PCI: Protect pci_error_handlers->reset_notify() usage with device_lock()

PCI: Protect pci_error_handlers->reset_notify() usage with device_lock()

Every method in struct device_driver or structures derived from it like
struct pci_driver MUST provide exclusion vs the driver's ->remove() method,
usually by using device_lock().

Protect use of pci_error_handlers->reset_notify() by holding the device
lock while calling it.

Note:

  - pci_dev_lock() calls device_lock() in addition to blocking user-space
    config accesses.

  - pci_err_handlers->reset_notify() is used inside
    pci_dev_save_and_disable() and pci_dev_restore().  We could hold the
    device lock directly in pci_reset_notify(), but we expand the region
    since we have several calls following each other.

Without this, ->reset_notify() may race with ->remove() calls, which can be
easily triggered in NVMe.

[bhelgaas: changelog, add pci_reset_notify() comment]
[bhelgaas: fold in fix from Dan Carpenter <[email protected]>:
http://lkml.kernel.org/r/20170701135323.x5vaj4e2wcs2mcro@mwanda]
Link: http://lkml.kernel.org/r/[email protected]
Reported-by: Rakesh Pandit <[email protected]>
Tested-by: Rakesh Pandit <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>