From 9966c37c467167f29850fd0a856fce7031353bf3 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Bruno=20Pr=C3=A9mont?= Date: Mon, 30 Jul 2012 21:38:46 +0200 Subject: [PATCH] HID: picoLCD: Replace own refcounting with fbdev's MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Signed-off-by: Bruno Prémont Signed-off-by: Jiri Kosina --- drivers/hid/hid-picolcd.h | 6 -- drivers/hid/hid-picolcd_core.c | 1 - drivers/hid/hid-picolcd_fb.c | 114 ++++++--------------------------- 3 files changed, 18 insertions(+), 103 deletions(-) diff --git a/drivers/hid/hid-picolcd.h b/drivers/hid/hid-picolcd.h index 4ddb3188d5c8..9200be165526 100644 --- a/drivers/hid/hid-picolcd.h +++ b/drivers/hid/hid-picolcd.h @@ -96,7 +96,6 @@ struct picolcd_data { u8 *fb_vbitmap; /* local copy of what was sent to PicoLCD */ u8 *fb_bitmap; /* framebuffer */ struct fb_info *fb_info; - struct fb_deferred_io fb_defio; #endif /* CONFIG_HID_PICOLCD_FB */ #ifdef CONFIG_HID_PICOLCD_LCD struct lcd_device *lcd; @@ -179,8 +178,6 @@ int picolcd_init_framebuffer(struct picolcd_data *data); void picolcd_exit_framebuffer(struct picolcd_data *data); -void picolcd_fb_unload(void); - void picolcd_fb_refresh(struct picolcd_data *data); #define picolcd_fbinfo(d) ((d)->fb_info) #else @@ -195,9 +192,6 @@ static inline int picolcd_init_framebuffer(struct picolcd_data *data) static inline void picolcd_exit_framebuffer(struct picolcd_data *data) { } -static inline void picolcd_fb_unload(void) -{ -} static inline void picolcd_fb_refresh(struct picolcd_data *data) { } diff --git a/drivers/hid/hid-picolcd_core.c b/drivers/hid/hid-picolcd_core.c index 36e7548a6e19..8d5d341adeab 100644 --- a/drivers/hid/hid-picolcd_core.c +++ b/drivers/hid/hid-picolcd_core.c @@ -695,7 +695,6 @@ static int __init picolcd_init(void) static void __exit picolcd_exit(void) { hid_unregister_driver(&picolcd_driver); - picolcd_fb_unload(); } module_init(picolcd_init); diff --git a/drivers/hid/hid-picolcd_fb.c b/drivers/hid/hid-picolcd_fb.c index b2124f566c61..602786c18b72 100644 --- a/drivers/hid/hid-picolcd_fb.c +++ b/drivers/hid/hid-picolcd_fb.c @@ -256,7 +256,7 @@ static void picolcd_fb_update(struct picolcd_data *data) 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 int picolcd_fb_blank(int blank, struct fb_info *info) 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 @@ static int picolcd_set_par(struct fb_info *info) 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 @@ static ssize_t picolcd_fb_update_rate_store(struct device *dev, 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 @@ int picolcd_init_framebuffer(struct picolcd_data *data) } 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 @@ void picolcd_exit_framebuffer(struct picolcd_data *data) 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 @@ void picolcd_exit_framebuffer(struct picolcd_data *data) data->fb_info = NULL; kfree(fb_vbitmap); } - -void picolcd_fb_unload() -{ - flush_work_sync(&picolcd_fb_cleanup); - WARN_ON(fb_pending); -} -- 2.20.1