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Subject[PATCH] eeprom: idt_89hpesx: Fix error handling in idt_init()
Date
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>
---
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 bb3ed352b95f..367054e0ced4 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);

--
2.17.1
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