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Subject[PATCH v2 02/11] firmware: arm_scmi: Skip scmi mbox channel setup for addtional devices
Date
Now that the scmi bus supports adding multiple devices per protocol,
and since scmi_create_protocol_device calls scmi_mbox_chan_setup,
we must avoid allocating and initialising the mbox channel if it is
already initialised.

Reviewed-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
---
drivers/firmware/arm_scmi/driver.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
index dee7ce3bd815..2952fcd8dd8a 100644
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -735,6 +735,11 @@ static int scmi_mbox_chan_setup(struct scmi_info *info, struct device *dev,
idx = tx ? 0 : 1;
idr = tx ? &info->tx_idr : &info->rx_idr;

+ /* check if already allocated, used for multiple device per protocol */
+ cinfo = idr_find(idr, prot_id);
+ if (cinfo)
+ return 0;
+
if (scmi_mailbox_check(np, idx)) {
cinfo = idr_find(idr, SCMI_PROTOCOL_BASE);
if (unlikely(!cinfo)) /* Possible only if platform has no Rx */
--
2.17.1
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