iommu/vt-d: Fix signedness bug in alloc_irte()

"index" needs to be signed for the error handling to work.  I deleted a
little bit of obsolete cruft related to "index" and "start_index" as
well.

Fixes: 360eb3c5687e ('iommu/vt-d: use dedicated bitmap to track remapping entry allocation status')

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>

1 files changed, 1 insertions, 6 deletions

diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c
index f307a3fb93ce..b30b423c5aca 100644
--- a/drivers/iommu/intel_irq_remapping.c
+++ b/drivers/iommu/intel_irq_remapping.c
@@ -71,18 +71,13 @@ static int alloc_irte(struct intel_iommu *iommu, int irq, u16 count)
         struct ir_table *table = iommu->ir_table;
         struct irq_2_iommu *irq_iommu = irq_2_iommu(irq);
         struct irq_cfg *cfg = irq_get_chip_data(irq);
-        u16 index, start_index;
         unsigned int mask = 0;
         unsigned long flags;
+        int index;
 
         if (!count || !irq_iommu)
                 return -1;
 
-        /*
-         * start the IRTE search from index 0.
-         */
-        index = start_index = 0;
-
         if (count > 1) {
                 count = __roundup_pow_of_two(count);
                 mask = ilog2(count);