Merge tag 'ffa-fixes-6.16' of https://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux into arm/fixes

Arm FF-A fixes for v6.16

Couple of fixes to address:

1. The safety and memory issues in the FF-A notification callback handler:

   The fixes replaces a mutex with an rwlock to prevent sleeping in atomic
   context, resolving kernel warnings. Memory allocation is moved outside
   the lock to support this transition safely. Additionally, a memory leak
   in the notifier unregistration path is fixed by properly freeing the
   callback node.

2. The missing entry in struct ffa_indirect_msg_hdr:

   The fix adds the missing 32 bit reserved entry in the structure as
   required by the FF-A specification.

* tag 'ffa-fixes-6.16' of https://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux:
  firmware: arm_ffa: Fix the missing entry in struct ffa_indirect_msg_hdr
  firmware: arm_ffa: Replace mutex with rwlock to avoid sleep in atomic context
  firmware: arm_ffa: Move memory allocation outside the mutex locking
  firmware: arm_ffa: Fix memory leak by freeing notifier callback node

Link: https://lore.kernel.org/r/20250609105207.1185570-1-sudeep.holla@arm.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

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