From e2cec7d6853712295cef5377762165a489b2957f Mon Sep 17 00:00:00 2001 From: John Stultz Date: Tue, 25 Feb 2020 05:08:24 +0000 Subject: driver core: Set deferred_probe_timeout to a longer default if CONFIG_MODULES is set When using modules, its common for the modules not to be loaded until quite late by userland. With the current code, driver_deferred_probe_check_state() will stop returning EPROBE_DEFER after late_initcall, which can cause module dependency resolution to fail after that. So allow a longer window of 30 seconds (picked somewhat arbitrarily, but influenced by the similar regulator core timeout value) in the case where modules are enabled. Cc: linux-pm@vger.kernel.org Cc: Greg Kroah-Hartman Cc: Linus Walleij Cc: Thierry Reding Cc: Mark Brown Cc: Liam Girdwood Cc: Bjorn Andersson Cc: Saravana Kannan Cc: Todd Kjos Cc: Len Brown Cc: Pavel Machek Cc: Ulf Hansson Cc: Kevin Hilman Cc: "Rafael J. Wysocki" Cc: Rob Herring Reviewed-by: Bjorn Andersson Reviewed-by: Rafael J. Wysocki Signed-off-by: John Stultz Link: https://lore.kernel.org/r/20200225050828.56458-3-john.stultz@linaro.org Signed-off-by: Greg Kroah-Hartman --- drivers/base/dd.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'drivers/base') diff --git a/drivers/base/dd.c b/drivers/base/dd.c index d75b34de6964..fe26f2574a6d 100644 --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -224,7 +224,16 @@ static int deferred_devs_show(struct seq_file *s, void *data) } DEFINE_SHOW_ATTRIBUTE(deferred_devs); +#ifdef CONFIG_MODULES +/* + * In the case of modules, set the default probe timeout to + * 30 seconds to give userland some time to load needed modules + */ +static int deferred_probe_timeout = 30; +#else +/* In the case of !modules, no probe timeout needed */ static int deferred_probe_timeout = -1; +#endif static int __init deferred_probe_timeout_setup(char *str) { int timeout; -- cgit v1.2.3