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

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Message-ID: <20100511094453.12485.43792.stgit@leela.lan>
Date:	Tue, 11 May 2010 11:44:54 +0200
From:	Michal Schmidt <mschmidt@...hat.com>
To:	linux-pci@...r.kernel.org
Cc:	"Michael S. Tsirkin" <mst@...hat.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] 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.

Signed-off-by: Michal Schmidt <mschmidt@...hat.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 fad9398..ba88a2f 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);

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