Regressions in stable releases

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Hi folks,

we have (at least) two severe regressions in stable releases right now.

[SHAs are from linux-5.10.y]

2435dcfd16ac spi: mediatek: fix fifo rx mode
	Breaks SPI access on all Mediatek devices for small transactions
	(including all Mediatek based Chromebooks since they use small SPI
	 transactions for EC communication)

60789afc02f5 Bluetooth: Shutdown controller after workqueues are flushed or cancelled
	Breaks Bluetooth on various devices (Mediatek and possibly others)
	Discussion: https://lkml.org/lkml/2021/7/28/569

Unfortunately, it appears that all our testing doesn't cover SPI and Bluetooth.

I understand that upstream is just as broken until fixes are applied there.
Still, it shows that our test coverage is far from where it needs to be,
and/or that we may be too aggressive with backporting patches to stable
releases.

If you have an idea how to improve the situation, please let me know.

Thanks,
Guenter



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