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[PATCH] x86-64: Calgary IOMMU: deobfuscate calgary_init
calgary_init's for loop does not correspond to the actual device being checked, which makes its upperbound check for array overflow useless. Changing this to a do-while loop is the correct way of doing this. There should be no possibility of spinning forever in this loop, as pci_get_device states that it will go through all iterations, then return NULL (thus breaking the loop). Signed-off-by: Jon Mason <jdmason@kudzu.us> Signed-off-by: Muli Ben-Yehuda <muli@il.ibm.com> Signed-off-by: Andi Kleen <ak@suse.de>
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@ -816,6 +816,8 @@ static int __init calgary_init_one(struct pci_dev *dev)
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void __iomem *bbar;
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int ret;
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BUG_ON(dev->bus->number >= MAX_PHB_BUS_NUM);
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address = locate_register_space(dev);
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/* map entire 1MB of Calgary config space */
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bbar = ioremap_nocache(address, 1024 * 1024);
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@ -842,10 +844,10 @@ done:
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static int __init calgary_init(void)
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{
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int i, ret = -ENODEV;
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int ret = -ENODEV;
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struct pci_dev *dev = NULL;
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for (i = 0; i < MAX_PHB_BUS_NUM; i++) {
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do {
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dev = pci_get_device(PCI_VENDOR_ID_IBM,
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PCI_DEVICE_ID_IBM_CALGARY,
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dev);
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@ -861,12 +863,12 @@ static int __init calgary_init(void)
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ret = calgary_init_one(dev);
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if (ret)
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goto error;
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}
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} while (1);
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return ret;
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error:
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for (i--; i >= 0; i--) {
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do {
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dev = pci_find_device_reverse(PCI_VENDOR_ID_IBM,
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PCI_DEVICE_ID_IBM_CALGARY,
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dev);
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@ -882,7 +884,7 @@ error:
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calgary_disable_translation(dev);
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calgary_free_bus(dev);
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pci_dev_put(dev); /* Undo calgary_init_one()'s pci_dev_get() */
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}
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} while (1);
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return ret;
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}
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