Re: [PATCH] gayle: reserve memory resources at once

From: Bartlomiej Zolnierkiewicz
Date: Mon Jul 21 2008 - 15:09:50 EST

On Saturday 19 July 2008, Geert Uytterhoeven wrote:
> On Sun, 22 Jun 2008, Bartlomiej Zolnierkiewicz wrote:
> > * Reserve memory resources for all IDE ports at once by moving
> > request_mem_region() out of 'for ()' loop and always defining
> > GAYLE_IDEREG_SIZE to 0x2000.
> >
> > * Keep memory resources even if no free IDE slots can be found
> > (this driver is unloadable currently).
> I don't like this part. You're changing the driver to no longer
> correctly handle initialization failures.

Yeah, I don't like it either. Unfortunately I don't have a better
idea of how to convert this driver to ide_host_add() without this step.

Anyway, this was meant to be temporary and I planned to fix it later
after ide_host_add() is in place but actually I forgot about it...

Fix below.

BTW core code was fixed to allow module removal so it would be great
if you (or somebody else fluent in zorro drivers) could take a look
into converting gayle.c and buddha.c to use new-style zorro probing
(struct zorro_driver & friends) so we can fix these drivers to use
->remove method + zorro_unregister_driver() for module_exit().

From: Bartlomiej Zolnierkiewicz <bzolnier@xxxxxxxxx>
Subject: [PATCH] gayle: release resources on ide_host_add() failure

"gayle: reserve memory resources at once" patch temporary removed
freeing of resources on failure (to ease convertion to ide_host_add()
interface). This patch fixes it.

Thanks to Geert for noticing the issue.

Noticed-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@xxxxxxxxx>
goes on top of pata tree

drivers/ide/legacy/gayle.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

Index: b/drivers/ide/legacy/gayle.c
--- a/drivers/ide/legacy/gayle.c
+++ b/drivers/ide/legacy/gayle.c
@@ -127,7 +127,7 @@ static int __init gayle_init(void)
unsigned long phys_base, res_start, res_n;
unsigned long base, ctrlport, irqport;
ide_ack_intr_t *ack_intr;
- int a4000, i;
+ int a4000, i, rc;
hw_regs_t hw[GAYLE_NUM_HWIFS], *hws[] = { NULL, NULL, NULL, NULL };

@@ -179,7 +179,11 @@ found:
hws[i] = &hw[i];

- return ide_host_add(NULL, hws, NULL);
+ rc = ide_host_add(NULL, hws, NULL);
+ if (rc)
+ release_mem_region(res_start, res_n);
+ return rc;

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