[ 060/135] iommu/arm-smmu: fix a signedness bug

[Greg Kroah-Hartman]

3.11-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

commit faea13b72dbdb77e4d6ad83344596486611708b0 upstream.

Unsigned char is never equal to -1.

Tested-by: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/iommu/arm-smmu.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -379,6 +379,7 @@ struct arm_smmu_cfg {
 	u32				cbar;
 	pgd_t				*pgd;
 };
+#define INVALID_IRPTNDX			0xff
 
 struct arm_smmu_domain {
 	/*
@@ -830,7 +831,7 @@ static int arm_smmu_init_domain_context(
 	if (IS_ERR_VALUE(ret)) {
 		dev_err(smmu->dev, "failed to request context IRQ %d (%u)\n",
 			root_cfg->irptndx, irq);
-		root_cfg->irptndx = -1;
+		root_cfg->irptndx = INVALID_IRPTNDX;
 		goto out_free_context;
 	}
 
@@ -855,7 +856,7 @@ static void arm_smmu_destroy_domain_cont
 	if (!smmu)
 		return;
 
-	if (root_cfg->irptndx != -1) {
+	if (root_cfg->irptndx != INVALID_IRPTNDX) {
 		irq = smmu->irqs[smmu->num_global_irqs + root_cfg->irptndx];
 		free_irq(irq, domain);
 	}


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