This is a note to let you know that I've just added the patch titled
firmware: arm_scmi: Fix xfers allocation on Rx channel
to the 6.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
firmware-arm_scmi-fix-xfers-allocation-on-rx-channel.patch
and it can be found in the queue-6.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit d03c8b0eb62539eb992a6c41682f05559505c5e3
Author: Cristian Marussi <cristian.marussi@xxxxxxx>
Date: Sun Mar 26 21:34:49 2023 +0100
firmware: arm_scmi: Fix xfers allocation on Rx channel
[ Upstream commit b2ccba9e8cdc6fb3985cc227844e7c6af309ffb1 ]
Two distinct pools of xfer descriptors are allocated at initialization
time: one (Tx) used to provide xfers to track commands and their replies
(or delayed replies) and another (Rx) to pick xfers from to be used for
processing notifications.
Such pools, though, are allocated globally to be used by the whole SCMI
instance, they are not allocated per-channel and as such the allocation of
notifications xfers cannot be simply skipped if no Rx channel was found for
the base protocol common channel, because there could be defined more
optional per-protocol dedicated channels that instead support Rx channels.
Change the conditional check to skip allocation for the notification pool
only if no Rx channel has been detected on any per-channel protocol at all.
Fixes: 4ebd8f6dea81 ("firmware: arm_scmi: Add receive buffer support for notifications")
Signed-off-by: Cristian Marussi <cristian.marussi@xxxxxxx>
Link: https://lore.kernel.org/r/20230326203449.3492948-1-cristian.marussi@xxxxxxx
Signed-off-by: Sudeep Holla <sudeep.holla@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
index ffdad59ec81fc..fe06dc1936896 100644
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -1981,7 +1981,7 @@ static int scmi_xfer_info_init(struct scmi_info *sinfo)
return ret;
ret = __scmi_xfer_info_init(sinfo, &sinfo->tx_minfo);
- if (!ret && idr_find(&sinfo->rx_idr, SCMI_PROTOCOL_BASE))
+ if (!ret && !idr_is_empty(&sinfo->rx_idr))
ret = __scmi_xfer_info_init(sinfo, &sinfo->rx_minfo);
return ret;
