[PATCH 0/6] mailbox: Trivial updates

Several trivial updates to cleanup code.
- use dev_err for print err information
- propagate correct error value
- use guard/scoped_guard
- drop devm_mbox_controller_unregister

Tested on i.MX95 with SCMI mailbox Transport

Signed-off-by: Peng Fan <[email protected]>
---
Peng Fan (6):
      mailbox: Use dev_err when there is error
      mailbox: Not protect module_put with spin_lock_irqsave
      mailbox: Propagate correct error return value
      mailbox: Remove devm_mbox_controller_unregister
      mailbox: Use guard/scoped_guard for con_mutex
      mailbox: Use guard/scoped_guard for spinlock

 drivers/mailbox/mailbox.c          | 199 ++++++++++++++-----------------------
 include/linux/mailbox_controller.h |   3 -
 2 files changed, 74 insertions(+), 128 deletions(-)
---
base-commit: c10fe6005a47b49097119488ebb0cc80301623a8
change-id: 20250409-mailbox-cleanup-56d920f13cb8

Best regards,
-- 
Peng Fan <[email protected]>