[PATCH 4.14 27/75] spi: spi-axi: fix potential use-after-free after deregistration

4.14-stable review patch. If anyone has any objections, please let me know. -- From: Johan Hovold [ Upstream commit 4d5e0689dc9d5640ad46cdfbe1896b74d8df1661 ] Take an extra reference to the controller before deregistering it to prevent use-after-free in the

[PATCH 4.14 27/75] spi: spi-axi: fix potential use-after-free after deregistration

4.14-stable review patch. If anyone has any objections, please let me know. -- From: Johan Hovold [ Upstream commit 4d5e0689dc9d5640ad46cdfbe1896b74d8df1661 ] Take an extra reference to the controller before deregistering it to prevent use-after-free in the interrupt handler