[PATCH v2] ARM: exynos: add debug_ll_io_init() call in exynos_init_io()
olof at lixom.net
Fri Jun 7 21:12:22 EDT 2013
On Thu, Jun 06, 2013 at 08:32:04AM +0900, Kukjin Kim wrote:
> Olof Johansson wrote:
> > On Wed, Jun 5, 2013 at 1:56 PM, Doug Anderson <dianders at chromium.org>
> > wrote:
> > > If the early MMU mapping of the UART happens to get booted out of the
> > > TLB between the start of paging_init() and when we finally re-add the
> > > UART at the very end of s3c_init_cpu(), we'll get a hang at bootup if
> > > we've got early_printk enabled. Avoid this hang by calling
> > > debug_ll_io_init() early.
> > >
> > > Without this patch, you can reliably reproduce a hang when early
> > > printk is enabled by adding flush_tlb_all() at the start of
> > > exynos_init_io(). After this patch the hang goes away.
> > >
> > > Signed-off-by: Doug Anderson <dianders at chromium.org>
> > Acked-by: Olof Johansson <olof at lixom.net>
> > Kukjin, this seems appropriate for 3.10. Do you have other fixes
> > queued or should I apply this directly?
> If I remember correctly, nothing in my tree for 3.10.
> So please go ahead with my ack if you want,
> Acked-by: Kukjin Kim <kgene.kim at samsung.com>
Applied for 3.10 (together with the uncompress.h fix from Tushar)
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