually.

For the order to work, lets move devm_mbox_controller_register() until after the pm-runtime part. So the reverse order will be mbox-controller removal followed by disabling pm runtime.

Use devm_pm_runtime_enable(), remove manual pm_runtime_disable() invocations and move the pm_runtime handling in probe before devm_mbox_controller_register().

Affected

• Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < b30a047744ea4344bb6f854b0a052cf276349128
• Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < adcaa21d50c3a4c884f4d0b7a95fa3bd7a07cf84
• Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 1f602619e408b6e9655ee76656a2a5ab6e89c5e4
• Linux < 6.12.111
• Linux < 6.18.53
• Linux (all versions)

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.