From: Yuan Can <yuancan@huawei.com>
To: <dave.jiang@intel.com>, <jdmason@kudzu.us>, <allenbh@gmail.com>,
<ntb@lists.linux.dev>
Cc: <yuancan@huawei.com>
Subject: [PATCH] ntb: intel: Fix error handling in intel_ntb_pci_driver_init()
Date: Sat, 5 Nov 2022 09:43:22 +0000 [thread overview]
Message-ID: <20221105094322.106585-1-yuancan@huawei.com> (raw)
A problem about ntb_hw_intel create debugfs failed is triggered with the
following log given:
[ 273.112733] Intel(R) PCI-E Non-Transparent Bridge Driver 2.0
[ 273.115342] debugfs: Directory 'ntb_hw_intel' with parent '/' already present!
The reason is that intel_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_intel can never be created later.
intel_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: e26a5843f7f5 ("NTB: Split ntb_hw_intel and ntb_transport drivers")
Signed-off-by: Yuan Can <yuancan@huawei.com>
---
drivers/ntb/hw/intel/ntb_hw_gen1.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/ntb/hw/intel/ntb_hw_gen1.c b/drivers/ntb/hw/intel/ntb_hw_gen1.c
index 84772013812b..60a4ebc7bf35 100644
--- a/drivers/ntb/hw/intel/ntb_hw_gen1.c
+++ b/drivers/ntb/hw/intel/ntb_hw_gen1.c
@@ -2064,12 +2064,17 @@ static struct pci_driver intel_ntb_pci_driver = {
static int __init intel_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(&intel_ntb_pci_driver);
+ ret = pci_register_driver(&intel_ntb_pci_driver);
+ if (ret)
+ debugfs_remove_recursive(debugfs_dir);
+
+ return ret;
}
module_init(intel_ntb_pci_driver_init);
--
2.17.1
next reply other threads:[~2022-11-05 10:05 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-05 9:43 Yuan Can [this message]
2022-11-07 15:28 ` [PATCH] ntb: intel: Fix error handling in intel_ntb_pci_driver_init() Dave Jiang
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