> -----Original Message----- > From: Dexuan Cui > Sent: Tuesday, March 6, 2018 10:22 AM > To: [email protected]; [email protected]; KY Srinivasan > <[email protected]>; > Stephen Hemminger <[email protected]>; [email protected]; > [email protected]; > [email protected] > Cc: [email protected]; [email protected]; > Haiyang Zhang > <[email protected]>; [email protected]; [email protected]; > Michael > Kelley (EOSG) <[email protected]>; Dexuan Cui > <[email protected]>; Jack > Morgenstein <[email protected]>; [email protected] > 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 <[email protected]> > Tested-by: Adrian Suhov <[email protected]> > Tested-by: Chris Valean <[email protected]> > Cc: Vitaly Kuznetsov <[email protected]> > Cc: Jack Morgenstein <[email protected]> > Cc: [email protected] > Cc: Stephen Hemminger <[email protected]> > Cc: K. Y. Srinivasan <[email protected]> > --- > drivers/pci/host/pci-hyperv.c | 17 ++++++++++++++--- > 1 file changed, 14 insertions(+), 3 deletions(-) >
Reviewed-by: Michael Kelley <[email protected]> _______________________________________________ devel mailing list [email protected] http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
