[PATCH v3 7/7] libnvdimm: slightly simplify available_slots_show()

Zhen Lei
2020-08-20T02:17:39Z

The type of "nfree" is u32, so "nfree - 1" can only be overflowed when
"nfree" is zero. Replace "if (nfree - 1 > nfree)" with "if (nfree == 0)"
seems more clear. And remove the assignment "nfree = 0", no need for it.

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
---
drivers/nvdimm/dimm_devs.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
index 61374def515552f..bf7d0cdc147cb39 100644
--- a/drivers/nvdimm/dimm_devs.c
+++ b/drivers/nvdimm/dimm_devs.c
@@ -347,10 +347,9 @@ static ssize_t available_slots_show(struct device *dev,

nvdimm_bus_lock(dev);
nfree = nd_label_nfree(ndd);
- if (nfree - 1 > nfree) {
+ if (nfree == 0)
dev_WARN_ONCE(dev, 1, "we ate our last label?\n");
- nfree = 0;
- } else
+ else
nfree--;
rc = sprintf(buf, "%d\n", nfree);
nvdimm_bus_unlock(dev);