* [PATCH v2 2/2] remoteproc: Drop firmware_loading_complete
2017-01-24 1:53 [PATCH v2 1/2] remoteproc: Add RPROC_DELETED state Sarangdhar Joshi
@ 2017-01-24 1:53 ` Sarangdhar Joshi
0 siblings, 0 replies; 2+ messages in thread
From: Sarangdhar Joshi @ 2017-01-24 1:53 UTC (permalink / raw)
To: linux-arm-kernel
firmware_loading_complete is used to synchronize operations
on rproc while asynchronous firmware loading is in progress.
However, rproc_boot() no longer waits on
firmware_loading_complete. Hence drop this completion
variable altogether and handle the race between rproc_del()
and rproc_boot() using new state RPROC_DELETED.
The request_firmware_nowait() will hold the reference to
rproc device by using a get_device()/put_device(), so the
rproc struct will remain valid even when we return from
rproc_del() before the asynchronous call to
rproc_fw_config_virtio() completes.
CC: Loic Pallardy <loic.pallardy@st.com>
CC: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Sarangdhar Joshi <spjoshi@codeaurora.org>
---
The current patch series is a v2 version of original patch listed at
https://lkml.org/lkml/2016/12/16/534
Changes from v1:
* Add new RPROC_DELETED state
* Use the new state RPROC_DELETED to handle race between rproc_del()
and rproc_boot()
drivers/remoteproc/remoteproc_core.c | 22 +++++++++++-----------
include/linux/remoteproc.h | 2 --
2 files changed, 11 insertions(+), 13 deletions(-)
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 78200a7..f58e634 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -975,17 +975,12 @@ static void rproc_fw_config_virtio(const struct firmware *fw, void *context)
rproc_boot(rproc);
release_firmware(fw);
- /* allow rproc_del() contexts, if any, to proceed */
- complete_all(&rproc->firmware_loading_complete);
}
static int rproc_add_virtio_devices(struct rproc *rproc)
{
int ret;
- /* rproc_del() calls must wait until async loader completes */
- init_completion(&rproc->firmware_loading_complete);
-
/*
* We must retrieve early virtio configuration info from
* the firmware (e.g. whether to register a virtio device,
@@ -997,10 +992,8 @@ static int rproc_add_virtio_devices(struct rproc *rproc)
ret = request_firmware_nowait(THIS_MODULE, FW_ACTION_HOTPLUG,
rproc->firmware, &rproc->dev, GFP_KERNEL,
rproc, rproc_fw_config_virtio);
- if (ret < 0) {
+ if (ret < 0)
dev_err(&rproc->dev, "request_firmware_nowait err: %d\n", ret);
- complete_all(&rproc->firmware_loading_complete);
- }
return ret;
}
@@ -1097,6 +1090,12 @@ static int __rproc_boot(struct rproc *rproc)
return ret;
}
+ if (rproc->state == RPROC_DELETED) {
+ ret = -ENODEV;
+ dev_err(dev, "can't boot deleted rproc %s\n", rproc->name);
+ goto unlock_mutex;
+ }
+
/* skip the boot process if rproc is already powered up */
if (atomic_inc_return(&rproc->power) > 1) {
ret = 0;
@@ -1481,14 +1480,15 @@ int rproc_del(struct rproc *rproc)
if (!rproc)
return -EINVAL;
- /* if rproc is just being registered, wait */
- wait_for_completion(&rproc->firmware_loading_complete);
-
/* if rproc is marked always-on, rproc_add() booted it */
/* TODO: make sure this works with rproc->power > 1 */
if (rproc->auto_boot)
rproc_shutdown(rproc);
+ mutex_lock(&rproc->lock);
+ rproc->state = RPROC_DELETED;
+ mutex_unlock(&rproc->lock);
+
rproc_delete_debug_dir(rproc);
/* the rproc is downref'ed as soon as it's removed from the klist */
diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index 25a8c37..26328c4 100644
--- a/include/linux/remoteproc.h
+++ b/include/linux/remoteproc.h
@@ -399,7 +399,6 @@ enum rproc_crash_type {
* @num_traces: number of trace buffers
* @carveouts: list of physically contiguous memory allocations
* @mappings: list of iommu mappings we initiated, needed on shutdown
- * @firmware_loading_complete: marks e/o asynchronous firmware loading
* @bootaddr: address of first instruction to boot rproc with (optional)
* @rvdevs: list of remote virtio devices
* @subdevs: list of subdevices, to following the running state
@@ -430,7 +429,6 @@ struct rproc {
int num_traces;
struct list_head carveouts;
struct list_head mappings;
- struct completion firmware_loading_complete;
u32 bootaddr;
struct list_head rvdevs;
struct list_head subdevs;
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
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