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Date: Mon, 18 Jan 2016 03:18:35 +0000 From: Ben Hutchings <ben@...adent.org.uk> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org CC: akpm@...ux-foundation.org, "Wang Dongsheng" <dongsheng.wang@...escale.com>, "Tomi Valkeinen" <tomi.valkeinen@...com>, "Timur Tabi" <timur@...i.org> Subject: [PATCH 3.2 03/70] video: fbdev: fsl: Fix kernel crash when diu_ops is not implemented 3.2.76-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Wang Dongsheng <dongsheng.wang@...escale.com> 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@...escale.com> Acked-by: Timur Tabi <timur@...i.org> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...com> [bwh: Backported to 3.2: adjust filename] Signed-off-by: Ben Hutchings <ben@...adent.org.uk> --- drivers/video/fbdev/fsl-diu-fb.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) --- a/drivers/video/fsl-diu-fb.c +++ b/drivers/video/fsl-diu-fb.c @@ -446,7 +446,10 @@ static enum fsl_diu_monitor_port fsl_diu 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; } /** @@ -1759,6 +1762,14 @@ 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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