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dpll: fix dpll_xa_ref_*_del() for multiple registrations 

[ Upstream commit b446631f35 ]

Currently, if there are multiple registrations of the same pin on the
same dpll device, following warnings are observed:
WARNING: CPU: 5 PID: 2212 at drivers/dpll/dpll_core.c:143 dpll_xa_ref_pin_del.isra.0+0x21e/0x230
WARNING: CPU: 5 PID: 2212 at drivers/dpll/dpll_core.c:223 __dpll_pin_unregister+0x2b3/0x2c0

The problem is, that in both dpll_xa_ref_dpll_del() and
dpll_xa_ref_pin_del() registration is only removed from list in case the
reference count drops to zero. That is wrong, the registration has to
be removed always.

To fix this, remove the registration from the list and free
it unconditionally, instead of doing it only when the ref reference
counter reaches zero.

Fixes: 9431063ad3 ("dpll: core: Add DPLL framework base functions")
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Rahul Rameshbabu <rrameshbabu@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jiri Pirko 2024-03-06 16:12:40 +01:00 committed by Sasha Levin
parent 0307cf4433
commit b27e32e936
1 changed files with 4 additions and 4 deletions
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8
drivers/dpll/dpll_core.c
View File

@ -129,9 +129,9 @@ static int dpll_xa_ref_pin_del(struct xarray *xa_pins, struct dpll_pin *pin,
reg = dpll_pin_registration_find(ref, ops, priv);
if (WARN_ON(!reg))
return -EINVAL;
list_del(&reg->list);
kfree(reg);
if (refcount_dec_and_test(&ref->refcount)) {
list_del(&reg->list);
kfree(reg);
xa_erase(xa_pins, i);
WARN_ON(!list_empty(&ref->registration_list));
kfree(ref);
@ -209,9 +209,9 @@ dpll_xa_ref_dpll_del(struct xarray *xa_dplls, struct dpll_device *dpll,
reg = dpll_pin_registration_find(ref, ops, priv);
if (WARN_ON(!reg))
return;
list_del(&reg->list);
kfree(reg);
if (refcount_dec_and_test(&ref->refcount)) {
list_del(&reg->list);
kfree(reg);
xa_erase(xa_dplls, i);
WARN_ON(!list_empty(&ref->registration_list));
kfree(ref);