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mailbox: pcc: Reset pcc_chan_count to zero in case of PCC probe failure

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[ 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: ce028702dd ("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>
This commit is contained in:
Huisong Li 2022-11-12 10:05:28 +08:00 committed by Greg Kroah-Hartman
parent 290dd73b94
commit f0d5624fbe
1 changed files with 1 additions and 0 deletions
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drivers/mailbox/pcc.c
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@ -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);
}