| Message ID | 20200820021641.3188-8-thunder.leizhen@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | bugfix and optimize for drivers/nvdimm | expand |
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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);
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(-)