OMAP2+: PM/serial: hold console semaphore while OMAP UARTs are disabled

[Paul Walmsley]

Hi

On Thu, 25 Nov 2010, Jean Pihet wrote:

> On Thu, Nov 25, 2010 at 12:49 AM, Paul Walmsley <paul at pwsan.com> wrote:
> >
> > The console semaphore must be held while the OMAP UART devices are
> > disabled, lest a console write cause an ARM abort (and a kernel crash)
> > when the underlying console device is inaccessible.  These crashes
> > only occur when the console is on one of the OMAP internal serial
> > ports.
> This does not fix the issue for me on Beagle (console on ttyO2).
> 
> Doing:
>   / # echo 5 > /sys/devices/platform/omap/omap-hsuart.0/sleep_timeout
>   / # echo 5 > /sys/devices/platform/omap/omap-hsuart.1/sleep_timeout
>   / # echo 5 > /sys/devices/platform/omap/omap-hsuart.2/sleep_timeout
> and waiting 5 seconds hangs the console.

By the way, I just tried this on a Beagle 35xx rev C2, with Tony's commit 
063d907edaf3fbf9776c189c3e02f2c7a129d18c, and did not see any hang.   Are 
you using a linux-omap kernel?


- Paul