From: Yuan Can yuancan@huawei.com
[ Upstream commit d717a3ab282f51ec45142f911f7ef8a55c057de5 ]
A problem about idt_89hpesx create debugfs failed is triggered with the following log given:
[ 4973.269647] debugfs: Directory 'idt_csr' with parent '/' already present!
The reason is that idt_init() returns i2c_add_driver() directly without checking its return value, if i2c_add_driver() failed, it returns without destroy the newly created debugfs, resulting the debugfs of idt_csr can never be created later.
idt_init() debugfs_create_dir() # create debugfs directory i2c_add_driver() driver_register() bus_add_driver() priv = kzalloc(...) # OOM happened # return without destroy debugfs directory
Fix by removing debugfs when i2c_add_driver() returns error.
Fixes: cfad6425382e ("eeprom: Add IDT 89HPESx EEPROM/CSR driver") Signed-off-by: Yuan Can yuancan@huawei.com Acked-by: Serge Semin fancer.lancer@gmail.com Link: https://lore.kernel.org/r/20221110020030.47711-1-yuancan@huawei.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/misc/eeprom/idt_89hpesx.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/misc/eeprom/idt_89hpesx.c b/drivers/misc/eeprom/idt_89hpesx.c index bb3ed352b95f9..367054e0ced4e 100644 --- a/drivers/misc/eeprom/idt_89hpesx.c +++ b/drivers/misc/eeprom/idt_89hpesx.c @@ -1566,12 +1566,20 @@ static struct i2c_driver idt_driver = { */ static int __init idt_init(void) { + int ret; + /* Create Debugfs directory first */ if (debugfs_initialized()) csr_dbgdir = debugfs_create_dir("idt_csr", NULL);
/* Add new i2c-device driver */ - return i2c_add_driver(&idt_driver); + ret = i2c_add_driver(&idt_driver); + if (ret) { + debugfs_remove_recursive(csr_dbgdir); + return ret; + } + + return 0; } module_init(idt_init);