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virtio_blk: Use sysfs_match_string() helper
Use sysfs_match_string() helper instead of open coded variant. Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Jason Wang <jasowang@redhat.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Jason Wang <jasowang@redhat.com>
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@ -541,12 +541,9 @@ virtblk_cache_type_store(struct device *dev, struct device_attribute *attr,
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int i;
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BUG_ON(!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_CONFIG_WCE));
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for (i = ARRAY_SIZE(virtblk_cache_types); --i >= 0; )
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if (sysfs_streq(buf, virtblk_cache_types[i]))
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break;
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i = sysfs_match_string(virtblk_cache_types, buf);
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if (i < 0)
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return -EINVAL;
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return i;
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virtio_cwrite8(vdev, offsetof(struct virtio_blk_config, wce), i);
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virtblk_update_cache_mode(vdev);
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