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fbcon: fix locking harder

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Okay so Alan's patch handled the case where there was no registered fbcon,
however the other path entered in set_con2fb_map pit.

In there we called fbcon_takeover, but we also took the console lock in a couple
of places. So push the console lock out to the callers of set_con2fb_map,

this means fbmem and switcheroo needed to take the lock around the fb notifier
entry points that lead to this.

This should fix the efifb regression seen by Maarten.

Tested-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Tested-by: Lu Hua <huax.lu@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2013-01-25 11:38:56 +10:00 committed by Dave Airlie
parent e93a9a8687
commit 054430e773
3 changed files with 13 additions and 3 deletions
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3
drivers/gpu/vga/vga_switcheroo.c
View file

@ -25,6 +25,7 @@
#include <linux/fb.h>
#include <linux/pci.h>
#include <linux/console.h>
#include <linux/vga_switcheroo.h>
#include <linux/vgaarb.h>
@ -337,8 +338,10 @@ static int vga_switchto_stage2(struct vga_switcheroo_client *new_client)
if (new_client->fb_info) {
struct fb_event event;
console_lock();
event.info = new_client->fb_info;
fb_notifier_call_chain(FB_EVENT_REMAP_ALL_CONSOLE, &event);
console_unlock();
}
ret = vgasr_priv.handler->switchto(new_client->id);

11
drivers/video/console/fbcon.c
View file

@ -842,6 +842,8 @@ static void con2fb_init_display(struct vc_data *vc, struct fb_info *info,
*
* Maps a virtual console @unit to a frame buffer device
* @newidx.
*
* This should be called with the console lock held.
*/
static int set_con2fb_map(int unit, int newidx, int user)
{
@ -859,7 +861,7 @@ static int set_con2fb_map(int unit, int newidx, int user)
if (!search_for_mapped_con() || !con_is_bound(&fb_con)) {
info_idx = newidx;
return fbcon_takeover(0);
return do_fbcon_takeover(0);
}
if (oldidx != -1)
@ -867,7 +869,6 @@ static int set_con2fb_map(int unit, int newidx, int user)
found = search_fb_in_map(newidx);
console_lock();
con2fb_map[unit] = newidx;
if (!err && !found)
err = con2fb_acquire_newinfo(vc, info, unit, oldidx);
@ -894,7 +895,6 @@ static int set_con2fb_map(int unit, int newidx, int user)
if (!search_fb_in_map(info_idx))
info_idx = newidx;
console_unlock();
return err;
}
@ -3019,6 +3019,7 @@ static inline int fbcon_unbind(void)
}
#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
/* called with console_lock held */
static int fbcon_fb_unbind(int idx)
{
int i, new_idx = -1, ret = 0;
@ -3045,6 +3046,7 @@ static int fbcon_fb_unbind(int idx)
return ret;
}
/* called with console_lock held */
static int fbcon_fb_unregistered(struct fb_info *info)
{
int i, idx;
@ -3082,6 +3084,7 @@ static int fbcon_fb_unregistered(struct fb_info *info)
return 0;
}
/* called with console_lock held */
static void fbcon_remap_all(int idx)
{
int i;
@ -3126,6 +3129,7 @@ static inline void fbcon_select_primary(struct fb_info *info)
}
#endif /* CONFIG_FRAMEBUFFER_DETECT_PRIMARY */
/* called with console_lock held */
static int fbcon_fb_registered(struct fb_info *info)
{
int ret = 0, i, idx;
@ -3278,6 +3282,7 @@ static int fbcon_event_notify(struct notifier_block *self,
ret = fbcon_fb_unregistered(info);
break;
case FB_EVENT_SET_CONSOLE_MAP:
/* called with console lock held */
con2fb = event->data;
ret = set_con2fb_map(con2fb->console - 1,
con2fb->framebuffer, 1);

2
drivers/video/fbmem.c
View file

@ -1177,8 +1177,10 @@ static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
event.data = &con2fb;
if (!lock_fb_info(info))
return -ENODEV;
console_lock();
event.info = info;
ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
console_unlock();
unlock_fb_info(info);
break;
case FBIOBLANK: