PM / suspend: Abort suspend if somebody holds wakelock
Subsystems (2)
PATCH 1/1 PM / suspend: Abort suspend if somebody holds wakelock
There could be a scenario, where request_firmware() call results in user land process trying to load firmwares into memory and parallely one miscellaneous process is trying to invoke manual suspend and due to which user mode helper gets disabled during freezing of processes and that aborts loading of firmware even though request_firmware() thread has taken wakelock.
Although, we are checking for any wakeup event inside try_to_freeze_tasks() but that could be too late for the above scenario.
Let's add a check before freezing/disable user land process in suspend path.
--- kernel/power/process.c | 3 +++ 1 file changed, 3 insertions(+)
kernel/power/process.c +3 -0
@@ -124,6 +124,9 @@ int freeze_processes(void) {int error; +if (pm_wakeup_pending ()) +return -EBUSY ; + error =__usermodehelper_disable (UMH_FREEZING );if (error)return error;
Signature · 2 lines
Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
Rafael J. Wysocki
maintainerQuoted 8 lines · Mukesh Ojha
There could be a scenario, where
request_firmware()call results in user land process trying to load firmwares into memory and parallely one miscellaneous process is trying to invoke manual suspend and due to which user mode helper gets disabled during freezing of processes and that aborts loading of firmware even thoughrequest_firmware()thread has taken wakelock.
Quoted 6 lines
Although, we are checking for any wakeup event inside
try_to_freeze_tasks()but that could be too late for the above scenario.Let's add a check before freezing/disable user land process in suspend path.
If a laptop lid is closed and the system is expected to suspend, it must suspend.
This takes precedence over the loading of firmware. Sorry.
Quoted 23 lines
Signed-off-by Mukesh Ojha <[email protected]>--- kernel/power/process.c | 3 +++ 1 file changed, 3 insertions(+)kernel/power/process.c +3
-1@@ -124,6 +124,9 @@ int freeze_processes(void) {int error; +if (pm_wakeup_pending ()) +return -EBUSY ; + error =__usermodehelper_disable (UMH_FREEZING );if (error)return error; --Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project