2022-11-24 16:16:44

by Dawei Li

Subject: [PATCH v2] 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 <[email protected]>
---
v1->v2:
- Remove callback sanity check.

v1:
- https://lore.kernel.org/all/TYCP286MB23234D3251765359630AD72ECA0C9@TYCP286MB2323.JPNP286.PROD.OUTLOOK.COM/

drivers/virtio/virtio.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index 828ced060742..b9a80aedee1b 100644
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -15,7 +15,7 @@ static ssize_t device_show(struct device *_d,
struct device_attribute *attr, char *buf)
{
struct virtio_device *dev = dev_to_virtio(_d);
- return sprintf(buf, "0x%04x\n", dev->id.device);
+ return sysfs_emit(buf, "0x%04x\n", dev->id.device);
}
static DEVICE_ATTR_RO(device);

@@ -23,7 +23,7 @@ static ssize_t vendor_show(struct device *_d,
struct device_attribute *attr, char *buf)
{
struct virtio_device *dev = dev_to_virtio(_d);
- return sprintf(buf, "0x%04x\n", dev->id.vendor);
+ return sysfs_emit(buf, "0x%04x\n", dev->id.vendor);
}
static DEVICE_ATTR_RO(vendor);

@@ -31,7 +31,7 @@ static ssize_t status_show(struct device *_d,
struct device_attribute *attr, char *buf)
{
struct virtio_device *dev = dev_to_virtio(_d);
- return sprintf(buf, "0x%08x\n", dev->config->get_status(dev));
+ return sysfs_emit(buf, "0x%08x\n", dev->config->get_status(dev));
}
static DEVICE_ATTR_RO(status);

@@ -39,7 +39,7 @@ static ssize_t modalias_show(struct device *_d,
struct device_attribute *attr, char *buf)
{
struct virtio_device *dev = dev_to_virtio(_d);
- return sprintf(buf, "virtio:d%08Xv%08X\n",
+ return sysfs_emit(buf, "virtio:d%08Xv%08X\n",
dev->id.device, dev->id.vendor);
}
static DEVICE_ATTR_RO(modalias);
@@ -54,9 +54,9 @@ static ssize_t features_show(struct device *_d,
/* We actually represent this as a bitstring, as it could be
* arbitrary length in future. */
for (i = 0; i < sizeof(dev->features)*8; i++)
- len += sprintf(buf+len, "%c",
+ len += sysfs_emit_at(buf, len, "%c",
__virtio_test_bit(dev, i) ? '1' : '0');
- len += sprintf(buf+len, "\n");
+ len += sysfs_emit_at(buf, len, "\n");
return len;
}
static DEVICE_ATTR_RO(features);
--
2.25.1