On Thu, 25 Jan 2001, Rasmus Andersen wrote:
> Hi.
>
> I apparently forgot to cc the lists on this one. Replies should be cc'ed
> to [EMAIL PROTECTED] also.
>
> Thanks.
The change should not harm, but request_region() is very unlikely to fail
here. Reason is that the drivers previously perform a check_region() in
order to synchronyze with any other driver that may have attached the same
device (candidates are : sym53c8xx, ncr53c8xx, 53c7,8xx)
By the way, as PCI only device drivers, the [sym|ncr]53c8xx drivers want
to use MMIO and not normal IO. The 'normal IO' path is here for archs that
donnot want to accept MMIO. Note that there are a couple of strangenesses
here:
1) The FreeBSD sym driver (derived from sym53c8xx) works with MMIO on
FreeBSD/Alpha, but the sym53c8xx fails MMIO under Linux/Alpha.
2) Power/PC port wants drivers to use normal IOs even on machines that
only have MMIO.
(2) looks rather a weirdness than a strangeness. :-)
Gérard.
> ----- Forwarded message from Rasmus Andersen <[EMAIL PROTECTED]> -----
>
> Date: Tue, 23 Jan 2001 23:37:14 +0100
> From: Rasmus Andersen <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED]
> Subject: [PATCH] make drivers/scsi/sym53c8xx.c check request_region's return code
>(241p9)
> User-Agent: Mutt/1.2.4i
>
> Hi.
>
> The following patch makes drivers/scsi/sym53c8xx.c check the return
> code of request_region. It applies cleanly against ac10 and 241p9.
>
> Please comment.
>
>
>
> --- linux-ac10-clean/drivers/scsi/sym53c8xx.c Mon Jan 1 19:23:21 2001
> +++ linux-ac10/drivers/scsi/sym53c8xx.c Sun Jan 21 21:40:54 2001
> @@ -5817,7 +5817,11 @@
> */
>
> if (device->slot.io_port) {
> - request_region(device->slot.io_port, np->base_ws, NAME53C8XX);
> + if (!request_region(device->slot.io_port, np->base_ws,
> + NAME53C8XX)) {
> + printk(KERN_ERR "Cannot mmap IO range.\n");
> + goto attach_error;
> + }
> np->base_io = device->slot.io_port;
> }
>
> --- linux-ac10-clean/drivers/scsi/sym53c8xx_comm.h Mon Oct 16 21:56:50 2000
> +++ linux-ac10/drivers/scsi/sym53c8xx_comm.h Mon Jan 22 21:56:46 2001
> @@ -1799,7 +1799,8 @@
> ** Get access to chip IO registers
> */
> #ifdef NCR_IOMAPPED
> - request_region(devp->slot.io_port, 128, NAME53C8XX);
> + if (!request_region(devp->slot.io_port, 128, NAME53C8XX))
> + return;
> devp->slot.base_io = devp->slot.io_port;
> #else
> devp->slot.reg = (struct ncr_reg *) remap_pci_mem(devp->slot.base, 128);
>
>
> --
> Regards,
> Rasmus([EMAIL PROTECTED])
>
> It isn't pollution that's harming the environment. It's the impurities in
> our air and water that are doing it. -Former U.S. Vice-President Dan
> Quayle
>
> ----- End forwarded message -----
>
> --
> Regards,
> Rasmus([EMAIL PROTECTED])
>
> Freedom of the press is limited to those who own one.
> - A.J. Liebling
> -
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