/* Called under the mutex to grab exclusive access to a drive */
static int grab_drive(struct floppy_state *fs, enum swim_state state,
int interruptible)
{
unsigned long flags;
swim3_dbg("%s", "-> grab drive\n");
spin_lock_irqsave(&swim3_lock, flags);
if (fs->state != idle && fs->state != available) {
++fs->wanted;
/* this will enable irqs in order to sleep */
if (!interruptible)
wait_event_lock_irq(fs->wait,
fs->state == available,
swim3_lock);
else if (wait_event_interruptible_lock_irq(fs->wait,
fs->state == available,
swim3_lock)) {
--fs->wanted;
spin_unlock_irqrestore(&swim3_lock, flags);
return -EINTR;
}
--fs->wanted;
}
fs->state = state;
spin_unlock_irqrestore(&swim3_lock, flags);
return 0;
}
/* this gets called when the md device is ready to unplug its underlying
* (slave) device queues -- before we let any writes go down, we need to
* sync the dirty pages of the bitmap file to disk */
int bitmap_unplug(struct bitmap *bitmap)
{
unsigned long i, attr, flags;
struct page *page;
int wait = 0;
int err;
if (!bitmap)
return 0;
/* look at each page to see if there are any set bits that need to be
* flushed out to disk */
for (i = 0; i < bitmap->file_pages; i++) {
spin_lock_irqsave(&bitmap->lock, flags);
if (!bitmap->filemap) {
spin_unlock_irqrestore(&bitmap->lock, flags);
return 0;
}
page = bitmap->filemap[i];
attr = get_page_attr(bitmap, page);
clear_page_attr(bitmap, page, BITMAP_PAGE_DIRTY);
clear_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE);
if ((attr & BITMAP_PAGE_DIRTY))
wait = 1;
spin_unlock_irqrestore(&bitmap->lock, flags);
if (attr & (BITMAP_PAGE_DIRTY | BITMAP_PAGE_NEEDWRITE)) {
err = write_page(bitmap, page, 0);
if (err == -EAGAIN) {
if (attr & BITMAP_PAGE_DIRTY)
err = write_page(bitmap, page, 1);
else
err = 0;
}
if (err)
return 1;
}
}
if (wait) { /* if any writes were performed, we need to wait on them */
if (bitmap->file) {
spin_lock_irq(&bitmap->write_lock);
wait_event_lock_irq(bitmap->write_wait,
list_empty(&bitmap->complete_pages), bitmap->write_lock,
wake_up_process(bitmap->writeback_daemon->tsk));
spin_unlock_irq(&bitmap->write_lock);
} else
md_super_wait(bitmap->mddev);
}
return 0;
}
static void histo_stop_streaming(struct vb2_queue *vq)
{
struct vsp1_histogram *histo = vb2_get_drv_priv(vq);
struct vsp1_histogram_buffer *buffer;
unsigned long flags;
spin_lock_irqsave(&histo->irqlock, flags);
/* Remove all buffers from the IRQ queue. */
list_for_each_entry(buffer, &histo->irqqueue, queue)
vb2_buffer_done(&buffer->buf.vb2_buf, VB2_BUF_STATE_ERROR);
INIT_LIST_HEAD(&histo->irqqueue);
/* Wait for the buffer being read out (if any) to complete. */
wait_event_lock_irq(histo->wait_queue, !histo->readout, histo->irqlock);
spin_unlock_irqrestore(&histo->irqlock, flags);
}
