From: Huisong Li lihuisong@huawei.com
[ 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@huawei.com Reviewed-by: Sudeep Holla sudeep.holla@arm.com Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/mailbox/pcc.c | 1 + 1 file changed, 1 insertion(+)
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); }