mailbox: imx: fix crash in resume on i.mx8ulp

[ Upstream commit 8219efd08a0aa1d7944bdb66d84ba57549258968 ]

check 'priv->clk' before 'imx_mu_read()' otherwise crash happens on
i.mx8ulp, since clock not enabled.

Fixes: 4f0b776ef5831 ("mailbox: imx-mailbox: support i.MX8ULP MU")
Reviewed-by: Jacky Bai <ping.bai@nxp.com>
Signed-off-by: Robin Gong <yibin.gong@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/mailbox/imx-mailbox.c b/drivers/mailbox/imx-mailbox.c
index 0ce75c6b36b65899bce537e1d549360debaf77c3..2aeef0bc69308eb01a689cde47a6966076746fa9 100644 (file)
--- a/drivers/mailbox/imx-mailbox.c
+++ b/drivers/mailbox/imx-mailbox.c
@@ -668,7 +668,7 @@ static int __maybe_unused imx_mu_resume_noirq(struct device *dev)
         * send failed, may lead to system freeze. This issue
         * is observed by testing freeze mode suspend.
         */
-       if (!imx_mu_read(priv, priv->dcfg->xCR[0]) && !priv->clk) {
+       if (!priv->clk && !imx_mu_read(priv, priv->dcfg->xCR[0])) {
                for (i = 0; i < IMX_MU_xCR_MAX; i++)
                        imx_mu_write(priv, priv->xcr[i], priv->dcfg->xCR[i]);
        }