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authorBjorn Andersson <quic_bjorande@quicinc.com>2023-02-13 18:52:14 +0300
committerBjorn Andersson <andersson@kernel.org>2023-02-14 19:19:38 +0300
commit9c96bacf1af51bc71898f31e025f08338c6ca4da (patch)
treec2daaa7ef80fa8e00961641c381bcd6797f9d215 /drivers/rpmsg
parentf424d1cbe8c7ef78a4b639502fa9904c4198387b (diff)
downloadlinux-9c96bacf1af51bc71898f31e025f08338c6ca4da.tar.xz
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.c20
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);