This is a note to let you know that I've just added the patch titled mailbox: pcc: Reset pcc_chan_count to zero in case of PCC probe failure to the 6.0-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: mailbox-pcc-reset-pcc_chan_count-to-zero-in-case-of-.patch and it can be found in the queue-6.0 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit ceb7a10cfd5003cb046367b86396e54179446494 Author: Huisong Li <lihuisong@xxxxxxxxxx> Date: Sat Nov 12 10:05:28 2022 +0800 mailbox: pcc: Reset pcc_chan_count to zero in case of PCC probe failure [ Upstream commit 6d7d3c287410c0ad499e478e2338dc3d7e3392b1 ] Currently, 'pcc_chan_count' is remains set to a non-zero value if PCC subspaces are parsed successfully but something else fail later during the initial PCC probing phase. This will result in pcc_mbox_request_channel trying to access the resources that are not initialised or allocated and may end up in a system crash. Reset pcc_chan_count to 0 when the PCC probe fails in order to prevent the possible issue as described above. Fixes: ce028702ddbc ("mailbox: pcc: Move bulk of PCCT parsing into pcc_mbox_probe") Signed-off-by: Huisong Li <lihuisong@xxxxxxxxxx> Reviewed-by: Sudeep Holla <sudeep.holla@xxxxxxx> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/mailbox/pcc.c b/drivers/mailbox/pcc.c index ebfa33a40fce..5e232b3fb72a 100644 --- a/drivers/mailbox/pcc.c +++ b/drivers/mailbox/pcc.c @@ -743,6 +743,7 @@ static int __init pcc_init(void) if (IS_ERR(pcc_pdev)) { pr_debug("Err creating PCC platform bundle\n"); + pcc_chan_count = 0; return PTR_ERR(pcc_pdev); }