tree 9f1de1a21ff1e1d5465b535f08365bafdb0f74d8
parent b3564c2cf464e11f8cb4f8d9c124e5e0f5418e3f
author Anton Vorontsov <anton.vorontsov@linaro.org> 1348522075 -0700
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1348692692 -0700

tty/serial/amba-pl011: Quiesce interrupts in poll_get_char

We need to quiesce interrupts in the poll_get_char routine, otherwise,
if used with KGDB NMI debugger, we'll keep reentering the NMI.

Quiescing interrupts is pretty straightforward, except for TXIM
interrupt. The interrupt has "ready to transmit" meaning, so it's
almost always raised, and the only way to silence it is to mask it. But
that's OK, ops->start_tx will unmask it.

Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>