linux-kernel - [15/35] PCI: return correct value when writing to the "reset" attribute

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Date:	Fri, 25 Mar 2011 17:03:47 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Michal Schmidt <mschmidt@...hat.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: [15/35] PCI: return correct value when writing to the "reset" attribute

2.6.33-longterm review patch.  If anyone has any objections, please let us know.

------------------

From: Michal Schmidt <mschmidt@...hat.com>

commit 447c5dd7338638f526e9bcf7dcf69b4da5835c7d upstream.

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@...hat.com>
Acked-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Michal Schmidt <mschmidt@...hat.com>
Signed-off-by: Jesse Barnes <jbarnes@...tuousgeek.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/pci/pci-sysfs.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -966,7 +966,12 @@ static ssize_t reset_store(struct device
 
 	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);


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