diff options
| author |   Wang Dongsheng <dongsheng.wang@freescale.com> | 2015-12-03 09:54:12 +0800 |
|---|---|---|
| committer |   Tomi Valkeinen <tomi.valkeinen@ti.com> | 2015-12-09 12:57:06 +0200 |
| commit | acfc1cc13fe5bc6d7a10afa624f1e560850ddad3 (patch) | |
| tree | fa36f51432baaa22020a1d8d0da4ea034db9d817 /drivers/video/fbdev/fsl-diu-fb.c | |
| parent | Linux 4.4-rc4 (diff) | |
| download | linux-dev-acfc1cc13fe5bc6d7a10afa624f1e560850ddad3.tar.xz linux-dev-acfc1cc13fe5bc6d7a10afa624f1e560850ddad3.zip | |
video: fbdev: fsl: Fix kernel crash when diu_ops is not implemented
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@freescale.com>
Acked-by: Timur Tabi <timur@tabi.org>
Cc: stable@vger.kernel.org
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Diffstat (limited to 'drivers/video/fbdev/fsl-diu-fb.c')
| -rw-r--r-- | drivers/video/fbdev/fsl-diu-fb.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/video/fbdev/fsl-diu-fb.c b/drivers/video/fbdev/fsl-diu-fb.c index b335c1ae8625..fe00a07c122e 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; } /* @@ -1915,6 +1918,14 @@ 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 |