From: Thierry Reding treding@nvidia.com
[ Upstream commit 84f28fc38d2ff99e2ac623325ba37809da611b8e ]
driver_deferred_probe_check_state() may return -ETIMEDOUT instead of -EPROBE_DEFER after all built-in drivers have been probed. This can cause issues for built-in drivers that depend on resources provided by loadable modules.
One such case happens on Tegra where I2C controllers are used during early boot to set up the system PMIC, so the I2C driver needs to be a built-in driver. At the same time, some instances of the I2C controller depend on the DPAUX hardware for pinmuxing. Since the DPAUX is handled by the display driver, which is usually not built-in, the pin control states will not become available until after the root filesystem has been mounted and the display driver loaded from it.
Fixes: bec6c0ecb243 ("pinctrl: Remove use of driver_deferred_probe_check_state_continue()") Suggested-by: John Stultz john.stultz@linaro.org Signed-off-by: Thierry Reding treding@nvidia.com Link: https://lore.kernel.org/r/20200825143348.1358679-1-thierry.reding@gmail.com Signed-off-by: Linus Walleij linus.walleij@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/pinctrl/devicetree.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/pinctrl/devicetree.c b/drivers/pinctrl/devicetree.c index 5eff8c2965528..3fb2387147189 100644 --- a/drivers/pinctrl/devicetree.c +++ b/drivers/pinctrl/devicetree.c @@ -130,9 +130,8 @@ static int dt_to_map_one_config(struct pinctrl *p, if (!np_pctldev || of_node_is_root(np_pctldev)) { of_node_put(np_pctldev); ret = driver_deferred_probe_check_state(p->dev); - /* keep deferring if modules are enabled unless we've timed out */ - if (IS_ENABLED(CONFIG_MODULES) && !allow_default && - (ret == -ENODEV)) + /* keep deferring if modules are enabled */ + if (IS_ENABLED(CONFIG_MODULES) && !allow_default && ret < 0) ret = -EPROBE_DEFER; return ret; }