[PATCH] PCI: disable auto realloc detection for lsi devices

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LSI cards do not work if pci core change pci bar vaules.
will need to disable/enable pcie link of bridge manually.

So disable auto realloc if there is any lsi device on that pci root
bus.

If BIOS is broken, solution would be booting pci=realloc and
1. check with lsi to get new hba firmware to handle BAR changing.
2. or disable/enable pcie link manually to get firmare reset.

Need to backport to kernel before 3.12 as this one can not be
applied directly.

Reported-by: Paul Johnson <pjay@xxxxxxxxxxx>
Tested-by: Paul Johnson <pjay@xxxxxxxxxxx>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=92351
Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
Cc: 3.12+ <stable@xxxxxxxxxxxxxxx> # 3.12+

---
 drivers/pci/setup-bus.c |   17 +++++++++++++++++
 1 file changed, 17 insertions(+)

Index: linux-2.6/drivers/pci/setup-bus.c
===================================================================
--- linux-2.6.orig/drivers/pci/setup-bus.c
+++ linux-2.6/drivers/pci/setup-bus.c
@@ -1548,14 +1548,31 @@ static int iov_resources_unassigned(stru
 	return 0;
 }
 
+static int strange_dev_check(struct pci_dev *dev, void *data)
+{
+	bool *found = data;
+
+	/* LSI device firmware is not happy with changing BAR value */
+	if (dev->vendor == PCI_VENDOR_ID_LSI_LOGIC) {
+		*found = true;
+		return 1; /* return early from pci_walk_bus() */
+	}
+
+	return 0;
+}
 static enum enable_type pci_realloc_detect(struct pci_bus *bus,
 			 enum enable_type enable_local)
 {
 	bool unassigned = false;
+	bool found = false;
 
 	if (enable_local != undefined)
 		return enable_local;
 
+	pci_walk_bus(bus, strange_dev_check, &found);
+	if (found)
+		return enable_local;
+
 	pci_walk_bus(bus, iov_resources_unassigned, &unassigned);
 	if (unassigned)
 		return auto_enabled;
--
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