[PATCH v2] memory: mtk-smi: Fix a null dereference for the ostd

[Yong Wu <yong.wu@mediatek.com>]

We add the ostd setting for mt8195. It introduces a KE for the
previous SoC which doesn't have ostd setting. This is the log:

Unable to handle kernel NULL pointer dereference at virtual address
0000000000000080
...
pc : mtk_smi_larb_config_port_gen2_general+0x64/0x130
lr : mtk_smi_larb_resume+0x54/0x98
...
Call trace:
 mtk_smi_larb_config_port_gen2_general+0x64/0x130
 pm_generic_runtime_resume+0x2c/0x48
 __genpd_runtime_resume+0x30/0xa8
 genpd_runtime_resume+0x94/0x2c8
 __rpm_callback+0x44/0x150
 rpm_callback+0x6c/0x78
 rpm_resume+0x310/0x558
 __pm_runtime_resume+0x3c/0x88

In the code: larbostd = larb->larb_gen->ostd[larb->larbid],
if "larb->larb_gen->ostd" is null, the "larbostd" is the offset(e.g.
0x80 above), it's also a valid value, then accessing "larbostd[i]" in the
"for" loop will cause the KE above. To avoid this issue, initialize
"larbostd" to NULL when the SoC doesn't have ostd setting.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
---
change note: Reword the commit message to show why it KE. and update the
solution via initializing "larbostd" is NULL explicitly in the non-ostd
case.
---
 drivers/memory/mtk-smi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
index b883dcc0bbfa..e201e5976f34 100644
--- a/drivers/memory/mtk-smi.c
+++ b/drivers/memory/mtk-smi.c
@@ -241,7 +241,7 @@ static void mtk_smi_larb_config_port_gen2_general(struct device *dev)
 {
 	struct mtk_smi_larb *larb = dev_get_drvdata(dev);
 	u32 reg, flags_general = larb->larb_gen->flags_general;
-	const u8 *larbostd = larb->larb_gen->ostd[larb->larbid];
+	const u8 *larbostd = larb->larb_gen->ostd ? larb->larb_gen->ostd[larb->larbid] : NULL;
 	int i;
 
 	if (BIT(larb->larbid) & larb->larb_gen->larb_direct_to_common_mask)
-- 
2.18.0