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authorAndre Przywara <andre.przywara@arm.com>2021-07-22 16:25:48 +0300
committerLinus Walleij <linus.walleij@linaro.org>2021-08-10 15:55:35 +0300
commitd1dee814168538eba166ae4150b37f0d88257884 (patch)
treed36fc8e4ffab8927d82b132689da07ac689a394e
parent798a315fc359aa6dbe48e09d802aa59b7e158ffc (diff)
downloadlinux-d1dee814168538eba166ae4150b37f0d88257884.tar.xz
pinctrl: sunxi: Don't underestimate number of functions
When we are building all the various pinctrl structures for the Allwinner pinctrl devices, we do some estimation about the maximum number of distinct function (names) that we will need. So far we take the number of pins as an upper bound, even though we can actually have up to four special functions per pin. This wasn't a problem until now, since we indeed have typically far more pins than functions, and most pins share common functions. However the H616 "-r" pin controller has only two pins, but four functions, so we run over the end of the array when we are looking for a matching function name in sunxi_pinctrl_add_function - there is no NULL sentinel left that would terminate the loop: [ 8.200648] Unable to handle kernel paging request at virtual address fffdff7efbefaff5 [ 8.209179] Mem abort info: .... [ 8.368456] Call trace: [ 8.370925] __pi_strcmp+0x90/0xf0 [ 8.374559] sun50i_h616_r_pinctrl_probe+0x1c/0x28 [ 8.379557] platform_probe+0x68/0xd8 Do an actual worst case allocation (4 functions per pin, three common functions and the sentinel) for the initial array allocation. This is now heavily overestimating the number of functions in the common case, but we will reallocate this array later with the actual number of functions, so it's only temporarily. Fixes: 561c1cf17c46 ("pinctrl: sunxi: Add support for the Allwinner H616-R pin controller") Signed-off-by: Andre Przywara <andre.przywara@arm.com> Acked-by: Maxime Ripard <maxime@cerno.tech> Link: https://lore.kernel.org/r/20210722132548.22121-1-andre.przywara@arm.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
-rw-r--r--drivers/pinctrl/sunxi/pinctrl-sunxi.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/pinctrl/sunxi/pinctrl-sunxi.c b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
index dc8d39ae045b..9c7679c06dca 100644
--- a/drivers/pinctrl/sunxi/pinctrl-sunxi.c
+++ b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
@@ -1219,10 +1219,12 @@ static int sunxi_pinctrl_build_state(struct platform_device *pdev)
}
/*
- * We suppose that we won't have any more functions than pins,
- * we'll reallocate that later anyway
+ * Find an upper bound for the maximum number of functions: in
+ * the worst case we have gpio_in, gpio_out, irq and up to four
+ * special functions per pin, plus one entry for the sentinel.
+ * We'll reallocate that later anyway.
*/
- pctl->functions = kcalloc(pctl->ngroups,
+ pctl->functions = kcalloc(4 * pctl->ngroups + 4,
sizeof(*pctl->functions),
GFP_KERNEL);
if (!pctl->functions)