Hi Greg,
thanks for your time,
On 2023-09-11 at 20:59:18 +0200, Greg Kroah-Hartman wrote:
> On Tue, Sep 12, 2023 at 12:27:06AM +0800, Chen Yu wrote:
> > The following NULL pointer exception was found during boot up:
> >
> > calling ucsi_acpi_platform_driver_init+0x0/0xff0 [ucsi_acpi] @ 394
> > initcall mac_hid_init+0x0/0xff0 [mac_hid] returned 0 after 5 usecs
> > BUG: kernel NULL pointer dereference, address: 0000000000000020
> > Call Trace:
> > ? ucsi_debugfs_unregister+0x15/0x30 [typec_ucsi]
> > ucsi_destroy+0x17/0x30 [typec_ucsi]
> > ucsi_acpi_probe+0x1d5/0x230 [ucsi_acpi]
> >
> > It is possible that ucsi_acpi_probe() fails to install the notifier,
> > and calls ucsi_destroy() to release the resource. However at that
> > moment the debugfs has not been registered yet, thus the NULL pointer
> > exception is triggered. Add the check for debugfs pointer.
> >
> > Fixes: Commit df0383ffad64 ("usb: typec: ucsi: Add debugfs for ucsi commands")
>
> Incorrect format :(
>
Ah, the 'Commit' was incorrectly added.
> > Signed-off-by: Chen Yu <yu.c.chen@xxxxxxxxx>
> > ---
> > drivers/usb/typec/ucsi/debugfs.c | 3 ++-
> > 1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/usb/typec/ucsi/debugfs.c b/drivers/usb/typec/ucsi/debugfs.c
> > index 0c7bf88d4a7f..55533dc3d539 100644
> > --- a/drivers/usb/typec/ucsi/debugfs.c
> > +++ b/drivers/usb/typec/ucsi/debugfs.c
> > @@ -84,7 +84,8 @@ void ucsi_debugfs_register(struct ucsi *ucsi)
> >
> > void ucsi_debugfs_unregister(struct ucsi *ucsi)
> > {
> > - debugfs_remove_recursive(ucsi->debugfs->dentry);
> > + if (ucsi->debugfs)
> > + debugfs_remove_recursive(ucsi->debugfs->dentry);
> > kfree(ucsi->debugfs);
> > }
>
> What's wrong with this patch instead:
> https://lore.kernel.org/all/20230906084842.1922052-1-heikki.krogerus@xxxxxxxxxxxxxxx/
>
Thanks for this link, I'll patch my kernel using above version.
thanks,
Chenyu
