spi: fix use-after-free at controller deregistration

Johan Hovold linux-spi lkml stable 2 versions Oct 29, 2017 – Oct 30, 2017 New

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#	Subject and files	Size	Replies
1/3	spi: fix use-after-free at controller deregistration`drivers/spi/spi.c`	+3 -2	0 replies
2/3	spi: document odd controller reference handling`drivers/spi/spi.c`	+3 -1	0 replies
3/3	spi: spi-axi: fix potential use-after-free after deregistration`drivers/spi/spi-axi-spi-engine.c`	+3 -1	0 replies

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