diff options
Diffstat (limited to 'drivers/ata/ahci.c')
| -rw-r--r-- | drivers/ata/ahci.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c index 1d73a53370cf..b4e5d347151a 100644 --- a/drivers/ata/ahci.c +++ b/drivers/ata/ahci.c @@ -1888,6 +1888,24 @@ static ssize_t remapped_nvme_show(struct device *dev, static DEVICE_ATTR_RO(remapped_nvme); +static int ahci_validate_bar_size(struct pci_dev *pdev, int bar, + struct ahci_host_priv *hpriv) +{ + u32 cap = readl(hpriv->mmio + HOST_CAP); + unsigned int max_ports = ahci_nr_ports(cap); + u32 last_port_end = 0x100 + (max_ports * 0x80); + resource_size_t bar_size = pci_resource_len(pdev, bar); + + if (last_port_end > bar_size) { + dev_warn(&pdev->dev, + "BAR%d too small for %u ports (last port ends at %#x, BAR %pa)\n", + bar, max_ports, last_port_end, &bar_size); + return -ENODEV; + } + + return 0; +} + static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) { unsigned int board_id = ent->driver_data; @@ -1988,6 +2006,10 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) if (!hpriv->mmio) return -ENOMEM; + rc = ahci_validate_bar_size(pdev, ahci_pci_bar, hpriv); + if (rc) + return rc; + /* detect remapped nvme devices */ ahci_remap_check(pdev, ahci_pci_bar, hpriv); |