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| author | Ben Collins <ben.collins@ubuntu.com> | 2007-05-23 13:57:43 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-23 20:14:12 -0700 |
| commit | 3c6df2a9177c010bf811c361149069e4bfd9bb11 (patch) | |
| tree | 151ece2576e9e2481057bc0107aba8c0cc864384 | |
| parent | 6754bb4de94098a0aaa23a600f0edb9a9454c252 (diff) | |
| download | lwn-3c6df2a9177c010bf811c361149069e4bfd9bb11.tar.gz lwn-3c6df2a9177c010bf811c361149069e4bfd9bb11.zip | |
Avoid zero size allocation in cache_k8_northbridges()
kmalloc for flush_words resulted in zero size allocation when no
k8_northbridges existed. Short circuit the code path for this case.
Also remove uneeded zeroing of num_k8_northbridges just after checking if
it is zero.
Signed-off-by: Ben Collins <bcollins@ubuntu.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Dave Jones <davej@codemonkey.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | arch/x86_64/kernel/k8.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/x86_64/kernel/k8.c b/arch/x86_64/kernel/k8.c index bc11b32e8b4d..7377ccb21335 100644 --- a/arch/x86_64/kernel/k8.c +++ b/arch/x86_64/kernel/k8.c @@ -39,10 +39,10 @@ int cache_k8_northbridges(void) { int i; struct pci_dev *dev; + if (num_k8_northbridges) return 0; - num_k8_northbridges = 0; dev = NULL; while ((dev = next_k8_northbridge(dev)) != NULL) num_k8_northbridges++; @@ -52,6 +52,11 @@ int cache_k8_northbridges(void) if (!k8_northbridges) return -ENOMEM; + if (!num_k8_northbridges) { + k8_northbridges[0] = NULL; + return 0; + } + flush_words = kmalloc(num_k8_northbridges * sizeof(u32), GFP_KERNEL); if (!flush_words) { kfree(k8_northbridges); |