Re: files_lock deadlock?

[Martin Wilck <martin.wilck@fujitsu-siemens.com>]

Alexander Nyberg wrote:

> spin_lock_irqsave is only needed when a lock is taken both in normal
> context and in interrupt context. Clearly this lock is not intended to
> be taken in interrupt context. 

According to Rusty's unreliable guide
(http://www.kernel.org/pub/linux/kernel/people/rusty/kernel-locking/c214.html)
if some code can be called from user context as well as in a softirq, at 
least spin_lock_bh() is necessary. I am not sure whether that may be 
true for the code that modifies files_lock.

> I'll take a look, that spinlock debugging information unfortunately
> doesn't give too much info :|

Thanks!

Martin

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