Re: [PATCH v3] EM28xx - fix deadlock when unplugging and replugging a DVB adapter

[Mauro Carvalho Chehab <mchehab@redhat.com>]

Em 24-09-2011 17:54, Chris Rankin escreveu:
> This fixes the deadlock that occurs with either multiple PCTV 290e adapters or when a single PCTV 290e adapter is replugged.
> 
> For DVB devices, the device lock must now *not* be held when adding/removing either a device or an extension to the respective lists. (Because em28xx_init_dvb() will want to take the lock instead).
> 
> Conversely, for Audio-Only devices, the device lock *must* be held when adding/removing either a device or an extension to the respective lists.
> 
> Signed-off-by: Chris Rankin <ranki...@yahoo.com>

Ok, I've applied it, but it doesn't sound a good idea to me to do:

+	mutex_unlock(&dev->lock);
 	em28xx_init_extension(dev);
+	mutex_lock(&dev->lock);

I'll later test it with some hardware and see how well this behaves
in practice.

Thanks,
Mauro