linux-kernel - [PATCH] amd64-agp: fix crash at second module load

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Message-Id: <1297117771-12392-1-git-send-email-florian@mickler.org>
Date:	Mon,  7 Feb 2011 23:29:31 +0100
From:	Florian Mickler <florian@...kler.org>
To:	airlied@...ux.ie
Cc:	randy.dunlap@...cle.com, linux-kernel@...r.kernel.org,
	Florian Mickler <florian@...kler.org>
Subject: [PATCH] amd64-agp: fix crash at second module load

The module forgot to sometimes unregister some resources.

This fixes Bug #22882.

[Patch updated to 2.6.38-rc3 by Randy Dunlap.]
Tested-by: Randy Dunlap <randy.dunlap@...cle.com>
Signed-off-by: Florian Mickler <florian@...kler.org>
---
 drivers/char/agp/amd64-agp.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/char/agp/amd64-agp.c b/drivers/char/agp/amd64-agp.c
index 9252e85..780498d 100644
--- a/drivers/char/agp/amd64-agp.c
+++ b/drivers/char/agp/amd64-agp.c
@@ -773,18 +773,23 @@ int __init agp_amd64_init(void)
 #else
 			printk(KERN_INFO PFX "You can boot with agp=try_unsupported\n");
 #endif
+			pci_unregister_driver(&agp_amd64_pci_driver);
 			return -ENODEV;
 		}
 
 		/* First check that we have at least one AMD64 NB */
-		if (!pci_dev_present(amd_nb_misc_ids))
+		if (!pci_dev_present(amd_nb_misc_ids)) {
+			pci_unregister_driver(&agp_amd64_pci_driver);
 			return -ENODEV;
+		}
 
 		/* Look for any AGP bridge */
 		agp_amd64_pci_driver.id_table = agp_amd64_pci_promisc_table;
 		err = driver_attach(&agp_amd64_pci_driver.driver);
-		if (err == 0 && agp_bridges_found == 0)
+		if (err == 0 && agp_bridges_found == 0) {
+			pci_unregister_driver(&agp_amd64_pci_driver);
 			err = -ENODEV;
+		}
 	}
 	return err;
 }
-- 
1.7.4.rc3

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