From 7d4f9f094b0a01ba199f97cd4a5f5609391a04f9 Mon Sep 17 00:00:00 2001 From: Jiri Slaby Date: Tue, 29 Apr 2008 00:59:14 -0700 Subject: [PATCH] Misc, phantom, fix poll Return ERR even if there are pending data, but hw is not running. Do not decrement count in poll, do it in ioctl, where data are actually read. Signed-off-by: Jiri Slaby Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/misc/phantom.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/misc/phantom.c b/drivers/misc/phantom.c index 5447a603686..71d1c84e2fa 100644 --- a/drivers/misc/phantom.c +++ b/drivers/misc/phantom.c @@ -169,6 +169,7 @@ static long phantom_ioctl(struct file *file, unsigned int cmd, for (i = 0; i < m; i++) if (rs.mask & BIT(i)) rs.values[i] = ioread32(dev->iaddr + i); + atomic_set(&dev->counter, 0); spin_unlock_irqrestore(&dev->regs_lock, flags); if (copy_to_user(argp, &rs, sizeof(rs))) @@ -254,11 +255,12 @@ static unsigned int phantom_poll(struct file *file, poll_table *wait) pr_debug("phantom_poll: %d\n", atomic_read(&dev->counter)); poll_wait(file, &dev->wait, wait); - if (atomic_read(&dev->counter)) { + + if (!(dev->status & PHB_RUNNING)) + mask = POLLERR; + else if (atomic_read(&dev->counter)) mask = POLLIN | POLLRDNORM; - atomic_dec(&dev->counter); - } else if ((dev->status & PHB_RUNNING) == 0) - mask = POLLIN | POLLRDNORM | POLLERR; + pr_debug("phantom_poll end: %x/%d\n", mask, atomic_read(&dev->counter)); return mask; -- 2.20.1