remoteproc: Fix IDR initialisation in rproc_alloc()

[ Upstream commit 6442df49400b466431979e7634849a464a5f1861 ]

If ida_simple_get() returns an error when called in rproc_alloc(),
put_device() is called to clean things up.  By this time the rproc
device type has been assigned, with rproc_type_release() as the
release function.

The first thing rproc_type_release() does is call:
    idr_destroy(&rproc->notifyids);

But at the time the ida_simple_get() call is made, the notifyids
field in the remoteproc structure has not been initialized.

I'm not actually sure this case causes an observable problem, but
it's incorrect.  Fix this by initializing the notifyids field before
calling ida_simple_get() in rproc_alloc().

Fixes: b5ab5e24e960 ("remoteproc: maintain a generic child device for each rproc")
Signed-off-by: Alex Elder <elder@linaro.org>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Suman Anna <s-anna@ti.com>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20200415204858.2448-2-mathieu.poirier@linaro.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index be15aace9b3c88c839078f1c47296c1aa4854a01..8f79cfd2e467822a597a25e17f7f36b68937404c 100644 (file)
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -2053,6 +2053,7 @@ struct rproc *rproc_alloc(struct device *dev, const char *name,
        rproc->dev.type = &rproc_type;
        rproc->dev.class = &rproc_class;
        rproc->dev.driver_data = rproc;
+       idr_init(&rproc->notifyids);
 
        /* Assign a unique device index and name */
        rproc->index = ida_simple_get(&rproc_dev_index, 0, 0, GFP_KERNEL);
@@ -2078,8 +2079,6 @@ struct rproc *rproc_alloc(struct device *dev, const char *name,
 
        mutex_init(&rproc->lock);
 
-       idr_init(&rproc->notifyids);
-
        INIT_LIST_HEAD(&rproc->carveouts);
        INIT_LIST_HEAD(&rproc->mappings);
        INIT_LIST_HEAD(&rproc->traces);