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mailbox: zynqmp: Fix counts of child nodes

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[ Upstream commit f72f805e72882c361e2a612c64a6e549f3da7152 ]

If child mailbox node status is disabled it causes
crash in interrupt handler. Fix this by assigning
only available child node during driver probe.

Fixes: 4981b82ba2 ("mailbox: ZynqMP IPI mailbox controller")
Signed-off-by: Tanmay Shah <tanmay.shah@amd.com>
Acked-by: Michal Simek <michal.simek@amd.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20230311012407.1292118-2-tanmay.shah@amd.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Tanmay Shah 2023-03-10 17:24:04 -08:00 committed by Greg Kroah-Hartman
parent ff0d64f512
commit e4875d6e05
1 changed files with 6 additions and 1 deletions
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7
drivers/mailbox/zynqmp-ipi-mailbox.c
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@ -634,7 +634,12 @@ static int zynqmp_ipi_probe(struct platform_device *pdev)
struct zynqmp_ipi_mbox *mbox;
int num_mboxes, ret = -EINVAL;
num_mboxes = of_get_child_count(np);
num_mboxes = of_get_available_child_count(np);
if (num_mboxes == 0) {
dev_err(dev, "mailbox nodes not available\n");
return -EINVAL;
}
pdata = devm_kzalloc(dev, struct_size(pdata, ipi_mboxes, num_mboxes),
GFP_KERNEL);
if (!pdata)