HID: picoLCD: Replace own refcounting with fbdev's
Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/hid/hid-picolcd_fb.c b/drivers/hid/hid-picolcd_fb.c
index b2124f5..602786c 100644
--- a/drivers/hid/hid-picolcd_fb.c
+++ b/drivers/hid/hid-picolcd_fb.c
@@ -256,7 +256,7 @@
data->fb_bitmap, data->fb_bpp, chip, tile) ||
data->fb_force) {
n += 2;
- if (!data->fb_info->par)
+ if (data->status & PICOLCD_FAILED)
return; /* device lost! */
if (n >= HID_OUTPUT_FIFO_SIZE / 2) {
usbhid_wait_io(data->hdev);
@@ -327,24 +327,17 @@
static void picolcd_fb_destroy(struct fb_info *info)
{
- struct picolcd_data *data = info->par;
- u32 *ref_cnt = info->pseudo_palette;
- int may_release;
+ struct picolcd_data *data;
+ /* make sure no work is deferred */
+ cancel_delayed_work_sync(&info->deferred_work);
+ data = info->par;
info->par = NULL;
if (data)
data->fb_info = NULL;
- fb_deferred_io_cleanup(info);
- ref_cnt--;
- mutex_lock(&info->lock);
- (*ref_cnt)--;
- may_release = !*ref_cnt;
- mutex_unlock(&info->lock);
- if (may_release) {
- vfree((u8 *)info->fix.smem_start);
- framebuffer_release(info);
- }
+ vfree((u8 *)info->fix.smem_start);
+ framebuffer_release(info);
}
static int picolcd_fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
@@ -414,77 +407,10 @@
return 0;
}
-/* Do refcounting on our FB and cleanup per worker if FB is
- * closed after unplug of our device
- * (fb_release holds info->lock and still touches info after
- * we return so we can't release it immediately.
- */
-struct picolcd_fb_cleanup_item {
- struct fb_info *info;
- struct picolcd_fb_cleanup_item *next;
-};
-static struct picolcd_fb_cleanup_item *fb_pending;
-static DEFINE_SPINLOCK(fb_pending_lock);
-
-static void picolcd_fb_do_cleanup(struct work_struct *data)
-{
- struct picolcd_fb_cleanup_item *item;
- unsigned long flags;
-
- do {
- spin_lock_irqsave(&fb_pending_lock, flags);
- item = fb_pending;
- fb_pending = item ? item->next : NULL;
- spin_unlock_irqrestore(&fb_pending_lock, flags);
-
- if (item) {
- u8 *fb = (u8 *)item->info->fix.smem_start;
- /* make sure we do not race against fb core when
- * releasing */
- mutex_lock(&item->info->lock);
- mutex_unlock(&item->info->lock);
- framebuffer_release(item->info);
- vfree(fb);
- }
- } while (item);
-}
-
-static DECLARE_WORK(picolcd_fb_cleanup, picolcd_fb_do_cleanup);
-
-static int picolcd_fb_open(struct fb_info *info, int u)
-{
- u32 *ref_cnt = info->pseudo_palette;
- ref_cnt--;
-
- (*ref_cnt)++;
- return 0;
-}
-
-static int picolcd_fb_release(struct fb_info *info, int u)
-{
- u32 *ref_cnt = info->pseudo_palette;
- ref_cnt--;
-
- (*ref_cnt)++;
- if (!*ref_cnt) {
- unsigned long flags;
- struct picolcd_fb_cleanup_item *item = (struct picolcd_fb_cleanup_item *)ref_cnt;
- item--;
- spin_lock_irqsave(&fb_pending_lock, flags);
- item->next = fb_pending;
- fb_pending = item;
- spin_unlock_irqrestore(&fb_pending_lock, flags);
- schedule_work(&picolcd_fb_cleanup);
- }
- return 0;
-}
-
/* Note this can't be const because of struct fb_info definition */
static struct fb_ops picolcdfb_ops = {
.owner = THIS_MODULE,
.fb_destroy = picolcd_fb_destroy,
- .fb_open = picolcd_fb_open,
- .fb_release = picolcd_fb_release,
.fb_read = fb_sys_read,
.fb_write = picolcd_fb_write,
.fb_blank = picolcd_fb_blank,
@@ -550,7 +476,7 @@
u = PICOLCDFB_UPDATE_RATE_DEFAULT;
data->fb_update_rate = u;
- data->fb_defio.delay = HZ / data->fb_update_rate;
+ data->fb_info->fbdefio->delay = HZ / data->fb_update_rate;
return count;
}
@@ -580,25 +506,23 @@
}
data->fb_update_rate = PICOLCDFB_UPDATE_RATE_DEFAULT;
- data->fb_defio = picolcd_fb_defio;
/* The extra memory is:
- * - struct picolcd_fb_cleanup_item
- * - u32 for ref_count
* - 256*u32 for pseudo_palette
+ * - struct fb_deferred_io
*/
- info = framebuffer_alloc(257 * sizeof(u32) + sizeof(struct picolcd_fb_cleanup_item), dev);
+ info = framebuffer_alloc(256 * sizeof(u32) +
+ sizeof(struct fb_deferred_io), dev);
if (info == NULL) {
dev_err(dev, "failed to allocate a framebuffer\n");
goto err_nomem;
}
- palette = info->par + sizeof(struct picolcd_fb_cleanup_item);
- *palette = 1;
- palette++;
+ info->fbdefio = info->par;
+ *info->fbdefio = picolcd_fb_defio;
+ palette = info->par + sizeof(struct fb_deferred_io);
for (i = 0; i < 256; i++)
palette[i] = i > 0 && i < 16 ? 0xff : 0;
info->pseudo_palette = palette;
- info->fbdefio = &data->fb_defio;
info->screen_base = (char __force __iomem *)fb_bitmap;
info->fbops = &picolcdfb_ops;
info->var = picolcdfb_var;
@@ -658,6 +582,10 @@
return;
device_remove_file(&data->hdev->dev, &dev_attr_fb_update_rate);
+ mutex_lock(&info->lock);
+ fb_deferred_io_cleanup(info);
+ info->par = NULL;
+ mutex_unlock(&info->lock);
unregister_framebuffer(info);
data->fb_vbitmap = NULL;
data->fb_bitmap = NULL;
@@ -665,9 +593,3 @@
data->fb_info = NULL;
kfree(fb_vbitmap);
}
-
-void picolcd_fb_unload()
-{
- flush_work_sync(&picolcd_fb_cleanup);
- WARN_ON(fb_pending);
-}