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device-dax: Avoid an unnecessary check in alloc_dev_dax_range()

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Swap the calling sequence of krealloc() and __request_region(), call the
latter first. In this way, the value of dev_dax->nr_range does not need to
be considered when __request_region() failed.

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Link: https://lore.kernel.org/r/20201219081840.1149-2-thunder.leizhen@huawei.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Zhen Lei 2020-12-19 16:18:40 +08:00 committed by Dan Williams
parent 6268d7da4d
commit ff8da37d3d
1 changed files with 6 additions and 14 deletions
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20
drivers/dax/bus.c
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@ -772,22 +772,14 @@ static int alloc_dev_dax_range(struct dev_dax *dev_dax, u64 start,
return 0;
}
ranges = krealloc(dev_dax->ranges, sizeof(*ranges)
* (dev_dax->nr_range + 1), GFP_KERNEL);
if (!ranges)
alloc = __request_region(res, start, size, dev_name(dev), 0);
if (!alloc)
return -ENOMEM;
alloc = __request_region(res, start, size, dev_name(dev), 0);
if (!alloc) {
/*
* If this was an empty set of ranges nothing else
* will release @ranges, so do it now.
*/
if (!dev_dax->nr_range) {
kfree(ranges);
ranges = NULL;
}
dev_dax->ranges = ranges;
ranges = krealloc(dev_dax->ranges, sizeof(*ranges)
* (dev_dax->nr_range + 1), GFP_KERNEL);
if (!ranges) {
__release_region(res, alloc->start, resource_size(alloc));
return -ENOMEM;
}