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Subjectfixing dual head issue with DRI
Hi, i've made this little patch against drivers/char/drm/proc.c to
enable dual head in /proc/dri. I'm quite sure
that it's not SMP safe, so if anybody could give a look. Anyway it
worked for me.

*** proc.c.orig Mon Oct 16 00:45:53 2000
--- proc.c Mon Oct 16 03:42:30 2000
***************
*** 73,83 ****
--- 73,120 ----
};
#define DRM_PROC_ENTRIES
(sizeof(drm_proc_list)/sizeof(drm_proc_list[0]))

+ int proc_match2(int len, const char *name,struct proc_dir_entry * de)
+ {
+ if (!de || !de->low_ino)
+ return 0;
+ if (de->namelen != len)
+ return 0;
+ return !memcmp(name, de->name, len);
+ }
+ static struct proc_dir_entry *exists_proc_dir( char *name )
+ {
+ const char *cp = name, *next;
+ struct proc_dir_entry *de;
+ int len;
+
+ de = &proc_root;
+ while (1) {
+ next = strchr(cp, '/');
+ if (!next)
+ break;
+
+ len = next - cp;
+ for (de = de->subdir; de ; de = de->next) {
+ if (proc_match2(len, cp, de)) break;
+ }
+ if (!de)
+ return NULL;
+ cp += len + 1;
+ }
+ len = strlen(cp);
+ for (de = de->subdir; de ; de = de->next) {
+ if (proc_match2(len, cp, de)) return de;
+ }
+ return NULL;
+ }
+
int drm_proc_init(drm_device_t *dev)
{
struct proc_dir_entry *ent;
int i, j;

+ drm_root = exists_proc_dir("dri");
+ if( !drm_root )
drm_root = create_proc_entry("dri", S_IFDIR, NULL);
if (!drm_root) {
DRM_ERROR("Cannot create /proc/dri\n");
***************
*** 88,94 ****
--- 125,134 ----
add some global support for
/proc/dri. */
for (i = 0; i < 8; i++) {
sprintf(drm_slot_name, "dri/%d", i);
+ drm_dev_root = exists_proc_dir(drm_slot_name);
+ if(drm_dev_root) continue;
drm_dev_root = create_proc_entry(drm_slot_name, S_IFDIR,
NULL);
+
if (!drm_dev_root) {
DRM_ERROR("Cannot create /proc/%s\n",
drm_slot_name);
remove_proc_entry("dri", NULL);


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