linux-kernel - [PATCH 1/4] PCI: allow multiple calls to pcim_pin

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Date:	Fri,  9 Mar 2007 20:08:31 -0800
From:	Greg Kroah-Hartman <gregkh@...e.de>
To:	linux-pci@...ey.karlin.mff.cuni.cz
Cc:	linux-kernel@...r.kernel.org, pcihpd-discuss@...ts.sourceforge.net,
	Tejun Heo <htejun@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH 1/4] PCI: allow multiple calls to pcim_pin_device()

From: Tejun Heo <htejun@...il.com>

Sanity check in pcim_pin_device() was too restrictive in that it didn't
allow multiple calls to the function, which is against the devres
philosohpy of fire-and-forget.  Track pinned status separately and allow
pinning multiple times.

Signed-off-by: Tejun Heo <htejun@...il.com>
Acked-by: Ian McDonald <ian.mcdonald@...di.co.nz>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 drivers/pci/pci.c |   15 ++++++++-------
 1 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index df49530..a32db06 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -757,7 +757,8 @@ int pci_enable_device(struct pci_dev *dev)
  * when a device is enabled using managed PCI device enable interface.
  */
 struct pci_devres {
-	unsigned int disable:1;
+	unsigned int enabled:1;
+	unsigned int pinned:1;
 	unsigned int orig_intx:1;
 	unsigned int restore_intx:1;
 	u32 region_mask;
@@ -781,7 +782,7 @@ static void pcim_release(struct device *gendev, void *res)
 	if (this->restore_intx)
 		pci_intx(dev, this->orig_intx);
 
-	if (this->disable)
+	if (this->enabled && !this->pinned)
 		pci_disable_device(dev);
 }
 
@@ -820,12 +821,12 @@ int pcim_enable_device(struct pci_dev *pdev)
 	dr = get_pci_dr(pdev);
 	if (unlikely(!dr))
 		return -ENOMEM;
-	WARN_ON(!!dr->disable);
+	WARN_ON(!!dr->enabled);
 
 	rc = pci_enable_device(pdev);
 	if (!rc) {
 		pdev->is_managed = 1;
-		dr->disable = 1;
+		dr->enabled = 1;
 	}
 	return rc;
 }
@@ -843,9 +844,9 @@ void pcim_pin_device(struct pci_dev *pdev)
 	struct pci_devres *dr;
 
 	dr = find_pci_dr(pdev);
-	WARN_ON(!dr || !dr->disable);
+	WARN_ON(!dr || !dr->enabled);
 	if (dr)
-		dr->disable = 0;
+		dr->pinned = 1;
 }
 
 /**
@@ -876,7 +877,7 @@ pci_disable_device(struct pci_dev *dev)
 
 	dr = find_pci_dr(dev);
 	if (dr)
-		dr->disable = 0;
+		dr->enabled = 0;
 
 	if (atomic_sub_return(1, &dev->enable_cnt) != 0)
 		return;
-- 
1.5.0.2

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