[PATCH v4 00/10] PCI: Add and use constant PCI_STATUS_ERROR_BITS and helper pci_status_get_and_clear_errors

[Heiner Kallweit]

Several drivers have own definitions for this constant, so move it
to the PCI core. In addition in multiple places the following code
sequence is used:
1. Read PCI_STATUS
2. Mask out non-error bits
3. Action based on set error bits
4. Write back set error bits to clear them

As this is a repeated pattern, add a helper to the PCI core.

Most affected drivers are network drivers. But as it's about core
PCI functionality, I suppose the series should go through the PCI
tree.

v2:
- fix formal issue with cover letter
v3:
- fix dumb typo in patch 7
v4:
- add patches 1-3
- move new constant PCI_STATUS_ERROR_BITS to include/linux/pci.h
- small improvements in commit messages

Heiner Kallweit (10):
  net: marvell: add PCI_STATUS_SIG_TARGET_ABORT to PCI status error bits
  net: skfp: add PCI_STATUS_REC_TARGET_ABORT to PCI status error bits
  r8169: add PCI_STATUS_PARITY to PCI status error bits
  PCI: Add constant PCI_STATUS_ERROR_BITS
  PCI: Add pci_status_get_and_clear_errors
  r8169: use pci_status_get_and_clear_errors
  net: sun: use pci_status_get_and_clear_errors
  net: skfp: use new constant PCI_STATUS_ERROR_BITS
  PCI: pci-bridge-emul: Use new constant PCI_STATUS_ERROR_BITS
  sound: bt87x: use pci_status_get_and_clear_errors

 drivers/net/ethernet/marvell/skge.h       |  6 -----
 drivers/net/ethernet/marvell/sky2.h       |  6 -----
 drivers/net/ethernet/realtek/r8169_main.c | 15 +++++-------
 drivers/net/ethernet/sun/cassini.c        | 28 ++++++++-------------
 drivers/net/ethernet/sun/sungem.c         | 30 +++++++----------------
 drivers/net/fddi/skfp/drvfbi.c            |  4 +--
 drivers/net/fddi/skfp/h/skfbi.h           |  5 ----
 drivers/pci/pci-bridge-emul.c             | 14 ++---------
 drivers/pci/pci.c                         | 23 +++++++++++++++++
 include/linux/pci.h                       |  8 ++++++
 sound/pci/bt87x.c                         |  7 +-----
 11 files changed, 61 insertions(+), 85 deletions(-)

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2.25.1