linux-kernel - [PATCH v3 2/3] pci: remove redundant pci_dev

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Message-Id: <1383042632-7102-3-git-send-email-vfalico@redhat.com>
Date:	Tue, 29 Oct 2013 11:30:31 +0100
From:	Veaceslav Falico <vfalico@...hat.com>
To:	linux-pci@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, tglx@...utronix.de,
	yinghai@...nel.org, Knut_Petersen@...nline.de, mingo@...nel.org,
	paulmck@...ux.vnet.ibm.com, fweisbec@...il.com,
	linux-kernel@...r.kernel.org,
	Veaceslav Falico <vfalico@...hat.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Neil Horman <nhorman@...driver.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH v3 2/3] pci: remove redundant pci_dev_get/put() on kobject (un)register

Currently we're pci_dev_get/put()-ing pci device on every kobject
creation/removal. It's useless per se - the kobject is part of the device
itself, so it should be removed when there are no users of the pdev, and is
not a user of it.

CC: Bjorn Helgaas <bhelgaas@...gle.com>
CC: Neil Horman <nhorman@...driver.com>
CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC: linux-pci@...r.kernel.org
CC: linux-kernel@...r.kernel.org
Signed-off-by: Veaceslav Falico <vfalico@...hat.com>
---
 drivers/pci/msi.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 5d70f49..0771508 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -511,7 +511,6 @@ static void msi_kobj_release(struct kobject *kobj)
 {
 	struct msi_desc *entry = to_msi_desc(kobj);
 
-	pci_dev_put(entry->dev);
 	kfree(entry);
 }
 
@@ -534,13 +533,10 @@ static int populate_msi_sysfs(struct pci_dev *pdev)
 	list_for_each_entry(entry, &pdev->msi_list, list) {
 		kobj = &entry->kobj;
 		kobj->kset = pdev->msi_kset;
-		pci_dev_get(pdev);
 		ret = kobject_init_and_add(kobj, &msi_irq_ktype, NULL,
 				     "%u", entry->irq);
-		if (ret) {
-			pci_dev_put(pdev);
+		if (ret)
 			return ret;
-		}
 	}
 
 	return 0;
-- 
1.8.4

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