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virtio: Implementing attribute show with sysfs_emit
Replace sprintf with sysfs_emit or its variants for their built-in PAGE_SIZE awareness. Signed-off-by: Dawei Li <set_pte_at@outlook.com> Message-Id: <TYCP286MB23232A999FE7DBDF50BA0FAACA0F9@TYCP286MB2323.JPNP286.PROD.OUTLOOK.COM> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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@ -15,7 +15,7 @@ static ssize_t device_show(struct device *_d,
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struct device_attribute *attr, char *buf)
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{
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struct virtio_device *dev = dev_to_virtio(_d);
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return sprintf(buf, "0x%04x\n", dev->id.device);
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return sysfs_emit(buf, "0x%04x\n", dev->id.device);
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}
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static DEVICE_ATTR_RO(device);
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@ -23,7 +23,7 @@ static ssize_t vendor_show(struct device *_d,
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struct device_attribute *attr, char *buf)
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{
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struct virtio_device *dev = dev_to_virtio(_d);
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return sprintf(buf, "0x%04x\n", dev->id.vendor);
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return sysfs_emit(buf, "0x%04x\n", dev->id.vendor);
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}
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static DEVICE_ATTR_RO(vendor);
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@ -31,7 +31,7 @@ static ssize_t status_show(struct device *_d,
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struct device_attribute *attr, char *buf)
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{
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struct virtio_device *dev = dev_to_virtio(_d);
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return sprintf(buf, "0x%08x\n", dev->config->get_status(dev));
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return sysfs_emit(buf, "0x%08x\n", dev->config->get_status(dev));
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}
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static DEVICE_ATTR_RO(status);
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@ -39,7 +39,7 @@ static ssize_t modalias_show(struct device *_d,
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struct device_attribute *attr, char *buf)
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{
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struct virtio_device *dev = dev_to_virtio(_d);
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return sprintf(buf, "virtio:d%08Xv%08X\n",
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return sysfs_emit(buf, "virtio:d%08Xv%08X\n",
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dev->id.device, dev->id.vendor);
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}
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static DEVICE_ATTR_RO(modalias);
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@ -54,9 +54,9 @@ static ssize_t features_show(struct device *_d,
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/* We actually represent this as a bitstring, as it could be
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* arbitrary length in future. */
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for (i = 0; i < sizeof(dev->features)*8; i++)
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len += sprintf(buf+len, "%c",
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len += sysfs_emit_at(buf, len, "%c",
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__virtio_test_bit(dev, i) ? '1' : '0');
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len += sprintf(buf+len, "\n");
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len += sysfs_emit_at(buf, len, "\n");
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return len;
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}
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static DEVICE_ATTR_RO(features);
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