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HID: picoLCD: Improve unplug handling 

Stop earlier attempting to submit new reports/URBs (though locking and
usbhid still prevents to bail out early enough to not produce multiple
  hid-picolcd 0003:04D8:C002.0003: usb_submit_urb(out) failed: -19
messages in kernel log.

Strengthen framebuffer removal to be less racy.

Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Bruno Prémont 2012-07-30 21:38:57 +02:00 committed by Jiri Kosina
parent baacf9c5d2
commit a93ab84948
5 changed files with 46 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/hid/hid-picolcd_backlight.c
View File

@ -45,7 +45,8 @@ static int picolcd_set_brightness(struct backlight_device *bdev)
data->lcd_power = bdev->props.power;
spin_lock_irqsave(&data->lock, flags);
hid_set_field(report->field[0], 0, data->lcd_power == FB_BLANK_UNBLANK ? data->lcd_brightness : 0);
usbhid_submit_report(data->hdev, report, USB_DIR_OUT);
if (!(data->status & PICOLCD_FAILED))
usbhid_submit_report(data->hdev, report, USB_DIR_OUT);
spin_unlock_irqrestore(&data->lock, flags);
return 0;
}

21
drivers/hid/hid-picolcd_core.c
View File

@ -105,12 +105,17 @@ struct picolcd_pending *picolcd_send_and_wait(struct hid_device *hdev,
hid_set_field(report->field[i], j, k < size ? raw_data[k] : 0);
k++;
}
data->pending = work;
usbhid_submit_report(data->hdev, report, USB_DIR_OUT);
spin_unlock_irqrestore(&data->lock, flags);
wait_for_completion_interruptible_timeout(&work->ready, HZ*2);
spin_lock_irqsave(&data->lock, flags);
data->pending = NULL;
if (data->status & PICOLCD_FAILED) {
kfree(work);
work = NULL;
} else {
data->pending = work;
usbhid_submit_report(data->hdev, report, USB_DIR_OUT);
spin_unlock_irqrestore(&data->lock, flags);
wait_for_completion_interruptible_timeout(&work->ready, HZ*2);
spin_lock_irqsave(&data->lock, flags);
data->pending = NULL;
}
spin_unlock_irqrestore(&data->lock, flags);
mutex_unlock(&data->mutex);
return work;
@ -235,6 +240,10 @@ int picolcd_reset(struct hid_device *hdev)
/* perform the reset */
hid_set_field(report->field[0], 0, 1);
if (data->status & PICOLCD_FAILED) {
spin_unlock_irqrestore(&data->lock, flags);
return -ENODEV;
}
usbhid_submit_report(hdev, report, USB_DIR_OUT);
spin_unlock_irqrestore(&data->lock, flags);

41
drivers/hid/hid-picolcd_fb.c
View File

@ -226,13 +226,16 @@ int picolcd_fb_reset(struct picolcd_data *data, int clear)
}
/* Update fb_vbitmap from the screen_base and send changed tiles to device */
static void picolcd_fb_update(struct picolcd_data *data)
static void picolcd_fb_update(struct fb_info *info)
{
int chip, tile, n;
unsigned long flags;
struct picolcd_data *data;
mutex_lock(&info->lock);
data = info->par;
if (!data)
return;
goto out;
spin_lock_irqsave(&data->lock, flags);
if (!(data->status & PICOLCD_READY_FB)) {
@ -256,17 +259,31 @@ static void picolcd_fb_update(struct picolcd_data *data)
data->fb_bitmap, data->fb_bpp, chip, tile) ||
data->fb_force) {
n += 2;
if (data->status & PICOLCD_FAILED)
return; /* device lost! */
if (n >= HID_OUTPUT_FIFO_SIZE / 2) {
mutex_unlock(&info->lock);
usbhid_wait_io(data->hdev);
mutex_lock(&info->lock);
data = info->par;
if (!data)
goto out;
spin_lock_irqsave(&data->lock, flags);
if (data->status & PICOLCD_FAILED) {
spin_unlock_irqrestore(&data->lock, flags);
goto out;
}
spin_unlock_irqrestore(&data->lock, flags);
n = 0;
}
picolcd_fb_send_tile(data->hdev, chip, tile);
}
data->fb_force = false;
if (n)
if (n) {
mutex_unlock(&info->lock);
usbhid_wait_io(data->hdev);
return;
}
out:
mutex_unlock(&info->lock);
}
/* Stub to call the system default and update the image on the picoLCD */
@ -327,17 +344,12 @@ static int picolcd_fb_blank(int blank, struct fb_info *info)
static void picolcd_fb_destroy(struct fb_info *info)
{
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);
vfree((u8 *)info->fix.smem_start);
framebuffer_release(info);
printk(KERN_DEBUG "picolcd_fb_destroy(%p)\n", info);
}
static int picolcd_fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
@ -425,7 +437,7 @@ static struct fb_ops picolcdfb_ops = {
/* Callback from deferred IO workqueue */
static void picolcd_fb_deferred_io(struct fb_info *info, struct list_head *pagelist)
{
picolcd_fb_update(info->par);
picolcd_fb_update(info);
}
static const struct fb_deferred_io picolcd_fb_defio = {
@ -582,10 +594,7 @@ 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;

3
drivers/hid/hid-picolcd_lcd.c
View File

@ -47,7 +47,8 @@ static int picolcd_set_contrast(struct lcd_device *ldev, int contrast)
data->lcd_contrast = contrast & 0x0ff;
spin_lock_irqsave(&data->lock, flags);
hid_set_field(report->field[0], 0, data->lcd_contrast);
usbhid_submit_report(data->hdev, report, USB_DIR_OUT);
if (!(data->status & PICOLCD_FAILED))
usbhid_submit_report(data->hdev, report, USB_DIR_OUT);
spin_unlock_irqrestore(&data->lock, flags);
return 0;
}

3
drivers/hid/hid-picolcd_leds.c
View File

@ -54,7 +54,8 @@ void picolcd_leds_set(struct picolcd_data *data)
spin_lock_irqsave(&data->lock, flags);
hid_set_field(report->field[0], 0, data->led_state);
usbhid_submit_report(data->hdev, report, USB_DIR_OUT);
if (!(data->status & PICOLCD_FAILED))
usbhid_submit_report(data->hdev, report, USB_DIR_OUT);
spin_unlock_irqrestore(&data->lock, flags);
}