On Thu, Jul 09, 2015 at 11:57:12AM +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.
>
> Fixes: 734745caeb9f serial/amba-pl011: Activate TX IRQ passively
> Signed-off-by: Dave Martin <Dave.Martin@xxxxxxx>
> Tested-by: Robin Murphy <robin.murphy@xxxxxxx>
> Tested-by: Stefan Wahren <stefan.wahren@xxxxxxxx>
> Cc: stable <stable@xxxxxxxxxxxxxxx> # 4.1
> ---
> drivers/tty/serial/amba-pl011.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
This doesn't apply at all to 4.2-rc3, so I can't apply it :(
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html