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drivers/video/via/ioctl.c: prevent reading uninitialized stack memory
[~shefty/rdma-dev.git] / drivers / video / via / ioctl.c
1 /*
2  * Copyright 1998-2008 VIA Technologies, Inc. All Rights Reserved.
3  * Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved.
4
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU General Public
7  * License as published by the Free Software Foundation;
8  * either version 2, or (at your option) any later version.
9
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTIES OR REPRESENTATIONS; without even
12  * the implied warranty of MERCHANTABILITY or FITNESS FOR
13  * A PARTICULAR PURPOSE.See the GNU General Public License
14  * for more details.
15
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software
18  * Foundation, Inc.,
19  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20  */
21
22 #include "global.h"
23
24 int viafb_ioctl_get_viafb_info(u_long arg)
25 {
26         struct viafb_ioctl_info viainfo;
27
28         memset(&viainfo, 0, sizeof(struct viafb_ioctl_info));
29
30         viainfo.viafb_id = VIAID;
31         viainfo.vendor_id = PCI_VIA_VENDOR_ID;
32
33         switch (viaparinfo->chip_info->gfx_chip_name) {
34         case UNICHROME_CLE266:
35                 viainfo.device_id = UNICHROME_CLE266_DID;
36                 break;
37
38         case UNICHROME_K400:
39                 viainfo.device_id = UNICHROME_K400_DID;
40                 break;
41
42         case UNICHROME_K800:
43                 viainfo.device_id = UNICHROME_K800_DID;
44                 break;
45
46         case UNICHROME_PM800:
47                 viainfo.device_id = UNICHROME_PM800_DID;
48                 break;
49
50         case UNICHROME_CN700:
51                 viainfo.device_id = UNICHROME_CN700_DID;
52                 break;
53
54         case UNICHROME_CX700:
55                 viainfo.device_id = UNICHROME_CX700_DID;
56                 break;
57
58         case UNICHROME_K8M890:
59                 viainfo.device_id = UNICHROME_K8M890_DID;
60                 break;
61
62         case UNICHROME_P4M890:
63                 viainfo.device_id = UNICHROME_P4M890_DID;
64                 break;
65
66         case UNICHROME_P4M900:
67                 viainfo.device_id = UNICHROME_P4M900_DID;
68                 break;
69         }
70
71         viainfo.version = VERSION_MAJOR;
72         viainfo.revision = VERSION_MINOR;
73
74         if (copy_to_user((void __user *)arg, &viainfo, sizeof(viainfo)))
75                 return -EFAULT;
76
77         return 0;
78 }
79
80 /* Hot-Plug Priority: DVI > CRT*/
81 int viafb_ioctl_hotplug(int hres, int vres, int bpp)
82 {
83         int DVIsense, status = 0;
84         DEBUG_MSG(KERN_INFO "viafb_ioctl_hotplug!!\n");
85
86         if (viaparinfo->chip_info->tmds_chip_info.tmds_chip_name !=
87                 NON_TMDS_TRANSMITTER) {
88                 DVIsense = viafb_dvi_sense();
89
90                 if (DVIsense) {
91                         DEBUG_MSG(KERN_INFO "DVI Attached...\n");
92                         if (viafb_DeviceStatus != DVI_Device) {
93                                 viafb_DVI_ON = 1;
94                                 viafb_CRT_ON = 0;
95                                 viafb_LCD_ON = 0;
96                                 viafb_DeviceStatus = DVI_Device;
97                                 return viafb_DeviceStatus;
98                         }
99                         status = 1;
100                 } else
101                         DEBUG_MSG(KERN_INFO "DVI De-attached...\n");
102         }
103
104         if ((viafb_DeviceStatus != CRT_Device) && (status == 0)) {
105                 viafb_CRT_ON = 1;
106                 viafb_DVI_ON = 0;
107                 viafb_LCD_ON = 0;
108
109                 viafb_DeviceStatus = CRT_Device;
110                 return viafb_DeviceStatus;
111         }
112
113         return 0;
114 }