6.6-stable review patch. If anyone has any objections, please let me know.
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From: Cristian Marussi cristian.marussi@arm.com
[ Upstream commit e98dba934b2fc587eafb83f47ad64d9053b18ae0 ]
Channels can be shared between protocols, avoid freeing the same channel descriptors twice when unloading the stack.
Fixes: 5f90f189a052 ("firmware: arm_scmi: Add optee transport") Signed-off-by: Cristian Marussi cristian.marussi@arm.com Tested-by: Peng Fan peng.fan@nxp.com #i.MX95 19x19 EVK Reviewed-by: Peng Fan peng.fan@nxp.com Tested-by: Florian Fainelli florian.fainelli@broadcom.com Message-Id: 20240812173340.3912830-2-cristian.marussi@arm.com Signed-off-by: Sudeep Holla sudeep.holla@arm.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/firmware/arm_scmi/optee.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/drivers/firmware/arm_scmi/optee.c b/drivers/firmware/arm_scmi/optee.c index e123de6e8c67a..aa02392265d32 100644 --- a/drivers/firmware/arm_scmi/optee.c +++ b/drivers/firmware/arm_scmi/optee.c @@ -467,6 +467,13 @@ static int scmi_optee_chan_free(int id, void *p, void *data) struct scmi_chan_info *cinfo = p; struct scmi_optee_channel *channel = cinfo->transport_info;
+ /* + * Different protocols might share the same chan info, so a previous + * call might have already freed the structure. + */ + if (!channel) + return 0; + mutex_lock(&scmi_optee_private->mu); list_del(&channel->link); mutex_unlock(&scmi_optee_private->mu);