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| author | Bjorn Andersson <quic_bjorande@quicinc.com> | 2023-02-13 07:52:14 -0800 |
|---|---|---|
| committer | Bjorn Andersson <andersson@kernel.org> | 2023-02-14 08:19:38 -0800 |
| commit | 9c96bacf1af51bc71898f31e025f08338c6ca4da (patch) | |
| tree | c2daaa7ef80fa8e00961641c381bcd6797f9d215 /drivers/rpmsg | |
| parent | f424d1cbe8c7ef78a4b639502fa9904c4198387b (diff) | |
| download | lwn-9c96bacf1af51bc71898f31e025f08338c6ca4da.tar.gz lwn-9c96bacf1af51bc71898f31e025f08338c6ca4da.zip | |
rpmsg: glink: Fail qcom_glink_tx() once remove has been initiated
Upon removing the glink edge, communication is at best one-way. This
means that the very common scenario of glink requesting intents will not
be possible to serve.
Typically a successful transmission results in the client waiting for a
response, with some timeout and a mechanism for aborting that timeout.
Because of this, once the glink edge is defunct once removal is
commenced it's better to fail transmissions fast.
Reviewed-by: Chris Lew <quic_clew@quicinc.com>
Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230213155215.1237059-6-quic_bjorande@quicinc.com
Diffstat (limited to 'drivers/rpmsg')
| -rw-r--r-- | drivers/rpmsg/qcom_glink_native.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c index 8dd8cf033b2d..946128c343f3 100644 --- a/drivers/rpmsg/qcom_glink_native.c +++ b/drivers/rpmsg/qcom_glink_native.c @@ -90,6 +90,7 @@ struct glink_core_rx_intent { * @intentless: flag to indicate that there is no intent * @tx_avail_notify: Waitqueue for pending tx tasks * @sent_read_notify: flag to check cmd sent or not + * @abort_tx: flag indicating that all tx attempts should fail */ struct qcom_glink { struct device *dev; @@ -111,6 +112,8 @@ struct qcom_glink { bool intentless; wait_queue_head_t tx_avail_notify; bool sent_read_notify; + + bool abort_tx; }; enum { @@ -326,12 +329,22 @@ static int qcom_glink_tx(struct qcom_glink *glink, spin_lock_irqsave(&glink->tx_lock, flags); + if (glink->abort_tx) { + ret = -EIO; + goto out; + } + while (qcom_glink_tx_avail(glink) < tlen) { if (!wait) { ret = -EAGAIN; goto out; } + if (glink->abort_tx) { + ret = -EIO; + goto out; + } + if (!glink->sent_read_notify) { glink->sent_read_notify = true; qcom_glink_send_read_notify(glink); @@ -1763,11 +1776,18 @@ static int qcom_glink_remove_device(struct device *dev, void *data) void qcom_glink_native_remove(struct qcom_glink *glink) { struct glink_channel *channel; + unsigned long flags; int cid; int ret; qcom_glink_cancel_rx_work(glink); + /* Fail all attempts at sending messages */ + spin_lock_irqsave(&glink->tx_lock, flags); + glink->abort_tx = true; + wake_up_all(&glink->tx_avail_notify); + spin_unlock_irqrestore(&glink->tx_lock, flags); + ret = device_for_each_child(glink->dev, NULL, qcom_glink_remove_device); if (ret) dev_warn(glink->dev, "Can't remove GLINK devices: %d\n", ret); |