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| author | Yuan Can <yuancan@huawei.com> | 2022-11-05 10:43:01 +0100 |
|---|---|---|
| committer | Jon Mason <jdmason@kudzu.us> | 2023-07-08 16:51:55 +0200 |
| commit | c012968259b451dc4db407f2310fe131eaefd800 (patch) | |
| tree | 8ea78789c6ee47d1a27e7997904c916fd60f3caa | |
| parent | Linux 6.4 (diff) | |
| download | linux-c012968259b451dc4db407f2310fe131eaefd800.tar.xz linux-c012968259b451dc4db407f2310fe131eaefd800.zip | |
ntb: idt: Fix error handling in idt_pci_driver_init()
A problem about ntb_hw_idt create debugfs failed is triggered with the
following log given:
[ 1236.637636] IDT PCI-E Non-Transparent Bridge Driver 2.0
[ 1236.639292] debugfs: Directory 'ntb_hw_idt' with parent '/' already present!
The reason is that idt_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_idt can never be created later.
idt_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: bf2a952d31d2 ("NTB: Add IDT 89HPESxNTx PCIe-switches support")
Signed-off-by: Yuan Can <yuancan@huawei.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
| -rw-r--r-- | drivers/ntb/hw/idt/ntb_hw_idt.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/ntb/hw/idt/ntb_hw_idt.c b/drivers/ntb/hw/idt/ntb_hw_idt.c index 0ed6f809ff2e..51799fccf840 100644 --- a/drivers/ntb/hw/idt/ntb_hw_idt.c +++ b/drivers/ntb/hw/idt/ntb_hw_idt.c @@ -2891,6 +2891,7 @@ static struct pci_driver idt_pci_driver = { static int __init idt_pci_driver_init(void) { + int ret; pr_info("%s %s\n", NTB_DESC, NTB_VER); /* Create the top DebugFS directory if the FS is initialized */ @@ -2898,7 +2899,11 @@ static int __init idt_pci_driver_init(void) dbgfs_topdir = debugfs_create_dir(KBUILD_MODNAME, NULL); /* Register the NTB hardware driver to handle the PCI device */ - return pci_register_driver(&idt_pci_driver); + ret = pci_register_driver(&idt_pci_driver); + if (ret) + debugfs_remove_recursive(dbgfs_topdir); + + return ret; } module_init(idt_pci_driver_init); |