mailbox: pcc: Serialize channel updates with shared memory teardown

mbox_free_channel() makes a PCC channel available before the subsequent
shared-memory unmap. Without serialization, a concurrent request can bind a
new client and replace the mapping, which the old release then unmaps.

Serialize PCC channel acquisition and release. Keep the channel unavailable
until the old shared-memory mapping has been removed.

Suggested-by: Sudeep Holla <sudeep.holla@kernel.org>
Signed-off-by: Christian Loehle <christian.loehle@arm.com>
Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>

0 files changed, 0 insertions, 0 deletions