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PNP: Allow console to override ACPI device sleep

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If the serial console is an ACPI PNP device, the PNP bus always powers
down the device at system suspend, even though the no_console_suspend
command line parameter is specified (eg., when debugging suspend/resume).

Add PNP_CONSOLE capability, which when set, prevents calling both the
->disable() and ->suspend() PNP protocol methods if console suspend
is disabled.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2015-01-22 11:50:24 -05:00 committed by Greg Kroah-Hartman
parent 2f7f558c22
commit 01395d7984
2 changed files with 11 additions and 3 deletions
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2
drivers/pnp/driver.c
View file

@ -182,7 +182,7 @@ static int __pnp_bus_suspend(struct device *dev, pm_message_t state)
return error;
}
if (pnp_dev->protocol->suspend)
if (pnp_can_suspend(pnp_dev))
pnp_dev->protocol->suspend(pnp_dev, state);
return 0;
}

12
include/linux/pnp.h
View file

@ -12,6 +12,7 @@
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/mod_devicetable.h>
#include <linux/console.h>
#define PNP_NAME_LEN 50
@ -309,15 +310,22 @@ struct pnp_fixup {
#define PNP_DISABLE 0x0004
#define PNP_CONFIGURABLE 0x0008
#define PNP_REMOVABLE 0x0010
#define PNP_CONSOLE 0x0020
#define pnp_can_read(dev) (((dev)->protocol->get) && \
((dev)->capabilities & PNP_READ))
#define pnp_can_write(dev) (((dev)->protocol->set) && \
((dev)->capabilities & PNP_WRITE))
#define pnp_can_disable(dev) (((dev)->protocol->disable) && \
((dev)->capabilities & PNP_DISABLE))
#define pnp_can_disable(dev) (((dev)->protocol->disable) && \
((dev)->capabilities & PNP_DISABLE) && \
(!((dev)->capabilities & PNP_CONSOLE) || \
console_suspend_enabled))
#define pnp_can_configure(dev) ((!(dev)->active) && \
((dev)->capabilities & PNP_CONFIGURABLE))
#define pnp_can_suspend(dev) (((dev)->protocol->suspend) && \
(!((dev)->capabilities & PNP_CONSOLE) || \
console_suspend_enabled))
#ifdef CONFIG_ISAPNP
extern struct pnp_protocol isapnp_protocol;