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PNP: Allow console to override ACPI device sleep 

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;