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From: Richard Weinberger on 11 Jun 2010 14:10
When I use OpenSUSE-11.2 on UML (> 2.6.25)
I get lots of such errors:

Registering fd 1 twice
Irqs : 3, 3
Ids : 0x09cb41a0, 0x09cb4120
------------[ cut here ]------------
WARNING: at kernel/irq/manage.c:896 __free_irq+0x79/0x11a()
Trying to free already-free IRQ 3
Modules linked in:
09dadc6c: [<081b2edb>] dump_stack+0x1c/0x20
09dadc84: [<080716da>] warn_slowpath_common+0x49/0x77
09dadc9c: [<08071772>] warn_slowpath_fmt+0x26/0x2a
09dadcb4: [<08094e08>] __free_irq+0x79/0x11a
09dadce4: [<08094ed6>] free_irq+0x2d/0x49
09dadcf4: [<0805b4bc>] close_one_chan+0x70/0x9c
09dadd0c: [<0805b833>] close_chan+0x17/0x22
09dadd1c: [<0805bdda>] enable_chan+0x70/0x7c
09dadd3c: [<0805cbb7>] line_open+0x34/0x9f
09dadd54: [<0805b21e>] con_open+0x13/0x35
09dadd6c: [<0814dc89>] tty_open+0x285/0x384
09dadda0: [<080b754e>] chrdev_open+0xe0/0xf9
09daddc0: [<080b3fb2>] __dentry_open+0xf3/0x1e2
09dadde4: [<080b4142>] nameidata_to_filp+0x35/0x49
09daddfc: [<080bd270>] do_last+0x409/0x50e
09dade28: [<080bea04>] do_filp_open+0x175/0x446
09dadecc: [<080b3d89>] do_sys_open+0x4a/0x128
09dadf04: [<080b3ea2>] sys_open+0x19/0x21
09dadf28: [<0805ab5a>] handle_syscall+0x7a/0x98
09dadf78: [<08068441>] userspace+0x2c9/0x370
09dadfe0: [<08058bb3>] fork_handler+0x53/0x5b
09dadffc: [<00766564>] 0x766564

---[ end trace 9ebc1094aaf4bded ]---

This patch fixes the issue.

Signed-off-by: Richard Weinberger <richard(a)nod.at>
---
arch/um/drivers/chan_kern.c | 8 ++++----
1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/um/drivers/chan_kern.c b/arch/um/drivers/chan_kern.c
index 6e51424..25e1965 100644
--- a/arch/um/drivers/chan_kern.c
+++ b/arch/um/drivers/chan_kern.c
@@ -210,9 +210,9 @@ void free_irqs(void)
list_for_each(ele, &list) {
chan = list_entry(ele, struct chan, free_list);

- if (chan->input)
+ if (chan->input && chan->enabled)
free_irq(chan->line->driver->read_irq, chan);
- if (chan->output)
+ if (chan->output && chan->enabled)
free_irq(chan->line->driver->write_irq, chan);
chan->enabled = 0;
}
@@ -231,9 +231,9 @@ static void close_one_chan(struct chan *chan, int delay_free_irq)
spin_unlock_irqrestore(&irqs_to_free_lock, flags);
}
else {
- if (chan->input)
+ if (chan->input && chan->enabled)
free_irq(chan->line->driver->read_irq, chan);
- if (chan->output)
+ if (chan->output && chan->enabled)
free_irq(chan->line->driver->write_irq, chan);
chan->enabled = 0;
}
--
1.6.6.1

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Prev: x86: ioremap: fix physical address check
Next: fix the racy usage of thread_group_cputimer() in fastpath_timer_check()