[PATCH 5.13 174/351] remoteproc: core: Fix cdev remove and rproc del

Greg Kroah-Hartman
2021-07-19T17:35:09Z

From: Siddharth Gupta <sidgup@codeaurora.org>

[ Upstream commit 930eec0be20c93a53160c74005a1485a230e6911 ]

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 <sidgup@codeaurora.org>
Link: https://lore.kernel.org/r/1623723671-5517-4-git-send-email-sidgup@codeaurora.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 0b8a84c04f76..4ad98b0b8caa 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 626a6b90fba2..203e2bd8ebb4 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -2602,7 +2602,6 @@ 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);
@@ -2613,6 +2612,7 @@ int rproc_del(struct rproc *rproc)
synchronize_rcu();

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

return 0;
}
--
2.30.2