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rpmsg: smd: Perform handshake during open

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Validate the the remote side is opening the channel that we've found by
performing a handshake when opening the channel.

Tested-by: Will Newton <will.newton@gmail.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Bjorn Andersson 2017-12-12 15:58:53 -08:00
parent 9d32497361
commit 268105fbc0
1 changed files with 30 additions and 0 deletions
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30
drivers/rpmsg/qcom_smd.c
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@ -200,6 +200,7 @@ struct qcom_smd_channel {
char *name;
enum smd_channel_state state;
enum smd_channel_state remote_state;
wait_queue_head_t state_change_event;
struct smd_channel_info_pair *info;
struct smd_channel_info_word_pair *info_word;
@ -570,6 +571,8 @@ static bool qcom_smd_channel_intr(struct qcom_smd_channel *channel)
if (remote_state != channel->remote_state) {
channel->remote_state = remote_state;
need_state_scan = true;
wake_up_interruptible_all(&channel->state_change_event);
}
/* Indicate that we have seen any state change */
SET_RX_CHANNEL_FLAG(channel, fSTATE, 0);
@ -786,7 +789,9 @@ out:
static int qcom_smd_channel_open(struct qcom_smd_channel *channel,
rpmsg_rx_cb_t cb)
{
struct qcom_smd_edge *edge = channel->edge;
size_t bb_size;
int ret;
/*
* Packets are maximum 4k, but reduce if the fifo is smaller
@ -798,9 +803,33 @@ static int qcom_smd_channel_open(struct qcom_smd_channel *channel,
qcom_smd_channel_set_callback(channel, cb);
qcom_smd_channel_set_state(channel, SMD_CHANNEL_OPENING);
/* Wait for remote to enter opening or opened */
ret = wait_event_interruptible_timeout(channel->state_change_event,
channel->remote_state == SMD_CHANNEL_OPENING ||
channel->remote_state == SMD_CHANNEL_OPENED,
HZ);
if (!ret) {
dev_err(&edge->dev, "remote side did not enter opening state\n");
goto out_close_timeout;
}
qcom_smd_channel_set_state(channel, SMD_CHANNEL_OPENED);
/* Wait for remote to enter opened */
ret = wait_event_interruptible_timeout(channel->state_change_event,
channel->remote_state == SMD_CHANNEL_OPENED,
HZ);
if (!ret) {
dev_err(&edge->dev, "remote side did not enter open state\n");
goto out_close_timeout;
}
return 0;
out_close_timeout:
qcom_smd_channel_set_state(channel, SMD_CHANNEL_CLOSED);
return -ETIMEDOUT;
}
/*
@ -1055,6 +1084,7 @@ static struct qcom_smd_channel *qcom_smd_create_channel(struct qcom_smd_edge *ed
mutex_init(&channel->tx_lock);
spin_lock_init(&channel->recv_lock);
init_waitqueue_head(&channel->fblockread_event);
init_waitqueue_head(&channel->state_change_event);
info = qcom_smem_get(edge->remote_pid, smem_info_item, &info_size);
if (IS_ERR(info)) {