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authorYuan Can <yuancan@huawei.com>2022-11-05 09:43:09 +0000
committerJon Mason <jdmason@kudzu.us>2023-07-08 10:51:55 -0400
commit98af0a33c1101c29b3ce4f0cf4715fd927c717f9 (patch)
tree116b8fbd37c4a78e2fa39ed48a7c529f9dcb1df8
parentc012968259b451dc4db407f2310fe131eaefd800 (diff)
NTB: amd: Fix error handling in amd_ntb_pci_driver_init()
A problem about ntb_hw_amd create debugfs failed is triggered with the following log given: [ 618.431232] AMD(R) PCI-E Non-Transparent Bridge Driver 1.0 [ 618.433284] debugfs: Directory 'ntb_hw_amd' with parent '/' already present! The reason is that amd_ntb_pci_driver_init() returns pci_register_driver() directly without checking its return value, if pci_register_driver() failed, it returns without destroy the newly created debugfs, resulting the debugfs of ntb_hw_amd can never be created later. amd_ntb_pci_driver_init() debugfs_create_dir() # create debugfs directory pci_register_driver() driver_register() bus_add_driver() priv = kzalloc(...) # OOM happened # return without destroy debugfs directory Fix by removing debugfs when pci_register_driver() returns error. Fixes: a1b3695820aa ("NTB: Add support for AMD PCI-Express Non-Transparent Bridge") Signed-off-by: Yuan Can <yuancan@huawei.com> Signed-off-by: Jon Mason <jdmason@kudzu.us>
-rw-r--r--drivers/ntb/hw/amd/ntb_hw_amd.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/ntb/hw/amd/ntb_hw_amd.c b/drivers/ntb/hw/amd/ntb_hw_amd.c
index 04550b1f984c..730f2103b91d 100644
--- a/drivers/ntb/hw/amd/ntb_hw_amd.c
+++ b/drivers/ntb/hw/amd/ntb_hw_amd.c
@@ -1338,12 +1338,17 @@ static struct pci_driver amd_ntb_pci_driver = {
static int __init amd_ntb_pci_driver_init(void)
{
+ int ret;
pr_info("%s %s\n", NTB_DESC, NTB_VER);
if (debugfs_initialized())
debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL);
- return pci_register_driver(&amd_ntb_pci_driver);
+ ret = pci_register_driver(&amd_ntb_pci_driver);
+ if (ret)
+ debugfs_remove_recursive(debugfs_dir);
+
+ return ret;
}
module_init(amd_ntb_pci_driver_init);