diff options
| author | Stephan Gerhold <stephan@gerhold.net> | 2023-06-15 18:50:41 +0200 |
|---|---|---|
| committer | Bjorn Andersson <andersson@kernel.org> | 2023-07-13 22:18:56 -0700 |
| commit | 181563be4373e70bfab82773e3fce571edea9629 (patch) | |
| tree | 7a204e854b8e815873a9258b4c8ca16ea9bc308e /drivers/rpmsg | |
| parent | 4dbb9e2322a3a9c912ce796c20c27045ae8dae22 (diff) | |
| download | lwn-181563be4373e70bfab82773e3fce571edea9629.tar.gz lwn-181563be4373e70bfab82773e3fce571edea9629.zip | |
rpmsg: qcom_smd: Use qcom_smem_is_available()
Rather than looking up a dummy item from SMEM, use the new
qcom_smem_is_available() function to make the code more clear
(and reduce the overhead slightly).
Add the same check to qcom_smd_register_edge() as well to ensure that
it only succeeds if SMEM is already available - if a driver calls the
function and SMEM is not available yet then the initial state will be
read incorrectly and the RPMSG devices might never become available.
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Link: https://lore.kernel.org/r/20230531-rpm-rproc-v3-8-a07dcdefd918@gerhold.net
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Diffstat (limited to 'drivers/rpmsg')
| -rw-r--r-- | drivers/rpmsg/qcom_smd.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/rpmsg/qcom_smd.c b/drivers/rpmsg/qcom_smd.c index 7b9c298aa491..43f601c84b4f 100644 --- a/drivers/rpmsg/qcom_smd.c +++ b/drivers/rpmsg/qcom_smd.c @@ -1479,6 +1479,9 @@ struct qcom_smd_edge *qcom_smd_register_edge(struct device *parent, struct qcom_smd_edge *edge; int ret; + if (!qcom_smem_is_available()) + return ERR_PTR(-EPROBE_DEFER); + edge = kzalloc(sizeof(*edge), GFP_KERNEL); if (!edge) return ERR_PTR(-ENOMEM); @@ -1553,12 +1556,9 @@ EXPORT_SYMBOL(qcom_smd_unregister_edge); static int qcom_smd_probe(struct platform_device *pdev) { struct device_node *node; - void *p; - /* Wait for smem */ - p = qcom_smem_get(QCOM_SMEM_HOST_ANY, smem_items[0].alloc_tbl_id, NULL); - if (PTR_ERR(p) == -EPROBE_DEFER) - return PTR_ERR(p); + if (!qcom_smem_is_available()) + return -EPROBE_DEFER; for_each_available_child_of_node(pdev->dev.of_node, node) qcom_smd_register_edge(&pdev->dev, node); |