Re: [PATCH 0/3] pci-hyperv: fix memory leak and add pci_destroy_slot()

From: Stephen Hemminger
Date: Tue Mar 05 2019 - 13:27:58 EST

On Mon, 4 Mar 2019 21:34:47 +0000
Dexuan Cui <decui@xxxxxxxxxxxxx> wrote:

> Patch #1 fixes a memory leak caused by incorrectly-maintained hpdev->refs.
> Patch #2 and #3 make sure the "slot" is removed in all the scenarios.
> Without them, in the quick hot-add/hot-remove test, systemd-dev may easily
> crash when trying to access a dangling sys file in /sys/bus/pci/slots/:
> "BUG: unable to handle kernel paging request".
> BTW, Patch #2 was posted on Feb 7, 2019, and this is the v2: the change
> to hv_eject_device_work() in v1 is removed, as the change is only needed
> when we hot-remove the device and remove the pci-hyperv driver at the
> same time. It looks more work is required to make this scenaro work
> correctly, and since removing the driver is not really a "usual" usage,
> we can address this scenario in the future.
> Please review the patchset.
> Dexuan Cui (3):
> PCI: hv: Fix a memory leak in hv_eject_device_work()
> PCI: hv: Add hv_pci_remove_slots() when we unload the driver
> PCI: hv: Add pci_destroy_slot() in pci_devices_present_work(), if
> necessary
> drivers/pci/controller/pci-hyperv.c | 23 +++++++++++++++++++++++
> 1 file changed, 23 insertions(+)

Thanks for fixing this.

Reviewed-by: Stephen Hemminger <stephen@xxxxxxxxxxxxxxxxxx>