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soc: qcom: glink_smd_xprt: Serialized open ack notify and signal event

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SMD channel can get into OPENED state before even the G-Link channel
gets into OPENED/CONNECTED state. This can cause the SMD channel events
to get dropped.

Synchronize handling the SMD_OPEN_EVENT & subsequent events in an SMD
channel with the G-Link channel open operation.

CRs-Fixed: 997404
Change-Id: I4c44011b7fa3b59cbe70a125735e04a076c4d3ca
Signed-off-by: Dhoat Harpal <hdhoat@codeaurora.org>
This commit is contained in:
Dhoat Harpal 2016-02-26 18:34:10 +05:30 • committed by Kyle Yan
parent 6a1f375e9f
commit 84e397c0d4
1 changed files with 9 additions and 1 deletions
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10
drivers/soc/qcom/glink_smd_xprt.c
View file

@ -22,6 +22,7 @@
#include <linux/srcu.h>
#include <linux/termios.h>
#include <linux/workqueue.h>
#include <linux/completion.h>
#include <soc/qcom/smd.h>
#include <soc/qcom/glink.h>
#include "glink_core_if.h"
@ -162,6 +163,7 @@ struct channel {
bool streaming_ch;
bool tx_resume_needed;
bool is_tasklet_enabled;
struct completion open_notifier;
};
/**
@ -328,6 +330,7 @@ static void process_ctl_event(struct work_struct *work)
ch->edge = einfo;
mutex_init(&ch->ch_probe_lock);
mutex_init(&ch->ch_tasklet_lock);
init_completion(&ch->open_notifier);
INIT_LIST_HEAD(&ch->intents);
INIT_LIST_HEAD(&ch->used_intents);
spin_lock_init(&ch->intents_lock);
@ -420,7 +423,7 @@ static void process_ctl_event(struct work_struct *work)
__func__, cmd.id);
continue;
}
reinit_completion(&ch->open_notifier);
add_platform_driver(ch);
mutex_lock(&einfo->rx_cmd_lock);
einfo->xprt_if.glink_core_if_ptr->rx_cmd_ch_open_ack(
@ -428,6 +431,7 @@ static void process_ctl_event(struct work_struct *work)
cmd.id,
cmd.priority);
mutex_unlock(&einfo->rx_cmd_lock);
complete_all(&ch->open_notifier);
} else if (cmd.cmd == CMD_CLOSE) {
SMDXPRT_INFO(einfo, "%s RX REMOTE CLOSE rcid %u\n",
__func__, cmd.id);
@ -636,6 +640,7 @@ static void process_open_event(struct work_struct *work)
ch->is_tasklet_enabled = true;
}
mutex_unlock(&ch->ch_tasklet_lock);
wait_for_completion(&ch->open_notifier);
kfree(ch_work);
}
@ -1235,6 +1240,7 @@ static int tx_cmd_ch_open(struct glink_transport_if *if_ptr, uint32_t lcid,
ch->edge = einfo;
mutex_init(&ch->ch_probe_lock);
mutex_init(&ch->ch_tasklet_lock);
init_completion(&ch->open_notifier);
INIT_LIST_HEAD(&ch->intents);
INIT_LIST_HEAD(&ch->used_intents);
spin_lock_init(&ch->intents_lock);
@ -1305,6 +1311,7 @@ static int tx_cmd_ch_open(struct glink_transport_if *if_ptr, uint32_t lcid,
ch->rcid = lcid + LEGACY_RCID_CHANNEL_OFFSET;
ch->local_legacy = true;
ch->remote_legacy = true;
reinit_completion(&ch->open_notifier);
ret = add_platform_driver(ch);
if (!ret) {
mutex_lock(&einfo->rx_cmd_lock);
@ -1313,6 +1320,7 @@ static int tx_cmd_ch_open(struct glink_transport_if *if_ptr, uint32_t lcid,
ch->lcid, SMD_TRANS_XPRT_ID);
mutex_unlock(&einfo->rx_cmd_lock);
}
complete_all(&ch->open_notifier);
}
srcu_read_unlock(&einfo->ssr_sync, rcu_id);