On Sunday 07 October 2012 11:57:12 Constantine Shulyupin wrote:
> From: Constantine Shulyupin <const@xxxxxxxxxxxxx>
>
> Function skel_open increments usage count for the device with kref_get and the usage count should be decremented on the function failure.
>
> Some last changes in function skel_open and finally commit
> 52a7499 Revert "USB: usb-skeleton.c: fix open/disconnect race"
> introduced a bug in function skel_open, which this patch fixes.
>
> Signed-off-by: Constantine Shulyupin <const@xxxxxxxxxxxxx>
> ---
> drivers/usb/usb-skeleton.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/usb-skeleton.c b/drivers/usb/usb-skeleton.c
> index 0616f23..027005b 100644
> --- a/drivers/usb/usb-skeleton.c
> +++ b/drivers/usb/usb-skeleton.c
> @@ -113,8 +113,10 @@ static int skel_open(struct inode *inode, struct file *file)
> mutex_lock(&dev->io_mutex);
>
> retval = usb_autopm_get_interface(interface);
> - if (retval)
> - goto out_err;
> + if (retval) {
> + kref_put(&dev->kref, skel_delete);
> + goto exit;
> + }
>
> /* save our object in the file's private structure */
> file->private_data = dev;
Hi,
good catch, but the fix is wrong. You also need to drop the lock.
Regards
Oliver
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