From ff8da37d3d8d438ded5a4841d979899269b94d0d Mon Sep 17 00:00:00 2001
From: Zhen Lei <thunder.leizhen@huawei.com>
Date: Sat, 19 Dec 2020 16:18:40 +0800
Subject: [PATCH] device-dax: Avoid an unnecessary check in
alloc_dev_dax_range()
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>
---
drivers/dax/bus.c | 20 ++++++--------------
1 file changed, 6 insertions(+), 14 deletions(-)
diff --git a/drivers/dax/bus.c b/drivers/dax/bus.c
index 720cd140209f2..737b207c9e30d 100644
--- a/drivers/dax/bus.c
+++ b/drivers/dax/bus.c
@@ -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;
}
--
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