https://github.com/torvalds/linux
Revision c012968259b451dc4db407f2310fe131eaefd800 authored by Yuan Can on 05 November 2022, 09:43:01 UTC, committed by Jon Mason on 08 July 2023, 14:51:55 UTC
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>
1 parent 6995e2d
History
Tip revision: c012968259b451dc4db407f2310fe131eaefd800 authored by Yuan Can on 05 November 2022, 09:43:01 UTC
ntb: idt: Fix error handling in idt_pci_driver_init()
Tip revision: c012968
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