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authorGrant Likely <grant.likely@secretlab.ca>2013-02-14 18:14:27 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-02-15 10:50:33 -0800
commitd72cca1eee5b26e313da2a380d4862924e271031 (patch)
treec128f79127affb58c93324b7a4116868bc4ee6a8 /drivers/base
parent3213f631da786bee317363d251a0cc54b74bc827 (diff)
downloadop-kernel-dev-d72cca1eee5b26e313da2a380d4862924e271031.zip
op-kernel-dev-d72cca1eee5b26e313da2a380d4862924e271031.tar.gz
drivercore: Fix ordering between deferred_probe and exiting initcalls
One of the side effects of deferred probe is that some drivers which used to be probed before initcalls completed are now happening slightly later. This causes two problems. - If a console driver gets deferred, then it may not be ready when userspace starts. For example, if a uart depends on pinctrl, then the uart will get deferred and /dev/console will not be available - __init sections will be discarded before built-in drivers are probed. Strictly speaking, __init functions should not be called in a drivers __probe path, but there are a lot of drivers (console stuff again) that do anyway. In the past it was perfectly safe to do so because all built-in drivers got probed before the end of initcalls. This patch fixes the problem by forcing the first pass of the deferred list to complete at late_initcall time. This is late enough to catch the drivers that are known to have the above issues. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Tested-by: Haojian Zhuang <haojian.zhuang@linaro.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Russell King <linux@arm.linux.org.uk> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: stable <stable@vger.kernel.org> # 3.4+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/dd.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index e3bbed8..61d3e1b 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -172,6 +172,8 @@ static int deferred_probe_initcall(void)
driver_deferred_probe_enable = true;
driver_deferred_probe_trigger();
+ /* Sort as many dependencies as possible before exiting initcalls */
+ flush_workqueue(deferred_wq);
return 0;
}
late_initcall(deferred_probe_initcall);
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