On Wed, 2019-09-25 at 11:10 -0700, ira.weiny@xxxxxxxxx wrote:
> From: Ira Weiny <ira.weiny@xxxxxxxxx>
>
> Don't leave claim_class set to an invalid value if an error occurs in
> btt_claim_class().
>
> While we are here change the return type of __holder_class_store() to be
> clear about the values it is returning.
>
> This was found via code inspection.
>
> Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx>
> ---
> drivers/nvdimm/namespace_devs.c | 19 +++++++++----------
> 1 file changed, 9 insertions(+), 10 deletions(-)
One minor nit below, but otherwise it looks good to me:
Reviewed-by: Vishal Verma <vishal.l.verma@xxxxxxxxx>
>
> diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
> index 5b22cecefc99..a020c166e1e7 100644
> --- a/drivers/nvdimm/namespace_devs.c
> +++ b/drivers/nvdimm/namespace_devs.c
> @@ -1510,16 +1510,19 @@ static ssize_t holder_show(struct device *dev,
> }
> static DEVICE_ATTR_RO(holder);
>
> -static ssize_t __holder_class_store(struct device *dev, const char *buf)
> +static int __holder_class_store(struct device *dev, const char *buf)
> {
> struct nd_namespace_common *ndns = to_ndns(dev);
>
> if (dev->driver || ndns->claim)
> return -EBUSY;
>
> - if (sysfs_streq(buf, "btt"))
> - ndns->claim_class = btt_claim_class(dev);
> - else if (sysfs_streq(buf, "pfn"))
> + if (sysfs_streq(buf, "btt")) {
> + int rc = btt_claim_class(dev);
Need a blank line here separating variable declarations and code.
> + if (rc < NVDIMM_CCLASS_NONE)
> + return rc;
> + ndns->claim_class = rc;
> + } else if (sysfs_streq(buf, "pfn"))
> ndns->claim_class = NVDIMM_CCLASS_PFN;
> else if (sysfs_streq(buf, "dax"))
> ndns->claim_class = NVDIMM_CCLASS_DAX;
> @@ -1528,10 +1531,6 @@ static ssize_t __holder_class_store(struct device *dev, const char *buf)
> else
> return -EINVAL;
>
> - /* btt_claim_class() could've returned an error */
> - if ((int)ndns->claim_class < 0)
> - return ndns->claim_class;
> -
> return 0;
> }
>
> @@ -1539,7 +1538,7 @@ static ssize_t holder_class_store(struct device *dev,
> struct device_attribute *attr, const char *buf, size_t len)
> {
> struct nd_region *nd_region = to_nd_region(dev->parent);
> - ssize_t rc;
> + int rc;
>
> nd_device_lock(dev);
> nvdimm_bus_lock(dev);
> @@ -1547,7 +1546,7 @@ static ssize_t holder_class_store(struct device *dev,
> rc = __holder_class_store(dev, buf);
> if (rc >= 0)
> rc = nd_namespace_label_update(nd_region, dev);
> - dev_dbg(dev, "%s(%zd)\n", rc < 0 ? "fail " : "", rc);
> + dev_dbg(dev, "%s(%d)\n", rc < 0 ? "fail " : "", rc);
> nvdimm_bus_unlock(dev);
> nd_device_unlock(dev);
>
