Re: pcmcia oops on 2.6.17-rc[12]

[Russell King <rmk+lkml@arm.linux.org.uk>]

On Mon, May 15, 2006 at 11:00:44PM +0100, Russell King wrote:
> On Mon, May 15, 2006 at 11:07:08PM +0100, Alan Cox wrote:
> > On Llu, 2006-05-08 at 17:34 +0100, Russell King wrote:
> > > > So 8250 is requesting an IRQ for non-sharing mode and it's actually
> > > > failing, because something else is already using that IRQ.  The difference
> > > > is that the kernel now generates a warning when this happens.
> > > 
> > > Maybe someone is clearing the UPF_SHARE_IRQ flag?  Which port is this?
> > 
> > Its a bug in the PCMCIA code. Its the one I hit with the IDE code.
> > Asking for a private IRQ is not always honoured.
> 
> Not in this case - the call trace is definitely a result of setserial
> being used.  serial_cs _always_ registers ports with 8250 with the
> share IRQ flag set.

Given that no one has responded to my comments on this, I take it that
this is a case of user error or distro scripting error.

setserial should never be used to clear the shared IRQ flag bit unless
there's a very good reason (eg, the admin knows that the IRQ should not
be shared.)

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 Serial core