linux-kernel - [PATCH V2 2/2] mailbox: tegra: avoid resume NULL mailboxes

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Date:   Fri, 14 Jun 2019 09:31:01 -0700
From:   Bitan Biswas <bbiswas@...dia.com>
To:     Jassi Brar <jassisinghbrar@...il.com>,
        Thierry Reding <treding@...dia.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        <linux-kernel@...r.kernel.org>, <linux-tegra@...r.kernel.org>
CC:     Bitan Biswas <bbiswas@...dia.com>
Subject: [PATCH V2 2/2] mailbox: tegra: avoid resume NULL mailboxes

If Tegra HSP device tree does not have 'shared irqs',
mailboxes pointer is NULL. Add non-NULL HSP mailboxes
check in resume callback before tegra_hsp_mailbox_startup()
call and prevent NULL pointer exception.

Signed-off-by: Bitan Biswas <bbiswas@...dia.com>
---
 drivers/mailbox/tegra-hsp.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/mailbox/tegra-hsp.c b/drivers/mailbox/tegra-hsp.c
index 91e223e..4c5ba35 100644
--- a/drivers/mailbox/tegra-hsp.c
+++ b/drivers/mailbox/tegra-hsp.c
@@ -782,11 +782,13 @@ static int __maybe_unused tegra_hsp_resume(struct device *dev)
 			tegra_hsp_doorbell_startup(db->channel.chan);
 	}
 
-	for (i = 0; i < hsp->num_sm; i++) {
-		struct tegra_hsp_mailbox *mb = &hsp->mailboxes[i];
+	if (hsp->mailboxes) {
+		for (i = 0; i < hsp->num_sm; i++) {
+			struct tegra_hsp_mailbox *mb = &hsp->mailboxes[i];
 
-		if (mb->channel.chan->cl)
-			tegra_hsp_mailbox_startup(mb->channel.chan);
+			if (mb->channel.chan->cl)
+				tegra_hsp_mailbox_startup(mb->channel.chan);
+		}
 	}
 
 	return 0;
-- 
2.7.4