[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-ID: <20221110121432.dtbuumgglj36v5kt@mobilestation>
Date: Thu, 10 Nov 2022 15:14:32 +0300
From: Serge Semin <fancer.lancer@...il.com>
To: Yuan Can <yuancan@...wei.com>
Cc: arnd@...db.de, gregkh@...uxfoundation.org,
wsa+renesas@...g-engineering.com, benjamin.mugnier@...s.st.com,
dmitry.torokhov@...il.com, cmo@...exis.com,
u.kleine-koenig@...gutronix.de, error27@...il.com,
justinstitt@...gle.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] eeprom: idt_89hpesx: Fix error handling in idt_init()
Hi Yuan,
On Thu, Nov 10, 2022 at 02:00:30AM +0000, Yuan Can wrote:
> 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@...wei.com>
Don't know what I was thinking back than. Thanks for fixing this.
Acked-by: Serge Semin <fancer.lancer@...il.com>
-Sergey
> ---
> 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
>
Powered by blists - more mailing lists