diff options
| author | Jon Mason <jdmason@kudzu.us> | 2006-10-05 18:47:21 +0200 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2006-10-05 18:47:21 +0200 |
| commit | dedc9937e876cb5430bca6a1dccfcc2ff22f8b7c (patch) | |
| tree | befdff79af02b30ba42cfdb983343ea7ec7b363f /arch/x86_64/kernel | |
| parent | [PATCH] i386: Update defconfig (diff) | |
| download | linux-dedc9937e876cb5430bca6a1dccfcc2ff22f8b7c.tar.xz linux-dedc9937e876cb5430bca6a1dccfcc2ff22f8b7c.zip | |
[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>
Diffstat (limited to 'arch/x86_64/kernel')
| -rw-r--r-- | arch/x86_64/kernel/pci-calgary.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/arch/x86_64/kernel/pci-calgary.c b/arch/x86_64/kernel/pci-calgary.c index f760045d6d35..1100031528dc 100644 --- a/arch/x86_64/kernel/pci-calgary.c +++ b/arch/x86_64/kernel/pci-calgary.c @@ -816,6 +816,8 @@ static int __init calgary_init_one(struct pci_dev *dev) void __iomem *bbar; int ret; + BUG_ON(dev->bus->number >= MAX_PHB_BUS_NUM); + address = locate_register_space(dev); /* map entire 1MB of Calgary config space */ bbar = ioremap_nocache(address, 1024 * 1024); @@ -842,10 +844,10 @@ done: static int __init calgary_init(void) { - int i, ret = -ENODEV; + int ret = -ENODEV; struct pci_dev *dev = NULL; - for (i = 0; i < MAX_PHB_BUS_NUM; i++) { + do { dev = pci_get_device(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CALGARY, dev); @@ -861,12 +863,12 @@ static int __init calgary_init(void) ret = calgary_init_one(dev); if (ret) goto error; - } + } while (1); return ret; error: - for (i--; i >= 0; i--) { + do { dev = pci_find_device_reverse(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CALGARY, dev); @@ -882,7 +884,7 @@ error: calgary_disable_translation(dev); calgary_free_bus(dev); pci_dev_put(dev); /* Undo calgary_init_one()'s pci_dev_get() */ - } + } while (1); return ret; } |