3.16.7-ckt23 -stable review patch. If anyone has any objections, please let me know.
---8<------------------------------------------------------------
From: Wang Dongsheng <dongsheng.wang@xxxxxxxxxxxxx>
commit acfc1cc13fe5bc6d7a10afa624f1e560850ddad3 upstream.
If diu_ops is not implemented on platform, kernel will access a NULL
pointer. We need to check this pointer in DIU initialization.
Signed-off-by: Wang Dongsheng <dongsheng.wang@xxxxxxxxxxxxx>
Acked-by: Timur Tabi <timur@xxxxxxxx>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
drivers/video/fbdev/fsl-diu-fb.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/video/fbdev/fsl-diu-fb.c b/drivers/video/fbdev/fsl-diu-fb.c
index e8758b9c3bcc..7b1fa06f4b72 100644
--- a/drivers/video/fbdev/fsl-diu-fb.c
+++ b/drivers/video/fbdev/fsl-diu-fb.c
@@ -479,7 +479,10 @@ static enum fsl_diu_monitor_port fsl_diu_name_to_port(const char *s)
port = FSL_DIU_PORT_DLVDS;
}
- return diu_ops.valid_monitor_port(port);
+ if (diu_ops.valid_monitor_port)
+ port = diu_ops.valid_monitor_port(port);
+
+ return port;
}
/*
@@ -1909,6 +1912,14 @@ static int __init fsl_diu_init(void)
#else
monitor_port = fsl_diu_name_to_port(monitor_string);
#endif
+
+ /*
+ * Must to verify set_pixel_clock. If not implement on platform,
+ * then that means that there is no platform support for the DIU.
+ */
+ if (!diu_ops.set_pixel_clock)
+ return -ENODEV;
+
pr_info("Freescale Display Interface Unit (DIU) framebuffer driver\n");
#ifdef CONFIG_NOT_COHERENT_CACHE
--
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