[PATCH 1/1] mmc: sdhci: fix lockdep error on tunning routine

[Peter Zijlstra]

On Thu, Dec 26, 2013 at 03:58:20PM +0800, Dong Aisheng wrote:
> > It's strange that this issue did not happen on kernel 3.10.17 with the same
> > code. And looking at the code, before call spin_lock we already disable the mmc
> > controller irq, per on my understanding, the deadlock given by lockdep may not
> > be able to happen(pls fix me if wrong).
> > May the lockdep not track the specific irq disable?
> > Copy lockdep guy to comment.

No, lockdep also doesn't know only that one line can take this lock.
Lockdep only knows a lock is taken from IRQ context, and disabling one
line still allows IRQs to happen and therefore it yells.