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.
Unified · Split
| @@ -1566,12 +1566,20 @@ static struct i2c_driver idt_driver = { · 1565 unmodified lines | |||
| 1566 | */ | 1566 | */ |
| 1567 | static int __init idt_init(void) | 1567 | static int __init idt_init(void) |
| 1568 | { | 1568 | { |
| 1569 | int ret; | ||
| 1570 | |||
| 1569 | /* Create Debugfs directory first */ | 1571 | /* Create Debugfs directory first */ |
| 1570 | if (debugfs_initialized()) | 1572 | if (debugfs_initialized()) |
| 1571 | csr_dbgdir = debugfs_create_dir("idt_csr", NULL); | 1573 | csr_dbgdir = debugfs_create_dir("idt_csr", NULL); |
| 1572 | 1574 | ||
| 1573 | /* Add new i2c-device driver */ | 1575 | /* Add new i2c-device driver */ |
| 1574 | return i2c_add_driver(&idt_driver); | 1576 | ret = i2c_add_driver(&idt_driver); |
| 1577 | if (ret) { | ||
| 1578 | debugfs_remove_recursive(csr_dbgdir); | ||
| 1579 | return ret; | ||
| 1580 | } | ||
| 1581 | |||
| 1582 | return 0; | ||
| 1575 | } | 1583 | } |
| 1576 | module_init(idt_init); | 1584 | module_init(idt_init); |
| 1577 | 1585 | ||