nvme-fc: fix the fc_appid_store return value
"nvme-fc: fold t fc_update_appid into fc_appid_store" accidentally
changed the userspace interface for the appid attribute, because the code
that decrements "count" to remove a trailing '\n' in the parsing results
in the decremented value being incorrectly be returned from the sysfs
write. Fix this by keeping an orig_count variable for the full length
of the write.
Fixes: c814153c83
("nvme-fc: fold t fc_update_appid into fc_appid_store")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Ewan D. Milne <emilne@redhat.com>
Reviewed-by: James Smart <jsmart2021@gmail.com>
Tested-by: Muneendra Kumar M <muneendra.kumar@broadcom.com>
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@ -3880,6 +3880,7 @@ static int fc_parse_cgrpid(const char *buf, u64 *id)
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static ssize_t fc_appid_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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size_t orig_count = count;
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u64 cgrp_id;
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int appid_len = 0;
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int cgrpid_len = 0;
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@ -3904,7 +3905,7 @@ static ssize_t fc_appid_store(struct device *dev,
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ret = blkcg_set_fc_appid(app_id, cgrp_id, sizeof(app_id));
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if (ret < 0)
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return ret;
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return count;
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return orig_count;
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}
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static DEVICE_ATTR(appid_store, 0200, NULL, fc_appid_store);
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#endif /* CONFIG_BLK_CGROUP_FC_APPID */
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