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[v5,5/5] PCI/sysfs: Only show value when driver_override is not NULL

Message ID 20210527201650.221944-5-kw@linux.com (mailing list archive)
State Superseded
Delegated to: Bjorn Helgaas
Headers show
Series [v5,1/5] PCI/sysfs: Use sysfs_emit() and sysfs_emit_at() in "show" functions | expand

Commit Message

Krzysztof Wilczyński May 27, 2021, 8:16 p.m. UTC 
Only expose the value of the "driver_override" variable through the
corresponding sysfs object when a value is actually set.

Signed-off-by: Krzysztof Wilczyński <kw@linux.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
---
Changes in v2:
  None.
Changes in v3:
  Added Logan Gunthorpe's "Reviewed-by".
Changes in v4:
  None.
Changes in v5:
  None.

 drivers/pci/pci-sysfs.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 5d63df7c1820..4e9f582ca10f 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -580,10 +580,11 @@  static ssize_t driver_override_show(struct device *dev,
 				    struct device_attribute *attr, char *buf)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
-	ssize_t len;
+	ssize_t len = 0;
 
 	device_lock(dev);
-	len = sysfs_emit(buf, "%s\n", pdev->driver_override);
+	if (pdev->driver_override)
+		len = sysfs_emit(buf, "%s\n", pdev->driver_override);
 	device_unlock(dev);
 	return len;
 }