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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: 360eb3c568 ('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>
This commit is contained in:
Dan Carpenter 2014-01-09 08:32:36 +03:00 committed by Joerg Roedel
parent 9bdc531ec6
commit 9f4c7448f4
1 changed files with 1 additions and 6 deletions
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7
drivers/iommu/intel_irq_remapping.c
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@ -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);