diff options
| author | Dave Gerlach <d-gerlach@ti.com> | 2016-05-25 15:41:28 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-08-20 18:09:20 +0200 |
| commit | 3633bd8220a778e41de3e75930aa21f8a51a1629 (patch) | |
| tree | 310d66bed2eb3eeab644a0a9f997304160e9e7c7 /drivers/remoteproc | |
| parent | 54c4ddcbab7396c58e1fc745663417ad7e872137 (diff) | |
remoteproc: Fix potential race condition in rproc_add
commit d2e12e66a939c54ed84e5f1b6947f0c45f6c56eb upstream.
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>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/remoteproc')
| -rw-r--r-- | drivers/remoteproc/remoteproc_core.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c index 9e03d158f411..4f7ce0097191 100644 --- a/drivers/remoteproc/remoteproc_core.c +++ b/drivers/remoteproc/remoteproc_core.c @@ -1239,11 +1239,6 @@ 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"); @@ -1251,8 +1246,16 @@ 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); |