[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v3 2/7] xen/pciback: Don't deadlock when unbinding.
On Wed, Jul 09, 2014 at 01:21:12PM +0100, David Vrabel wrote: > On 08/07/14 19:58, konrad@xxxxxxxxxx wrote: > > --- a/drivers/xen/xen-pciback/pci_stub.c > > +++ b/drivers/xen/xen-pciback/pci_stub.c > > @@ -277,10 +277,15 @@ void pcistub_put_pci_dev(struct pci_dev *dev) > > * (so it's ready for the next domain) > > */ > > > > - /* This is OK - we are running from workqueue context > > - * and want to inhibit the user from fiddling with 'reset' > > + /* We might be holding the PCI lock (see comment at the top of the > > + * function) - as such try lock and if we can't then don't worry - > > + * as either: > > + * - we are 'unbind' in which case 'pcistub_device_release' gets > > + * called which does the locked version of this. > > + * - the toolstack has the smarts to do it and has done the > > + * reset on SysFS before assigning this device to another guest. > > */ > > - pci_reset_function(dev); > > + pci_try_reset_function(dev); > > Why not use __pci_reset_function_locked() and ensure all callers of > pcistub_put_pci_dev() are holding the device lock? That could also be done. > > > pci_restore_state(dev); > > If we didn't reset the device there is no need to restore its state. <nods> > > David _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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