[PATCH v2 0/2] of/irq: msi-parent handling in of_msi_xlate()

[Fuad Tabba <fuad.tabba@linux.dev>]

Hi folks,

Changes since v1 [1]:
  - Added patch 2: end the walk at the first node that declares an
    msi-parent, with the reference handling moved into of_msi_xlate().
    (Lorenzo)
  - Patch 1 is unchanged.

Patch 1 is the v1 fix: of_check_msi_parent() hands back a node reference
even when the caller passed one in as a filter, which of_msi_xlate()
documents as receiving none. Patch 2 is what Lorenzo asked for [2]: a
node declaring an msi-parent names the MSI controller for what sits
below it, so the walk ends there rather than carrying on to an
ancestor's msi-map.

Patch 2 removes the line patch 1 adds, along with the rest of the
reference handling. They stay separate because patch 1 is a small fix
for a leak that has been there since v6.18, and patch 2 changes
behaviour: folding them would hide the fix inside the change.

Based on Linux 7.3-rc1 (cee9395acd804).

Cheers,
/fuad

[1] https://lore.kernel.org/all/20260904073424.3855365-1-fuad.tabba@linux.dev/
[2] https://lore.kernel.org/all/apqnaNmeuUjfC8Ng@red-moon/

Fuad Tabba (2):
  of/irq: Fix device node refcount leak in of_check_msi_parent()
  of/irq: Stop the MSI walk at the first msi-parent

 drivers/of/irq.c | 39 ++++++++++++++++++++++-----------------
 1 file changed, 22 insertions(+), 17 deletions(-)

-- 
2.39.5