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remoteproc: Drop firmware_loading_complete

Browse source 
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 <[email protected]>
CC: Bjorn Andersson <[email protected]>
Signed-off-by: Sarangdhar Joshi <[email protected]>
Signed-off-by: Bjorn Andersson <[email protected]>
This commit is contained in:
Sarangdhar Joshi 2017-01-23 17:53:19 -08:00 • committed by Bjorn Andersson
commit 2099c77d4a
2 changed files with 11 additions and 13 deletions
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22
drivers/remoteproc/remoteproc_core.c
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@ -977,17 +977,12 @@ 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,
@ -999,10 +994,8 @@ 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;
}
@ -1099,6 +1092,12 @@ 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 */