hisi_acc_vfio_pci: fix NULL dereference in reset_prepare on PF passthrough

When a PF is bound to the driver via driver_override and passed
through to a VM, its pf_qm stays NULL. The PCI error handler
reset_prepare() runs during open_device through
pci_try_reset_function(), before the mig_ops gate, and dereferences
the NULL pf_qm for the timeout log, crashing the kernel.

Move the mig_ops check to the entry of reset_prepare() and
aer_reset_done() so non-migration devices skip the QM_RESETTING
coordination. The dev local resolved &qm->pdev->dev before the
gate, so open code it at the dev_err() call where qm is known
valid. Also clear set_reset_flag together with QM_RESETTING in
aer_reset_done(); the flag was never cleared before, so a later
timed-out reset could release a foreign lock.

Fixes: b0eed085903e ("hisi_acc_vfio_pci: Add support for VFIO live migration")
Fixes: a22099ed7936f ("hisi_acc_vfio_pci: fix VF reset timeout issue")
Signed-off-by: Longfang Liu <liulongfang@huawei.com>
Link: https://lore.kernel.org/r/20261013071929.3988687-2-liulongfang@huawei.com
Signed-off-by: Alex Williamson <alex@shazbot.org>

0 files changed, 0 insertions, 0 deletions