From: Ira Weiny <ira.weiny@intel.com>
To: Christoph Hellwig <hch@lst.de>, Dan Williams <dan.j.williams@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>,
Jens Axboe <axboe@kernel.dk>,
Vishal Verma <vishal.l.verma@intel.com>,
Dave Jiang <dave.jiang@intel.com>,
linux-block@vger.kernel.org, nvdimm@lists.linux.dev
Subject: Re: [PATCH 2/3] nvdimm/pmem: move dax_attribute_group from dax to pmem
Date: Mon, 20 Sep 2021 15:51:25 -0700 [thread overview]
Message-ID: <20210920225125.GY3169279@iweiny-DESK2.sc.intel.com> (raw)
In-Reply-To: <20210920072726.1159572-3-hch@lst.de>
On Mon, Sep 20, 2021 at 09:27:25AM +0200, Christoph Hellwig wrote:
...
> diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
> index ef4950f808326..bbeb3f46db157 100644
> --- a/drivers/nvdimm/pmem.c
> +++ b/drivers/nvdimm/pmem.c
> @@ -328,6 +328,49 @@ static const struct dax_operations pmem_dax_ops = {
> .zero_page_range = pmem_dax_zero_page_range,
> };
>
> +static ssize_t write_cache_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct pmem_device *pmem = dev_to_disk(dev)->private_data;
I want to say this should be dax_get_private()... However, looking at the use
of dax_get_private() not a single caller checks for NULL! :-(
So now I wonder why dax_get_private() exists... :-/
A quick history search does not make anything apparent. When the DAXDEV_ALIVE
check was added to dax_get_private() no callers were changed to account for a
potential NULL return.
Dan?
> +
> + return sprintf(buf, "%d\n", !!dax_write_cache_enabled(pmem->dax_dev));
> +}
> +
> +static ssize_t write_cache_store(struct device *dev,
> + struct device_attribute *attr, const char *buf, size_t len)
> +{
> + struct pmem_device *pmem = dev_to_disk(dev)->private_data;
Same here...
Ira
next prev parent reply other threads:[~2021-09-20 22:53 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-20 7:27 fix a dax/block device attribute registration regression Christoph Hellwig
2021-09-20 7:27 ` [PATCH 1/3] nvdimm/pmem: fix creating the dax group Christoph Hellwig
2021-09-20 22:52 ` Ira Weiny
2021-09-20 23:09 ` Dan Williams
2021-09-20 7:27 ` [PATCH 2/3] nvdimm/pmem: move dax_attribute_group from dax to pmem Christoph Hellwig
2021-09-20 18:00 ` kernel test robot
2021-09-20 23:29 ` Dan Williams
2021-09-20 22:51 ` Ira Weiny [this message]
2021-09-20 23:36 ` Dan Williams
2021-09-20 23:37 ` Dan Williams
2021-09-20 7:27 ` [PATCH 3/3] block: warn if ->groups is set when calling add_disk Christoph Hellwig
2021-09-20 22:52 ` Ira Weiny
2021-09-20 23:50 ` Dan Williams
2021-09-21 6:32 ` Christoph Hellwig
2021-09-22 18:33 fix a dax/block device attribute registration regression Christoph Hellwig
2021-09-22 18:33 ` [PATCH 2/3] nvdimm/pmem: move dax_attribute_group from dax to pmem Christoph Hellwig
2021-09-22 21:40 ` Ira Weiny
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