* [PATCH] remoteproc: Fix potential race condition in rproc_add
@ 2016-05-25 20:41 ` Dave Gerlach
0 siblings, 0 replies; 3+ messages in thread
From: Dave Gerlach @ 2016-05-25 20:41 UTC (permalink / raw)
To: linux-kernel, linux-remoteproc
Cc: Bjorn Andersson, Ohad Ben-Cohen, Suman Anna, Dave Gerlach
rproc_add adds the newly created remoteproc to a list for use by
rproc_get_by_phandle and then does some additional processing to finish
adding the remoteproc. This leaves a small window of time in which the
rproc is available in the list but not yet fully initialized, so if
another driver comes along and gets a handle to the rproc, it will be
invalid. Rearrange the code in rproc_add to make sure the rproc is added
to the list only after it has been successfuly initialized.
Fixes: fec47d863587 ("remoteproc: introduce rproc_get_by_phandle API")
Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
---
drivers/remoteproc/remoteproc_core.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index db3958b3f094..fe0539ed9cb5 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -1264,11 +1264,6 @@ int rproc_add(struct rproc *rproc)
if (ret < 0)
return ret;
- /* expose to rproc_get_by_phandle users */
- mutex_lock(&rproc_list_mutex);
- list_add(&rproc->node, &rproc_list);
- mutex_unlock(&rproc_list_mutex);
-
dev_info(dev, "%s is available\n", rproc->name);
dev_info(dev, "Note: remoteproc is still under development and considered experimental.\n");
@@ -1276,8 +1271,16 @@ int rproc_add(struct rproc *rproc)
/* create debugfs entries */
rproc_create_debug_dir(rproc);
+ ret = rproc_add_virtio_devices(rproc);
+ if (ret < 0)
+ return ret;
- return rproc_add_virtio_devices(rproc);
+ /* expose to rproc_get_by_phandle users */
+ mutex_lock(&rproc_list_mutex);
+ list_add(&rproc->node, &rproc_list);
+ mutex_unlock(&rproc_list_mutex);
+
+ return 0;
}
EXPORT_SYMBOL(rproc_add);
--
2.8.3
^ permalink raw reply related [flat|nested] 3+ messages in thread
* [PATCH] remoteproc: Fix potential race condition in rproc_add
@ 2016-05-25 20:41 ` Dave Gerlach
0 siblings, 0 replies; 3+ messages in thread
From: Dave Gerlach @ 2016-05-25 20:41 UTC (permalink / raw)
To: linux-kernel, linux-remoteproc
Cc: Bjorn Andersson, Ohad Ben-Cohen, Suman Anna, Dave Gerlach
rproc_add adds the newly created remoteproc to a list for use by
rproc_get_by_phandle and then does some additional processing to finish
adding the remoteproc. This leaves a small window of time in which the
rproc is available in the list but not yet fully initialized, so if
another driver comes along and gets a handle to the rproc, it will be
invalid. Rearrange the code in rproc_add to make sure the rproc is added
to the list only after it has been successfuly initialized.
Fixes: fec47d863587 ("remoteproc: introduce rproc_get_by_phandle API")
Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
---
drivers/remoteproc/remoteproc_core.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index db3958b3f094..fe0539ed9cb5 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -1264,11 +1264,6 @@ int rproc_add(struct rproc *rproc)
if (ret < 0)
return ret;
- /* expose to rproc_get_by_phandle users */
- mutex_lock(&rproc_list_mutex);
- list_add(&rproc->node, &rproc_list);
- mutex_unlock(&rproc_list_mutex);
-
dev_info(dev, "%s is available\n", rproc->name);
dev_info(dev, "Note: remoteproc is still under development and considered experimental.\n");
@@ -1276,8 +1271,16 @@ int rproc_add(struct rproc *rproc)
/* create debugfs entries */
rproc_create_debug_dir(rproc);
+ ret = rproc_add_virtio_devices(rproc);
+ if (ret < 0)
+ return ret;
- return rproc_add_virtio_devices(rproc);
+ /* expose to rproc_get_by_phandle users */
+ mutex_lock(&rproc_list_mutex);
+ list_add(&rproc->node, &rproc_list);
+ mutex_unlock(&rproc_list_mutex);
+
+ return 0;
}
EXPORT_SYMBOL(rproc_add);
--
2.8.3
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] remoteproc: Fix potential race condition in rproc_add
2016-05-25 20:41 ` Dave Gerlach
(?)
@ 2016-06-14 18:34 ` Bjorn Andersson
-1 siblings, 0 replies; 3+ messages in thread
From: Bjorn Andersson @ 2016-06-14 18:34 UTC (permalink / raw)
To: Dave Gerlach; +Cc: linux-kernel, linux-remoteproc, Ohad Ben-Cohen, Suman Anna
On Wed 25 May 13:41 PDT 2016, Dave Gerlach wrote:
> rproc_add adds the newly created remoteproc to a list for use by
> rproc_get_by_phandle and then does some additional processing to finish
> adding the remoteproc. This leaves a small window of time in which the
> rproc is available in the list but not yet fully initialized, so if
> another driver comes along and gets a handle to the rproc, it will be
> invalid. Rearrange the code in rproc_add to make sure the rproc is added
> to the list only after it has been successfuly initialized.
>
> Fixes: fec47d863587 ("remoteproc: introduce rproc_get_by_phandle API")
> Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
Applied and added Cc: stable.
Regards,
Bjorn
> ---
> drivers/remoteproc/remoteproc_core.c | 15 +++++++++------
> 1 file changed, 9 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index db3958b3f094..fe0539ed9cb5 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -1264,11 +1264,6 @@ int rproc_add(struct rproc *rproc)
> if (ret < 0)
> return ret;
>
> - /* expose to rproc_get_by_phandle users */
> - mutex_lock(&rproc_list_mutex);
> - list_add(&rproc->node, &rproc_list);
> - mutex_unlock(&rproc_list_mutex);
> -
> dev_info(dev, "%s is available\n", rproc->name);
>
> dev_info(dev, "Note: remoteproc is still under development and considered experimental.\n");
> @@ -1276,8 +1271,16 @@ int rproc_add(struct rproc *rproc)
>
> /* create debugfs entries */
> rproc_create_debug_dir(rproc);
> + ret = rproc_add_virtio_devices(rproc);
> + if (ret < 0)
> + return ret;
>
> - return rproc_add_virtio_devices(rproc);
> + /* expose to rproc_get_by_phandle users */
> + mutex_lock(&rproc_list_mutex);
> + list_add(&rproc->node, &rproc_list);
> + mutex_unlock(&rproc_list_mutex);
> +
> + return 0;
> }
> EXPORT_SYMBOL(rproc_add);
>
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2016-06-14 18:34 UTC | newest]
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2016-05-25 20:41 [PATCH] remoteproc: Fix potential race condition in rproc_add Dave Gerlach
2016-05-25 20:41 ` Dave Gerlach
2016-06-14 18:34 ` Bjorn Andersson
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