On Thu, Feb 14, 2013 at 06:14:27PM +0000, Grant Likely wrote: > 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.lik...@secretlab.ca> > Tested-by: Haojian Zhuang <haojian.zhu...@linaro.org> > Cc: Arnd Bergmann <a...@arndb.de> > Cc: Russell King <li...@arm.linux.org.uk> > Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org> > Cc: Linus Torvalds <torva...@linux-foundation.org> > Cc: sta...@vger.kernel.org > --- > > Hi Greg and Linus, > > Okay, so this is really late to be sending for v3.8, and it doesn't have > nearly the amount of testing that I would like it to have. I haven't > even put it into linux-next yet. However, it is a real bug that some of > the Linaro folks have run into that is caused by deferred probe. It > isn't very widespread, but it is there. > > It probably should be in v3.8, but given how ridiculously late it is and > that it isn't a widespread problem it would probably be just fine to go > in during the v3.9 merge window and get backported to linux-stable. If I > don't hear otherwise then that is what I'll do. > > Still, here it is. If you think it really should be merged before > tagging v3.8 then please go ahead and apply it.
Nah, we can wait for 3.9-rc1, I'll queue it up in my tree and push it to Linus for then, and tag it for stable kernels to be backported at that point in time. thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
