Many multi-function devices provide shared registers in extended config space for accessing VPD. The behavior of these registers means that the state must be tracked and access locked correctly for accesses not to hang or worse. One way to meet these needs is to always perform the accesses through function 0, thereby using the state tracking and mutex that already exists. To provide this behavior, add a dev_flags bit to indicate that this should be done. This bit can then be set for any non-zero function that needs to redirect such VPD access to function 0. Do not set this bit on the zero function or there will be an infinite recursion. The second patch uses this new flag to invoke this behavior on all multi-function Intel Ethernet devices. Signed-off-by: Mark Rustad <mark.d.rustad@xxxxxxxxx> --- Changes in V2: - Corrected a spelling error in a log message - Added checks to see that the referenced function 0 is reasonable Changes in V3: - Don't leak a device reference - Check that function 0 has VPD - Make a helper for the function 0 checks - Moved a multifunction check to the quirk patch --- Mark D Rustad (2): pci: Add dev_flags bit to access VPD through function 0 pci: Add VPD quirk for Intel Ethernet devices drivers/pci/access.c | 61 +++++++++++++++++++++++++++++++++++++++++++++++++- drivers/pci/quirks.c | 9 +++++++ 2 files changed, 69 insertions(+), 1 deletion(-) -- Mark Rustad, Network Division, Intel Corporation -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html