From: Zhang Yanmin <yanmin.zh...@intel.com>
pnp pnp_bus_suspend/_resume have an issue.
pnp_bus_suspend calls pnp_stop_dev to disable the device. With ACPI,
pnp_stop_dev turns off the dev usually. Then,
pnp_bus_suspend=>pnp_dev->protocol->suspend accesses the device and
suspend it again.
pnp_bus_resume has the similar issue.
Another issue is firmware might just provide _DIS, but no_STS method.
The patch fixes it by adding a checking. If there is
pnp_dev->protocol->suspend, pnp_bus_suspend doesn't call pnp_stop_dev.
Do the similar thing for _resume.
Signed-off-by: Zhang Yanmin <yanmin.zh...@intel.com>
Signed-off-by: Liu ShuoX <shuox....@intel.com>
---
drivers/pnp/driver.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/drivers/pnp/driver.c b/drivers/pnp/driver.c
index f748cc8..2512e47 100644
--- a/drivers/pnp/driver.c
+++ b/drivers/pnp/driver.c
@@ -176,7 +176,7 @@ static int __pnp_bus_suspend(struct device *dev,
pm_message_t state)
return error;
}
- if (pnp_can_disable(pnp_dev)) {
+ if (pnp_can_disable(pnp_dev) && !pnp_dev->protocol->suspend) {
error = pnp_stop_dev(pnp_dev);
if (error)
return error;
@@ -215,9 +215,7 @@ static int pnp_bus_resume(struct device *dev)
error = pnp_dev->protocol->resume(pnp_dev);
if (error)
return error;
- }
-
- if (pnp_can_write(pnp_dev)) {
+ } else if (pnp_can_write(pnp_dev)) {
error = pnp_start_dev(pnp_dev);
if (error)
return error;
--
1.8.3
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