Whoops! Sent it without proof-reading. I AM SORRY! Please ignore the
previous patch, here is the correct patch ...

Thanks
- Bhavesh

--
Bhavesh P. Davda     E-mail    : bhavesh@avaya.com
Avaya Inc.           Phone/Fax : (303) 538-4438
Room B3-B03, 1300 West 120th Avenue
Westminster, CO 80234

> -----Original Message-----
> From: Bhavesh P. Davda
> Sent: Tuesday, July 15, 2003 3:57 PM
> To: linux-kernel@vger.kernel.org
> Cc: fischer@norbit.de; dahinds@users.sourceforge.net; Marcelo Tosatti
> Subject: [PATCH] AHA152x driver hangs on PCMCIA card eject, kernel
> 2.4.22-pre6
>
>
> Juergen, David; please review this patch, and recommend that
> Marcelo apply this patch if you think it is okay... Thanks!
>
> Attached is a patch against linux-2.4.22-pre6, to fix a hang
> problem when an Adaptec SlimSCSI (PCMCIA) adapter is ejected from
> a PCMCIA card reader (e.g. yenta/TI1225 based).
>
> The fix involves:
>
> 1. A change to the common aha152x driver to ignore an interrupt
> in the top-half handler if it cannot read valid data from the I/O
> ports (possibly due to a bad host-adapter chip or an ejected
> PCMCIA card). This way, a shared interrupt handler (e.g. yenta)
> can pick up the interrupt if the IRQ is really meant for it. This
> is where the original hang was taking place; the aha152x bottom
> half was getting into an infinite loop, though the SlimSCSI card
> had been ejected, and the actual IRQ was meant for yenta.
>
> 2. A change to the aha152x_cs stub driver to not use the SCSI
> error-handling thread code. The aha152x_cs driver calls
> scsi_unregister_module() as a queued timer task when it gets a
> CS_EVENT_CARD_REMOVAL event, which causes scsi_unregister_host()
> to do a down() on a semaphore, calling schedule(), when executing
> the timer_bh for the timer.
>
> Thanks!
>
> - Bhavesh
> --
> Bhavesh P. Davda     E-mail    : bhavesh@avaya.com
> Avaya Inc.           Phone/Fax : (303) 538-4438
> Room B3-B03, 1300 West 120th Avenue
> Westminster, CO 80234