Messages in this thread Patch in this message | | | Date | Sun, 29 Jul 2012 20:48:23 +0200 | From | Witold Szczeponik <> | Subject | [PATCH V3 2/3] PNP: Allow resources to be set as disabled |
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This patch allows to set PNP resources as "disabled". As such, the patch is a follow-up to commit 18fd470a48396c8795ba7256c5973e92ffa25cb3 where parsing of ACPI PNP resources that can be disabled was made possible.
The patch achieves this by allowing the strings "disabled" and "<none>" to be used as a valid PNP resource value. The value "disabled" is used because it also appears when reporting PNP resources, whereas the string "<none>" is used when reporting PNP options.
The patch is required in order to support the setting of "disabled" IRQs like described in the commit 29df8d8f8702f0f53c1375015f09f04bc8d023c1, i.e., with this patch applied, some vintage IBM ThinkPads like the 600E can allocate the resources such that all devices can be used simultaneously.
The patch is applied against Linux 3.5.x.
Signed-off-by: Witold Szczeponik <Witold.Szczeponik@gmx.net> Reviewed-by: Bjorn Helgaas <bhelgaas@google.com>
Index: linux/drivers/pnp/interface.c =================================================================== --- linux.orig/drivers/pnp/interface.c +++ linux/drivers/pnp/interface.c @@ -311,10 +311,14 @@ static char *pnp_get_resource_value(char if (flags) *flags = 0; - /* TBD: allow for disabled resources */ - buf = skip_spaces(buf); - if (start) { + if (flags && !strnicmp(buf, "disabled", 8)) { + buf += 8; + *flags |= IORESOURCE_DISABLED; + } else if (flags && !strnicmp(buf, "<none>", 6)) { + buf += 6; + *flags |= IORESOURCE_DISABLED; + } else if (start) { *start = simple_strtoull(buf, &buf, 0); if (end) { buf = skip_spaces(buf);
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