4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: RD Babiera <rdbabiera@xxxxxxxxxx>
commit 5962ded777d689cd8bf04454273e32228d7fb71f upstream.
When typec_altmode_put_partner is called by a plug altmode upon release,
the port altmode the plug belongs to will not remove its reference to the
plug. The check to see if the altmode being released is a plug evaluates
against the released altmode's partner instead of the calling altmode, so
change adev in typec_altmode_put_partner to properly refer to the altmode
being released.
Because typec_altmode_set_partner calls get_device() on the port altmode,
add partner_adev that points to the port altmode in typec_put_partner to
call put_device() on. typec_altmode_set_partner is not called for port
altmodes, so add a check in typec_altmode_release to prevent
typec_altmode_put_partner() calls on port altmode release.
Fixes: 8a37d87d72f0 ("usb: typec: Bus type for alternate modes")
Cc: <stable@xxxxxxxxxxxxxxx>
Co-developed-by: Christian A. Ehrhardt <lk@xxxxxxx>
Signed-off-by: Christian A. Ehrhardt <lk@xxxxxxx>
Signed-off-by: RD Babiera <rdbabiera@xxxxxxxxxx>
Tested-by: Christian A. Ehrhardt <lk@xxxxxxx>
Acked-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240103181754.2492492-2-rdbabiera@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/typec/class.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -188,11 +188,13 @@ static void typec_altmode_put_partner(st
{
struct altmode *partner = altmode->partner;
struct typec_altmode *adev;
+ struct typec_altmode *partner_adev;
if (!partner)
return;
- adev = &partner->adev;
+ adev = &altmode->adev;
+ partner_adev = &partner->adev;
if (is_typec_plug(adev->dev.parent)) {
struct typec_plug *plug = to_typec_plug(adev->dev.parent);
@@ -201,7 +203,7 @@ static void typec_altmode_put_partner(st
} else {
partner->partner = NULL;
}
- put_device(&adev->dev);
+ put_device(&partner_adev->dev);
}
static int __typec_port_match(struct device *dev, const void *name)
@@ -459,7 +461,8 @@ static void typec_altmode_release(struct
{
struct altmode *alt = to_altmode(to_typec_altmode(dev));
- typec_altmode_put_partner(alt);
+ if (!is_typec_port(dev->parent))
+ typec_altmode_put_partner(alt);
altmode_id_remove(alt->adev.dev.parent, alt->id);
kfree(alt);
