linux-kernel - [34-longterm 222/247] PCI: return correct value when writing to the "reset" attribute

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Date:	Thu, 23 Jun 2011 13:34:50 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	stable@...nel.org, linux-kernel@...r.kernel.org
Cc:	stable-review@...nel.org, Michal Schmidt <mschmidt@...hat.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [34-longterm 222/247] PCI: return correct value when writing to the "reset" attribute

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

                   -------------------
    This is a commit scheduled for the next v2.6.34 longterm release.
    If you see a problem with using this for longterm, please comment.
                   -------------------

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: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 drivers/pci/pci-sysfs.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index e1783bb..4d49aea 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -971,7 +971,12 @@ 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);
-- 
1.7.4.4

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