diff options
author | Toshi Kani <[email protected]> | 2015-07-16 17:23:16 -0600 |
---|---|---|
committer | Thomas Gleixner <[email protected]> | 2015-07-22 17:20:34 +0200 |
commit | 8c38de992be9aed0b34c4fab8f972c83d3b00dc4 (patch) | |
tree | 93b588443cee1bebc2d7c369ae1ea20303d0eebc | |
parent | 9a58eebe1ace609bedf8c5a65e70a097459f5696 (diff) |
mm: Fix bugs in region_is_ram()
region_is_ram() looks up the iomem_resource table to check if
a target range is in RAM. However, it always returns with -1
due to invalid range checks. It always breaks the loop at the
first entry of the table.
Another issue is that it compares p->flags and flags, but it always
fails. flags is declared as int, which makes it as a negative value
with IORESOURCE_BUSY (0x80000000) set while p->flags is unsigned long.
Fix the range check and flags so that region_is_ram() works as
advertised.
Signed-off-by: Toshi Kani <[email protected]>
Reviewed-by: Dan Williams <[email protected]>
Cc: Mike Travis <[email protected]>
Cc: Luis R. Rodriguez <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Roland Dreier <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>
-rw-r--r-- | kernel/resource.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/resource.c b/kernel/resource.c index 90552aab5f2d..fed052a1bc9f 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -504,13 +504,13 @@ int region_is_ram(resource_size_t start, unsigned long size) { struct resource *p; resource_size_t end = start + size - 1; - int flags = IORESOURCE_MEM | IORESOURCE_BUSY; + unsigned long flags = IORESOURCE_MEM | IORESOURCE_BUSY; const char *name = "System RAM"; int ret = -1; read_lock(&resource_lock); for (p = iomem_resource.child; p ; p = p->sibling) { - if (end < p->start) + if (p->end < start) continue; if (p->start <= start && end <= p->end) { @@ -521,7 +521,7 @@ int region_is_ram(resource_size_t start, unsigned long size) ret = 1; break; } - if (p->end < start) + if (end < p->start) break; /* not found */ } read_unlock(&resource_lock); |