[PATCH] x86:sysfb_efi:efifb_set_system: fix miss valid address range in later BARs

[Wang YanQing <udknight@gmail.com>]

We can't just break out when meet start is equal to zero,
this will cause we miss valid address range in later BARs.

On the other hand, it isn't enough to test start only
for below situation:
0(start) <= lfb_base < end

Signed-off-by: Wang YanQing <udknight@gmail.com>
---
 arch/x86/kernel/sysfb_efi.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/sysfb_efi.c b/arch/x86/kernel/sysfb_efi.c
index b285d4e..ac0b521 100644
--- a/arch/x86/kernel/sysfb_efi.c
+++ b/arch/x86/kernel/sysfb_efi.c
@@ -106,10 +106,19 @@ static int __init efifb_set_system(const struct dmi_system_id *id)
 					continue;
 				for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 					resource_size_t start, end;
+					unsigned long flags;
+
+					flags = pci_resource_flags(dev, i);
+					if (!(flags & IORESOURCE_MEM))
+						continue;
+
+					if (flags & IORESOURCE_UNSET)
+						continue;
+
+					if (pci_resource_len(dev, i) == 0)
+						continue;
 
 					start = pci_resource_start(dev, i);
-					if (start == 0)
-						break;
 					end = pci_resource_end(dev, i);
 					if (screen_info.lfb_base >= start &&
 					    screen_info.lfb_base < end) {
-- 
1.8.5.6.2.g3d8a54e.dirty