This is a note to let you know that I've just added the patch titled
firmware: arm_scmi: Fix deferred_tx_wq release on error paths
to the 6.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
firmware-arm_scmi-fix-deferred_tx_wq-release-on-erro.patch
and it can be found in the queue-6.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 3f12f44328d773dcf6c8e09443b4fc7f84a564ba
Author: Cristian Marussi <cristian.marussi@xxxxxxx>
Date: Fri Oct 28 15:08:31 2022 +0100
firmware: arm_scmi: Fix deferred_tx_wq release on error paths
[ Upstream commit 1eff6929aff594fba3182660f7b6213ec0ceda0c ]
Use devres to allocate the dedicated deferred_tx_wq polling workqueue so
as to automatically trigger the proper resource release on error path.
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Fixes: 5a3b7185c47c ("firmware: arm_scmi: Add atomic mode support to virtio transport")
Signed-off-by: Cristian Marussi <cristian.marussi@xxxxxxx>
Link: https://lore.kernel.org/r/20221028140833.280091-6-cristian.marussi@xxxxxxx
Signed-off-by: Sudeep Holla <sudeep.holla@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/firmware/arm_scmi/virtio.c b/drivers/firmware/arm_scmi/virtio.c
index 36b7686843a4..33c9b81a55cd 100644
--- a/drivers/firmware/arm_scmi/virtio.c
+++ b/drivers/firmware/arm_scmi/virtio.c
@@ -148,7 +148,6 @@ static void scmi_vio_channel_cleanup_sync(struct scmi_vio_channel *vioch)
{
unsigned long flags;
DECLARE_COMPLETION_ONSTACK(vioch_shutdown_done);
- void *deferred_wq = NULL;
/*
* Prepare to wait for the last release if not already released
@@ -162,16 +161,11 @@ static void scmi_vio_channel_cleanup_sync(struct scmi_vio_channel *vioch)
vioch->shutdown_done = &vioch_shutdown_done;
virtio_break_device(vioch->vqueue->vdev);
- if (!vioch->is_rx && vioch->deferred_tx_wq) {
- deferred_wq = vioch->deferred_tx_wq;
+ if (!vioch->is_rx && vioch->deferred_tx_wq)
/* Cannot be kicked anymore after this...*/
vioch->deferred_tx_wq = NULL;
- }
spin_unlock_irqrestore(&vioch->lock, flags);
- if (deferred_wq)
- destroy_workqueue(deferred_wq);
-
scmi_vio_channel_release(vioch);
/* Let any possibly concurrent RX path release the channel */
@@ -416,6 +410,11 @@ static bool virtio_chan_available(struct device *dev, int idx)
return vioch && !vioch->cinfo;
}
+static void scmi_destroy_tx_workqueue(void *deferred_tx_wq)
+{
+ destroy_workqueue(deferred_tx_wq);
+}
+
static int virtio_chan_setup(struct scmi_chan_info *cinfo, struct device *dev,
bool tx)
{
@@ -430,6 +429,8 @@ static int virtio_chan_setup(struct scmi_chan_info *cinfo, struct device *dev,
/* Setup a deferred worker for polling. */
if (tx && !vioch->deferred_tx_wq) {
+ int ret;
+
vioch->deferred_tx_wq =
alloc_workqueue(dev_name(&scmi_vdev->dev),
WQ_UNBOUND | WQ_FREEZABLE | WQ_SYSFS,
@@ -437,6 +438,11 @@ static int virtio_chan_setup(struct scmi_chan_info *cinfo, struct device *dev,
if (!vioch->deferred_tx_wq)
return -ENOMEM;
+ ret = devm_add_action_or_reset(dev, scmi_destroy_tx_workqueue,
+ vioch->deferred_tx_wq);
+ if (ret)
+ return ret;
+
INIT_WORK(&vioch->deferred_tx_work,
scmi_vio_deferred_tx_worker);
}
