Aug 17 2016

powerpc/powernv/pci: fix iterator signedness 

Author: Andrzej Hajda <a.hajda@samsung.com>

Unsigned type is always non-negative, so the loop could not end in case
condition is never true.

The problem has been detected using semantic patch
scripts/coccinelle/tests/unsigned_lesser_than_zero.cocci

Signed-off-by: Andrzej Hajda 
Signed-off-by: Benjamin Herrenschmidt 

---
 arch/powerpc/platforms/powernv/pci-ioda.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
 
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index fd9444f..1321826 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -149,7 +149,7 @@ static void pnv_ioda_reserve_pe(struct pnv_phb *phb, int pe_no)
 
 static struct pnv_ioda_pe *pnv_ioda_alloc_pe(struct pnv_phb *phb)
 {
-	unsigned long pe = phb->ioda.total_pe_num - 1;
+	long pe;
 
 	for (pe = phb->ioda.total_pe_num - 1; pe >= 0; pe--) {
 		if (!test_and_set_bit(pe, phb->ioda.pe_alloc))

qlambert