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Code Issues Releases Wiki Activity

PCI: Use scnprintf(), not snprintf(), in sysfs "show" functions

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Sysfs "show" methods should return the number of bytes printed into the
buffer.  This is the return value of scnprintf() [1].

snprintf(buf, size, ...) prints at most "size" bytes into "buf", but
returns the number of bytes that *would* be printed if "buf" were large
enough.

Replace use of snprintf() with scnprintf().  No functional change intended.

Related:
  https://patchwork.kernel.org/patch/9946759/#20969333
  https://lwn.net/Articles/69419

[1] Documentation/filesystems/sysfs.rst

[bhelgaas: squashed, commit log]
Suggested-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/r/20200824233918.26306-2-kw@linux.com
Link: https://lore.kernel.org/r/20200824233918.26306-3-kw@linux.com
Link: https://lore.kernel.org/r/20200824233918.26306-4-kw@linux.com
Signed-off-by: Krzysztof Wilczyński <kw@linux.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Krzysztof Wilczyński 2020-08-24 23:39:16 +00:00 committed by Bjorn Helgaas
parent 035fff1f7a
commit e7a7499d84
3 changed files with 6 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
drivers/pci/p2pdma.c
View file

@ -53,7 +53,7 @@ static ssize_t size_show(struct device *dev, struct device_attribute *attr,
if (pdev->p2pdma->pool)
size = gen_pool_size(pdev->p2pdma->pool);
return snprintf(buf, PAGE_SIZE, "%zd\n", size);
return scnprintf(buf, PAGE_SIZE, "%zd\n", size);
}
static DEVICE_ATTR_RO(size);
@ -66,7 +66,7 @@ static ssize_t available_show(struct device *dev, struct device_attribute *attr,
if (pdev->p2pdma->pool)
avail = gen_pool_avail(pdev->p2pdma->pool);
return snprintf(buf, PAGE_SIZE, "%zd\n", avail);
return scnprintf(buf, PAGE_SIZE, "%zd\n", avail);
}
static DEVICE_ATTR_RO(available);
@ -75,8 +75,8 @@ static ssize_t published_show(struct device *dev, struct device_attribute *attr,
{
struct pci_dev *pdev = to_pci_dev(dev);
return snprintf(buf, PAGE_SIZE, "%d\n",
pdev->p2pdma->p2pmem_published);
return scnprintf(buf, PAGE_SIZE, "%d\n",
pdev->p2pdma->p2pmem_published);
}
static DEVICE_ATTR_RO(published);

2
drivers/pci/pci-sysfs.c
View file

@ -574,7 +574,7 @@ static ssize_t driver_override_show(struct device *dev,
ssize_t len;
device_lock(dev);
len = snprintf(buf, PAGE_SIZE, "%s\n", pdev->driver_override);
len = scnprintf(buf, PAGE_SIZE, "%s\n", pdev->driver_override);
device_unlock(dev);
return len;
}

2
drivers/pci/pci.c
View file

@ -6347,7 +6347,7 @@ static ssize_t resource_alignment_show(struct bus_type *bus, char *buf)
spin_lock(&resource_alignment_lock);
if (resource_alignment_param)
count = snprintf(buf, PAGE_SIZE, "%s", resource_alignment_param);
count = scnprintf(buf, PAGE_SIZE, "%s", resource_alignment_param);
spin_unlock(&resource_alignment_lock);
/*