APPLIED[F]: [SRU][Focal/Eoan/OEM-B-OSP1][PATCH 0/5] Fix hang issue if sof fails to load firmware

[Seth Forshee]

On Fri, Feb 21, 2020 at 05:00:39PM +0800, Hui Wang wrote:
> BugLink: http://bugs.launchpad.net/bugs/1861837
> 
> If the sof driver fails to load the firmware, it doesn't release the
> resource, then it make the system hang when suspending and resuming.
> 
> After this patchset is applied, please also apply the patchset we
> just reverted 2 weeks ago, since this patchset is the fixing patches
> for the patches we reverted (#1857409). If need me to resend the
> reverted patches, I will resend them.
> 
> 
> [Impact]
> The machine hangs during suspend/resume if the sof driver fails to
> load firmware.
> 
> [Fix]
> This bug is fixed in the mainline kernel v5.6-rc1, now backported
> those patches to ubuntu kernel
> 
> [Test Case]
> sudo mv /lib/firmware/intel/sof /lib/firmware/intel/sof-bak, reboot
> then suspend and resume, the system will not hang anymore
> 
> And if the sof driver load the firmware successfully, the audio
> functions all worked well as before.
> 
> [Regression Risk]
> Low, the patches are backported from upstream kernel, and I tested
> these patches on Lenovo and Dell dmic machines.

Applied to focal/master-next, thanks!