If the serial console is an ACPI PNP device, the PNP bus attempts to
power-down the device, even though the no_console_suspend command line
parameter is specified (eg., debugging suspend/resume).
Add PNP_SUSPEND capability which is on by default, but when cleared,
prevents pnpacpi_suspend() (which is the ACPI PNP protocol ->suspend()
method).
Signed-off-by: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>
---
drivers/pnp/driver.c | 2 +-
drivers/pnp/pnpacpi/core.c | 2 +-
include/linux/pnp.h | 3 +++
3 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/pnp/driver.c b/drivers/pnp/driver.c
index f748cc8..4e57d33 100644
--- a/drivers/pnp/driver.c
+++ b/drivers/pnp/driver.c
@@ -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;
}
diff --git a/drivers/pnp/pnpacpi/core.c b/drivers/pnp/pnpacpi/core.c
index d2b780a..115bb73 100644
--- a/drivers/pnp/pnpacpi/core.c
+++ b/drivers/pnp/pnpacpi/core.c
@@ -253,7 +253,7 @@ static int __init pnpacpi_add_device(struct acpi_device *device)
dev->active = device->status.enabled;
if (acpi_has_method(device->handle, "_SRS"))
dev->capabilities |= PNP_CONFIGURABLE;
- dev->capabilities |= PNP_READ;
+ dev->capabilities |= PNP_READ | PNP_SUSPEND;
if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
dev->capabilities |= PNP_WRITE;
if (device->flags.removable)
diff --git a/include/linux/pnp.h b/include/linux/pnp.h
index 195aafc..5a5cbc2 100644
--- a/include/linux/pnp.h
+++ b/include/linux/pnp.h
@@ -309,6 +309,7 @@ struct pnp_fixup {
#define PNP_DISABLE 0x0004
#define PNP_CONFIGURABLE 0x0008
#define PNP_REMOVABLE 0x0010
+#define PNP_SUSPEND 0x0020
#define pnp_can_read(dev) (((dev)->protocol->get) && \
((dev)->capabilities & PNP_READ))
@@ -318,6 +319,8 @@ struct pnp_fixup {
((dev)->capabilities & PNP_DISABLE))
#define pnp_can_configure(dev) ((!(dev)->active) && \
((dev)->capabilities & PNP_CONFIGURABLE))
+#define pnp_can_suspend(dev) (((dev)->protocol->suspend) && \
+ ((dev)->capabilities & PNP_SUSPEND))
#ifdef CONFIG_ISAPNP
extern struct pnp_protocol isapnp_protocol;
--
2.1.3
--
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