[PATCH v4 01/12] firmware: arm_scmi: Perform earlier cinfo lookup call in do_xfer

[Cristian Marussi <cristian.marussi@arm.com>]

Lookup cinfo data early in do_xfer so as to avoid any further init work
on xfer structure in case of error.

No functional change.

Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
---
 drivers/firmware/arm_scmi/driver.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
index b406b3f78f46..01c79a8fa77f 100644
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -766,6 +766,10 @@ static int do_xfer(const struct scmi_protocol_handle *ph,
 		return -EINVAL;
 	}
 
+	cinfo = idr_find(&info->tx_idr, pi->proto->id);
+	if (unlikely(!cinfo))
+		return -EINVAL;
+
 	/*
 	 * Initialise protocol id now from protocol handle to avoid it being
 	 * overridden by mistake (or malice) by the protocol code mangling with
@@ -774,10 +778,6 @@ static int do_xfer(const struct scmi_protocol_handle *ph,
 	xfer->hdr.protocol_id = pi->proto->id;
 	reinit_completion(&xfer->done);
 
-	cinfo = idr_find(&info->tx_idr, xfer->hdr.protocol_id);
-	if (unlikely(!cinfo))
-		return -EINVAL;
-
 	trace_scmi_xfer_begin(xfer->transfer_id, xfer->hdr.id,
 			      xfer->hdr.protocol_id, xfer->hdr.seq,
 			      xfer->hdr.poll_completion);
-- 
2.17.1