diff options
| author | Arjan van de Ven <arjan@linux.intel.com> | 2008-12-13 09:15:27 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-02-02 09:53:22 -0800 |
| commit | ab0a73d7995504d747fcc54a5fdfebc4f498aeeb (patch) | |
| tree | 09fa149d8e5bdbcc8767d1e266f937caec39042c /kernel | |
| parent | 13d38d457e1ab3eda435239d4aad426bd2d4e0ec (diff) | |
resources: skip sanity check of busy resources
commit 3ac52669c7a24b93663acfcab606d1065ed1accd upstream.
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>
Signed-off-by: Kyle McMartin <kyle@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'kernel')
| -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 4337063663e..e633106b12f 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, |