On 10/15/19 3:54 PM, Dan Williams wrote:

Commit c312ef176399 "libata/ahci: Drop PCS quirk for Denverton and beyond" got the polarity wrong on the check for which board-ids should have the quirk applied. The board type board_ahci_pcs7 is defined at the end of the list such that "pcs7" boards can be special cased in the future if they need the quirk. All prior Intel board ids "< board_ahci_pcs7" should proceed with applying the quirk.

Reported-by: Andreas Friedrich afrie@gmx.net Reported-by: Stephen Douthit stephend@silicom-usa.com Fixes: c312ef176399 ("libata/ahci: Drop PCS quirk for Denverton and beyond") Cc: stable@vger.kernel.org Signed-off-by: Dan Williams dan.j.williams@intel.com

---

drivers/ata/ahci.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c index dd92faf197d5..05c2b32dcc4d 100644 --- a/drivers/ata/ahci.c +++ b/drivers/ata/ahci.c @@ -1600,7 +1600,9 @@ static void ahci_intel_pcs_quirk(struct pci_dev *pdev, struct ahci_host_priv *hp */ if (!id || id->vendor != PCI_VENDOR_ID_INTEL) return;

Unless I'm missing something this will short-circuit if there are any older Intel controllers not explicitly listed with a PCI_VDEVICE entry in ahci_pci_tbl. Those will match on:

/* Generic, PCI class code for AHCI */ { PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_SATA_AHCI, 0xffffff, board_ahci },

and id->vendor will be PCI_ANY_ID so we bail before applying the quirk. because....

static inline const struct pci_device_id * pci_match_one_device(const struct pci_device_id *id, const struct pci_dev *dev) { if ((id->vendor == PCI_ANY_ID || id->vendor == dev->vendor) && (id->device == PCI_ANY_ID || id->device == dev->device) && (id->subvendor == PCI_ANY_ID || id->subvendor == dev->subsystem_vendor) && (id->subdevice == PCI_ANY_ID || id->subdevice == dev->subsystem_device) && !((id->class ^ dev->class) & id->class_mask)) return id; return NULL; }

const struct pci_device_id *pci_match_id(const struct pci_device_id *ids, struct pci_dev *dev) { if (ids) { while (ids->vendor || ids->subvendor || ids->class_mask) { if (pci_match_one_device(ids, dev)) return ids; ids++; } } return NULL; }

So we should check pdev->vendor instead.

-Steve

• if (((enum board_ids) id->driver_data) < board_ahci_pcs7)

• /* Skip applying the quirk on Denverton and beyond */
• if (((enum board_ids) id->driver_data) >= board_ahci_pcs7) return;

/*