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iommu/arm-smmu: fix a signedness bug

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Unsigned char is never equal to -1.

Cc: <stable@vger.kernel.org>
Tested-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Dan Carpenter 2013-08-21 09:33:30 +01:00 committed by Will Deacon
parent 272b98c645
commit faea13b72d
1 changed files with 3 additions and 2 deletions
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5
drivers/iommu/arm-smmu.c
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@ -377,6 +377,7 @@ struct arm_smmu_cfg {
u32 cbar;
pgd_t *pgd;
};
#define INVALID_IRPTNDX 0xff
#define ARM_SMMU_CB_ASID(cfg) ((cfg)->cbndx)
#define ARM_SMMU_CB_VMID(cfg) ((cfg)->cbndx + 1)
@ -840,7 +841,7 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain,
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;
}
@ -869,7 +870,7 @@ static void arm_smmu_destroy_domain_context(struct iommu_domain *domain)
writel_relaxed(0, cb_base + ARM_SMMU_CB_SCTLR);
arm_smmu_tlb_inv_context(root_cfg);
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);
}