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| author | Arjan van de Ven <arjan@linux.intel.com> | 2008-12-13 09:15:27 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-12-16 23:30:49 +0100 |
| commit | 3ac52669c7a24b93663acfcab606d1065ed1accd (patch) | |
| tree | d71baaa46f0d443176d2f161d10885d916a5c7e8 /kernel/resource.c | |
| parent | 1bda71282ded6a2e09a2db7c8884542fb46bfd4f (diff) | |
| download | lwn-3ac52669c7a24b93663acfcab606d1065ed1accd.tar.gz lwn-3ac52669c7a24b93663acfcab606d1065ed1accd.zip | |
resources: skip sanity check of busy resources
Impact: reduce false positives in iomem_map_sanity_check()
Some drivers (vesafb) only map/reserve a portion of a resource.
If then some other driver comes in and maps the whole resource,
the current code WARN_ON's. This is not the intent of the checks
in iomem_map_sanity_check(); rather these checks want to
warn when crossing *hardware* resources only.
This patch skips BUSY resources as suggested by Linus.
Note: having two drivers talk to the same hardware at the same
time is obviously not optimal behavior, but that's a separate story.
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/resource.c')
| -rw-r--r-- | kernel/resource.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/kernel/resource.c b/kernel/resource.c index 4337063663ef..e633106b12f6 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -853,6 +853,15 @@ int iomem_map_sanity_check(resource_size_t addr, unsigned long size) if (PFN_DOWN(p->start) <= PFN_DOWN(addr) && PFN_DOWN(p->end) >= PFN_DOWN(addr + size - 1)) continue; + /* + * if a resource is "BUSY", it's not a hardware resource + * but a driver mapping of such a resource; we don't want + * to warn for those; some drivers legitimately map only + * partial hardware resources. (example: vesafb) + */ + if (p->flags & IORESOURCE_BUSY) + continue; + printk(KERN_WARNING "resource map sanity check conflict: " "0x%llx 0x%llx 0x%llx 0x%llx %s\n", (unsigned long long)addr, |