PCI: return correct value when writing to the "reset" attribute

A successful write() to the "reset" sysfs attribute should return the
number of bytes written, not 0. Otherwise userspace (bash) retries the
write over and over again.

Acked-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Michal Schmidt <mschmidt@redhat.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 941e939d1da..89a08ed39c9 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -960,7 +960,12 @@ static ssize_t reset_store(struct device *dev,
 
         if (val != 1)
                 return -EINVAL;
-        return pci_reset_function(pdev);
+
+        result = pci_reset_function(pdev);
+        if (result < 0)
+                return result;
+
+        return count;
 }
 
 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);