> -----Original Message----- > From: Dexuan Cui > Sent: Tuesday, March 6, 2018 10:22 AM > To: bhelg...@google.com; linux-...@vger.kernel.org; KY Srinivasan > <k...@microsoft.com>; > Stephen Hemminger <sthem...@microsoft.com>; o...@aepfle.de; > a...@canonical.com; > jasow...@redhat.com > Cc: linux-ker...@vger.kernel.org; driverdev-devel@linuxdriverproject.org; > Haiyang Zhang > <haiya...@microsoft.com>; vkuzn...@redhat.com; marcelo.ce...@canonical.com; > Michael > Kelley (EOSG) <michael.h.kel...@microsoft.com>; Dexuan Cui > <de...@microsoft.com>; Jack > Morgenstein <ja...@mellanox.com>; sta...@vger.kernel.org > Subject: [PATCH v3 3/6] PCI: hv: serialize the present/eject work items > > When we hot-remove the device, we first receive a PCI_EJECT message and > then receive a PCI_BUS_RELATIONS message with bus_rel->device_count == 0. > > The first message is offloaded to hv_eject_device_work(), and the second > is offloaded to pci_devices_present_work(). Both the paths can be running > list_del(&hpdev->list_entry), causing general protection fault, because > system_wq can run them concurrently. > > The patch eliminates the race condition. > > Signed-off-by: Dexuan Cui <de...@microsoft.com> > Tested-by: Adrian Suhov <v-ads...@microsoft.com> > Tested-by: Chris Valean <v-chv...@microsoft.com> > Cc: Vitaly Kuznetsov <vkuzn...@redhat.com> > Cc: Jack Morgenstein <ja...@mellanox.com> > Cc: sta...@vger.kernel.org > Cc: Stephen Hemminger <sthem...@microsoft.com> > Cc: K. Y. Srinivasan <k...@microsoft.com> > --- > drivers/pci/host/pci-hyperv.c | 17 ++++++++++++++--- > 1 file changed, 14 insertions(+), 3 deletions(-) >
Reviewed-by: Michael Kelley <mikel...@microsoft.com> _______________________________________________ devel mailing list de...@linuxdriverproject.org http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
