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Message-ID: <20160228124416.GA12689@amitoj-Inspiron-3542>
Date: Sun, 28 Feb 2016 18:14:16 +0530
From: Amitoj Kaur Chawla <amitoj1606@...il.com>
To: benjamin.romer@...sys.com, Jes.Sorensen@...hat.com,
erik.arfvidson@...sys.com, david.kershner@...sys.com,
jkc@...hat.com, Timothy.Sell@...sys.com, bryan.thompson@...sys.com,
dzickus@...hat.com, kenneth.depro@...sys.com,
gregkh@...uxfoundation.org, sparmaintainer@...sys.com,
devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Cc: tj@...nel.org, outreachy-kernel@...glegroups.com
Subject: [RFC] staging: unisys: visorbus: visorchipset: Remove
create_singlethread_workqueue()
With concurrency managed workqueues, use of dedicated workqueues
can be replaced by using system_wq. Drop periodic_controlvm_workqueue
by using system_wq.
Since there is only one work item periodic_controlvm_work and
different periodic_controlvm_works do not need to be ordered, increase
of concurrency level by switching to system_wq should not break anything.
cancel_delayed_work_sync() is used to ensure that work is not pending
or executing on any CPU.
Signed-off-by: Amitoj Kaur Chawla <amitoj1606@...il.com>
Acked-by: Tejun Heo <tj@...nel.org>
---
Only compile tested.
drivers/staging/unisys/visorbus/visorchipset.c | 23 ++++-------------------
1 file changed, 4 insertions(+), 19 deletions(-)
diff --git a/drivers/staging/unisys/visorbus/visorchipset.c b/drivers/staging/unisys/visorbus/visorchipset.c
index b75b063..c4c71c6 100644
--- a/drivers/staging/unisys/visorbus/visorchipset.c
+++ b/drivers/staging/unisys/visorbus/visorchipset.c
@@ -102,7 +102,6 @@ struct parser_context {
};
static struct delayed_work periodic_controlvm_work;
-static struct workqueue_struct *periodic_controlvm_workqueue;
static DEFINE_SEMAPHORE(notifier_lock);
static struct cdev file_cdev;
@@ -1913,8 +1912,7 @@ cleanup:
poll_jiffies = POLLJIFFIES_CONTROLVMCHANNEL_FAST;
}
- queue_delayed_work(periodic_controlvm_workqueue,
- &periodic_controlvm_work, poll_jiffies);
+ schedule_delayed_work(&periodic_controlvm_work, poll_jiffies);
}
static void
@@ -2011,8 +2009,7 @@ cleanup:
poll_jiffies = POLLJIFFIES_CONTROLVMCHANNEL_SLOW;
- queue_delayed_work(periodic_controlvm_workqueue,
- &periodic_controlvm_work, poll_jiffies);
+ schedule_delayed_work(&periodic_controlvm_work, poll_jiffies);
}
static void
@@ -2299,19 +2296,10 @@ visorchipset_init(struct acpi_device *acpi_device)
else
INIT_DELAYED_WORK(&periodic_controlvm_work,
controlvm_periodic_work);
- periodic_controlvm_workqueue =
- create_singlethread_workqueue("visorchipset_controlvm");
- if (!periodic_controlvm_workqueue) {
- POSTCODE_LINUX_2(CREATE_WORKQUEUE_FAILED_PC,
- DIAG_SEVERITY_ERR);
- rc = -ENOMEM;
- goto cleanup;
- }
most_recent_message_jiffies = jiffies;
poll_jiffies = POLLJIFFIES_CONTROLVMCHANNEL_FAST;
- queue_delayed_work(periodic_controlvm_workqueue,
- &periodic_controlvm_work, poll_jiffies);
+ schedule_delayed_work(&periodic_controlvm_work, poll_jiffies);
visorchipset_platform_device.dev.devt = major_dev;
if (platform_device_register(&visorchipset_platform_device) < 0) {
@@ -2346,10 +2334,7 @@ visorchipset_exit(struct acpi_device *acpi_device)
visorbus_exit();
- cancel_delayed_work(&periodic_controlvm_work);
- flush_workqueue(periodic_controlvm_workqueue);
- destroy_workqueue(periodic_controlvm_workqueue);
- periodic_controlvm_workqueue = NULL;
+ cancel_delayed_work_sync(&periodic_controlvm_work);
destroy_controlvm_payload_info(&controlvm_payload_info);
memset(&g_chipset_msg_hdr, 0, sizeof(struct controlvm_message_header));
--
1.9.1
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