PCI: Always check for non-CRS response before timeout

While waiting for a device to become ready (i.e., to return a non-CRS
completion to a read of its Vendor ID), if we got a valid response to the
very last read before timing out, we printed a warning and gave up on the
device even though it was actually ready.

For a typical 60s timeout, we wait about 65s (it's not exact because of the
exponential backoff), but we treated devices that became ready between 33s
and 65s as though they failed.

Move the Device ID read later so we check whether the device is ready
before checking for a timeout.

Thanks to Sinan Kaya <okaya@codeaurora.org>, reorder reads so we always
check device presence after sleep, since it's pointless to sleep unless we
recheck afterwards.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

1 files changed, 6 insertions, 5 deletions

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index c81c9835f4c7..150093817c59 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1876,17 +1876,18 @@ bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *l,
 		if (!crs_timeout)
 			return false;
 
-		msleep(delay);
-		delay *= 2;
-		if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l))
-			return false;
-		/* Card hasn't responded in 60 seconds?  Must be stuck. */
 		if (delay > crs_timeout) {
 			printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not responding\n",
 			       pci_domain_nr(bus), bus->number, PCI_SLOT(devfn),
 			       PCI_FUNC(devfn));
 			return false;
 		}
+
+		msleep(delay);
+		delay *= 2;
+
+		if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l))
+			return false;
 	}
 
 	return true;