[PATCH] PCI : check if type 0 devices have all BARs of size zero

[Wasim Khan]

From: Wasim Khan <wasim.k...@nxp.com>

Log a message if all BARs of type 0 devices are of
size zero. This can help detecting type 0 devices
not reporting BAR size correctly.

Signed-off-by: Wasim Khan <wasim.k...@nxp.com>
---
 drivers/pci/probe.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 953f15abc850..6438d6d56777 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -321,6 +321,7 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type 
type,
 static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
 {
        unsigned int pos, reg;
+       bool found = false;
 
        if (dev->non_compliant_bars)
                return;
@@ -333,8 +334,12 @@ static void pci_read_bases(struct pci_dev *dev, unsigned 
int howmany, int rom)
                struct resource *res = &dev->resource[pos];
                reg = PCI_BASE_ADDRESS_0 + (pos << 2);
                pos += __pci_read_base(dev, pci_bar_unknown, res, reg);
+               found |= res->flags ? 1 : 0;
        }
 
+       if (!dev->hdr_type && !found)
+               pci_info(dev, "BAR size is 0 for BAR[0..%d]\n", howmany - 1);
+
        if (rom) {
                struct resource *res = &dev->resource[PCI_ROM_RESOURCE];
                dev->rom_base_reg = rom;
-- 
2.25.1