I/O resource flags consist of I/O resource types and modifier bits. Therefore, checking I/O resource type of the flags must be performed with a bitwise operation. Fix find_next_iomem_res() and region_intersects() that simply compare the flags against a given value. Also change __request_region() to set res->flags from resource_type() and resource_ext_type() of the parent, so that children nodes will inherit the extended I/O resource type. Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Cc: Borislav Petkov <bp@xxxxxxxxx> Cc: Dan Williams <dan.j.williams@xxxxxxxxx> Cc: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> Reference: https://lkml.org/lkml/2015/12/3/582 Signed-off-by: Toshi Kani <toshi.kani@xxxxxxx> --- kernel/resource.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/kernel/resource.c b/kernel/resource.c index f150dbb..d30a175 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -358,7 +358,7 @@ static int find_next_iomem_res(struct resource *res, char *name, read_lock(&resource_lock); for (p = iomem_resource.child; p; p = next_resource(p, sibling_only)) { - if (p->flags != res->flags) + if ((p->flags & res->flags) != res->flags) continue; if (name && strcmp(p->name, name)) continue; @@ -519,7 +519,8 @@ int region_intersects(resource_size_t start, size_t size, const char *name) read_lock(&resource_lock); for (p = iomem_resource.child; p ; p = p->sibling) { - bool is_type = strcmp(p->name, name) == 0 && p->flags == flags; + bool is_type = strcmp(p->name, name) == 0 && + ((p->flags & flags) == flags); if (start >= p->start && start <= p->end) is_type ? type++ : other++; @@ -1071,7 +1072,7 @@ struct resource * __request_region(struct resource *parent, res->name = name; res->start = start; res->end = start + n - 1; - res->flags = resource_type(parent); + res->flags = resource_type(parent) | resource_ext_type(parent); res->flags |= IORESOURCE_BUSY | flags; write_lock(&resource_lock); -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>