2021-06-15 02:25:28

by Siddharth Gupta

Subject: [PATCH v3 3/4] remoteproc: core: Fix cdev remove and rproc del

The rproc_char_device_remove() call currently unmaps the cdev
region instead of simply deleting the cdev that was added as a
part of the rproc_char_device_add() call. This change fixes that
behaviour, and also fixes the order in which device_del() and
cdev_del() need to be called.

Signed-off-by: Siddharth Gupta <[email protected]>
---
drivers/remoteproc/remoteproc_cdev.c | 2 +-
drivers/remoteproc/remoteproc_core.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/remoteproc/remoteproc_cdev.c b/drivers/remoteproc/remoteproc_cdev.c
index 0b8a84c..4ad98b0 100644
--- a/drivers/remoteproc/remoteproc_cdev.c
+++ b/drivers/remoteproc/remoteproc_cdev.c
@@ -124,7 +124,7 @@ int rproc_char_device_add(struct rproc *rproc)

void rproc_char_device_remove(struct rproc *rproc)
{
- __unregister_chrdev(MAJOR(rproc->dev.devt), rproc->index, 1, "remoteproc");
+ cdev_del(&rproc->cdev);
}

void __init rproc_init_cdev(void)
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index b65fce3..b874280 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -2619,7 +2619,6 @@ int rproc_del(struct rproc *rproc)
mutex_unlock(&rproc->lock);

rproc_delete_debug_dir(rproc);
- rproc_char_device_remove(rproc);

/* the rproc is downref'ed as soon as it's removed from the klist */
mutex_lock(&rproc_list_mutex);
@@ -2630,6 +2629,7 @@ int rproc_del(struct rproc *rproc)
synchronize_rcu();

device_del(&rproc->dev);
+ rproc_char_device_remove(rproc);

return 0;
}
--
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a Linux Foundation Collaborative Project

2021-06-15 04:56:09

by Greg KH

Subject: Re: [PATCH v3 3/4] remoteproc: core: Fix cdev remove and rproc del

On Mon, Jun 14, 2021 at 07:21:10PM -0700, Siddharth Gupta wrote:
> The rproc_char_device_remove() call currently unmaps the cdev
> region instead of simply deleting the cdev that was added as a
> part of the rproc_char_device_add() call. This change fixes that
> behaviour, and also fixes the order in which device_del() and
> cdev_del() need to be called.
>
> Signed-off-by: Siddharth Gupta <[email protected]>
> ---
> drivers/remoteproc/remoteproc_cdev.c | 2 +-
> drivers/remoteproc/remoteproc_core.c | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree. Please read:
https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>