4.19-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit cec83ff1241ec98113a19385ea9e9cfa9aa4125b ]
While playing with initialization order of modem device, it has been discovered that under some circumstances (early console init, I believe) its .pm() callback may be called before the uart_port->private_data pointer is initialized from plat_serial8250_port->private_data, resulting in NULL pointer dereference. Fix it by checking for uninitialized pointer before using it in modem_pm().
Fixes: aabf31737a6a ("ARM: OMAP1: ams-delta: update the modem to use regulator API") Signed-off-by: Janusz Krzysztofik jmkrzyszt@gmail.com Signed-off-by: Tony Lindgren tony@atomide.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/arm/mach-omap1/board-ams-delta.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/arch/arm/mach-omap1/board-ams-delta.c b/arch/arm/mach-omap1/board-ams-delta.c index dd28d2614d7f..d10d8831f527 100644 --- a/arch/arm/mach-omap1/board-ams-delta.c +++ b/arch/arm/mach-omap1/board-ams-delta.c @@ -726,6 +726,9 @@ static void modem_pm(struct uart_port *port, unsigned int state, unsigned old) struct modem_private_data *priv = port->private_data; int ret;
+ if (!priv) + return; + if (IS_ERR(priv->regulator)) return;