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Commit 898efa1f authored by Dhoat Harpal's avatar Dhoat Harpal Committed by Gerrit - the friendly Code Review server
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soc: qcom: glink_smd_xprt: Fix ssr sync during intent request 



Synchronization is absent between SSR and intent request, which
result in dead lock scenerio.

ssr_sync rcu lock is used to synchronize intent request and SSR.

CRs-Fixed: 1025593
Change-Id: I1ac06aace8d79ad92d2b48cfb51e1394ef68906c
Signed-off-by: default avatarDhoat Harpal <hdhoat@codeaurora.org>
parent 400520a6

drivers/soc/qcom/glink_smd_xprt.c

+7 −0
Original line number Diff line number Diff line
@@ -1854,8 +1854,14 @@ static int tx_cmd_rx_intent_req(struct glink_transport_if *if_ptr, 
	struct edge_info *einfo;

	struct channel *ch;

	unsigned long flags;

	int rcu_id;



	einfo = container_of(if_ptr, struct edge_info, xprt_if);

	rcu_id = srcu_read_lock(&einfo->ssr_sync);

	if (einfo->in_ssr) {

		srcu_read_unlock(&einfo->ssr_sync, rcu_id);

		return -EFAULT;

	}

	spin_lock_irqsave(&einfo->channels_lock, flags);

	list_for_each_entry(ch, &einfo->channels, node) {

		if (lcid == ch->lcid)
@@ -1871,6 +1877,7 @@ static int tx_cmd_rx_intent_req(struct glink_transport_if *if_ptr, 
							ch->rcid,

							ch->next_intent_id++,

							size);

	srcu_read_unlock(&einfo->ssr_sync, rcu_id);

	return 0;

}