On Fri, Jun 05, 2015 at 03:07:47PM +0100, Dave Martin wrote:
> pl011_tx_softirq() currently uses spin_{,un}lock(), which are not
> sufficient to inhibit pl011_int() from being triggered by a local
> IRQ and trying to re-take the same lock. This can lead to
> deadlocks.
>
> This patch uses the _irq() locking variants instead to ensure that
> pl011_int() handling for a given port is deferred until any
> pl011_tx_softirq() work for that port is complete.
>
> Signed-off-by: Dave Martin <Dave.Martin@xxxxxxx>
> Tested-by: Robin Murphy <robin.murphy@xxxxxxx>
> Cc: stable <stable@xxxxxxxxxxxxxxx> # 4.1
> ---
>
> Another candidate for v4.1 if possible (sorry!) -- I thought this change
> was already in, but it went astray when I was refactoring.
Too late for 4.1, sorry. This doesn't apply to my tty-next branch,
otherwise I would have queued it up there. Care to redo it and mark it
for -stable, like I did above, and resend it?
thanks,
greg k-h
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