From: Tanmay Shah <tanmay.shah@amd.com>
Date: Fri, 10 Mar 2023 17:24:04 -0800
Subject: [PATCH] mailbox: zynqmp: Fix counts of child nodes
References: bsc#1012628
Patch-mainline: 6.3.2
Git-commit: f72f805e72882c361e2a612c64a6e549f3da7152
commit f72f805e72882c361e2a612c64a6e549f3da7152 upstream.
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: 4981b82ba2ff ("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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
drivers/mailbox/zynqmp-ipi-mailbox.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/mailbox/zynqmp-ipi-mailbox.c b/drivers/mailbox/zynqmp-ipi-mailbox.c
index 29f09ded..d097f45b 100644
--- a/drivers/mailbox/zynqmp-ipi-mailbox.c
+++ b/drivers/mailbox/zynqmp-ipi-mailbox.c
@@ -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)
--
2.35.3