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rpmsg: qcom_smd: Use qcom_smem_is_available()

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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>
This commit is contained in:
Stephan Gerhold 2023-06-15 18:50:41 +02:00 committed by Bjorn Andersson
parent 4dbb9e2322
commit 181563be43
1 changed files with 5 additions and 5 deletions
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10
drivers/rpmsg/qcom_smd.c
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@ -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);