Re: [PATCH stable (4.4 + 4.9)] gpio: fix oops resulting from calling of_get_named_gpio(NULL, ...)

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On Fri, Aug 14, 2020 at 09:47:11AM +0200, Uwe Kleine-König wrote:
This happens for the spi-imx driver when running a dt-enabled kernel on
a non-dt machine on Linux 4.0. Among the still supported stable versions
only 4.4 and 4.9 are affected. (However the spi-imx driver doesn't call
of_get_named_gpio() since v4.8-rc1 (commit b36581df7e78 ("spi: imx:
Using existing properties for chipselects")) any more, but the problem
might still affect other users of of_get_named_gpio().)

In 4.14-rc1 this problem is gone with
commit 7eb6ce2f2723 ("gpio: Convert to using %pOF instead of
full_name"). This commit however doesn't seem sensible to backport as it
depends on ce4fecf1fe15 ("vsprintf: Add %p extension "%pOF" for device
tree") which doesn't trivially apply to v4.4.

Queued up for 4.9 and 4.4, thanks!

--
Thanks,
Sasha



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