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firmware: arm_scmi: Perform earlier cinfo lookup call in do_xfer 

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.

Link: https://lore.kernel.org/r/20211129191156.29322-2-cristian.marussi@arm.com
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Cristian Marussi 2021-11-29 19:11:41 +00:00 committed by Sudeep Holla
parent afc9c1e26b
commit d211ddeb51
1 changed files with 4 additions and 4 deletions
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8
drivers/firmware/arm_scmi/driver.c
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@ -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);