[PATCH 0/3] mailbox: pcc: Improve completion handling and validation

[Sudeep Holla <sudeep.holla@kernel.org>]

Hi Jassi,

This series addresses three issues in the PCC mailbox controller which
are on the list for a while and discussed/reviewed. Please pick them
for v7.3 or let me know if you prefer pull request.

First, notify clients through their receive callback when a command
completes through polling, matching the interrupt-driven completion
path.

Second, centralize PCC shared memory signature checking in the mailbox
controller. Invalid signatures are reported without rejecting otherwise
working firmware, while mappings too small to contain a signature remain
fatal.

Finally, fix a race where a fast platform can signal command completion
before the channel is marked in use, causing a shared interrupt to be
ignored and the command to time out. Publish the channel state before
ringing the doorbell and use READ_ONCE()/WRITE_ONCE() for the lockless
flag accesses.

Regards,
Sudeep

Huisong Li (1):
  mailbox: pcc: Fix command timeout due to missed interrupt

Sudeep Holla (2):
  mailbox: pcc: Notify clients on polled completion
  mailbox: pcc: Check shared memory signature on request

 drivers/mailbox/pcc.c | 85 +++++++++++++++++++++++++++++++++----------
 1 file changed, 66 insertions(+), 19 deletions(-)

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2.43.0