From: Zhen Lei <thunder.leizhen@huawei.com>
To: Oliver O'Halloran <oohall@gmail.com>,
Dan Williams <dan.j.williams@intel.com>,
Vishal Verma <vishal.l.verma@intel.com>,
"Dave Jiang" <dave.jiang@intel.com>,
Ira Weiny <ira.weiny@intel.com>,
Markus Elfring <Markus.Elfring@web.de>,
linux-nvdimm <linux-nvdimm@lists.01.org>,
linux-kernel <linux-kernel@vger.kernel.org>
Cc: Zhen Lei <thunder.leizhen@huawei.com>
Subject: [PATCH v3 7/7] libnvdimm: slightly simplify available_slots_show()
Date: Thu, 20 Aug 2020 10:16:41 +0800 [thread overview]
Message-ID: <20200820021641.3188-8-thunder.leizhen@huawei.com> (raw)
In-Reply-To: <20200820021641.3188-1-thunder.leizhen@huawei.com>
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);
--
1.8.3
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next prev parent reply other threads:[~2020-08-20 2:17 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-20 2:16 [PATCH v3 0/7] bugfix and optimize for drivers/nvdimm Zhen Lei
2020-08-20 2:16 ` [PATCH v3 1/7] libnvdimm: fix memory leaks in of_pmem.c Zhen Lei
2020-08-20 2:16 ` [PATCH v3 2/7] libnvdimm: add sanity check for provider_name in of_pmem_region_probe() Zhen Lei
2020-08-20 2:16 ` [PATCH v3 3/7] libnvdimm: simplify walk_to_nvdimm_bus() Zhen Lei
2020-08-20 2:16 ` [PATCH v3 4/7] libnvdimm: reduce an unnecessary if branch in nd_region_create() Zhen Lei
2020-08-20 2:16 ` [PATCH v3 5/7] libnvdimm: reduce an unnecessary if branch in nd_region_activate() Zhen Lei
2020-08-27 7:04 ` Leizhen (ThunderTown)
2020-08-20 2:16 ` [PATCH v3 6/7] libnvdimm: make sure EXPORT_SYMBOL_GPL(nvdimm_flush) close to its function Zhen Lei
2020-08-20 11:05 ` Pankaj Gupta
2020-08-20 2:16 ` Zhen Lei [this message]
2020-08-21 12:56 ` [PATCH v3 7/7] libnvdimm: slightly simplify available_slots_show() Salih Agenter
2020-08-27 6:35 ` [PATCH v3 0/7] bugfix and optimize for drivers/nvdimm Leizhen (ThunderTown)
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