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| author | Yuan Can <yuancan@huawei.com> | 2022-11-05 12:43:22 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-07-23 14:49:23 +0300 |
| commit | bece67815ab474b84b414443b1a72cb9450af63a (patch) | |
| tree | c3abb19a03e39d7ca66a9f50bddd47c80bce5bb7 /drivers/ntb | |
| parent | d4317d41f0007ff9a362705c8af608d30ee84f84 (diff) | |
| download | linux-bece67815ab474b84b414443b1a72cb9450af63a.tar.xz | |
ntb: intel: Fix error handling in intel_ntb_pci_driver_init()
[ Upstream commit 4c3c796aca02883ad35bb117468938cc4022ca41 ]
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>
Acked-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/ntb')
| -rw-r--r-- | drivers/ntb/hw/intel/ntb_hw_gen1.c | 7 |
1 files changed, 6 insertions, 1 deletions
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); |