[SCSI] pm8001: simplify workqueue usage
pm8001 manages its own list of pending works and cancel them on device
free. It is unnecessarily complex and has a race condition - the
works are canceled but not synced, so the work could still be running
during and after the data structures are freed.
This patch simplifies workqueue usage.
* A driver specific workqueue pm8001_wq is created to serve these
work items.
* To avoid confusion, the "queue" suffixes are dropped from work items
and functions.
* Delayed queueing was never used. pm8001_work now uses work_struct
instead.
* The driver no longer keeps track of pending works. All pm8001_works
are queued to pm8001_wq and the workqueue is flushed as necessary.
flush_scheduled_work() usage is removed during conversion.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Jack Wang <jack_wang@usish.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
diff --git a/drivers/scsi/pm8001/pm8001_sas.h b/drivers/scsi/pm8001/pm8001_sas.h
index 7f064f9..bdb6b27 100644
--- a/drivers/scsi/pm8001/pm8001_sas.h
+++ b/drivers/scsi/pm8001/pm8001_sas.h
@@ -50,6 +50,7 @@
#include <linux/dma-mapping.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
+#include <linux/workqueue.h>
#include <scsi/libsas.h>
#include <scsi/scsi_tcq.h>
#include <scsi/sas_ata.h>
@@ -379,18 +380,16 @@
#ifdef PM8001_USE_TASKLET
struct tasklet_struct tasklet;
#endif
- struct list_head wq_list;
u32 logging_level;
u32 fw_status;
const struct firmware *fw_image;
};
-struct pm8001_wq {
- struct delayed_work work_q;
+struct pm8001_work {
+ struct work_struct work;
struct pm8001_hba_info *pm8001_ha;
void *data;
int handler;
- struct list_head entry;
};
struct pm8001_fw_image_header {
@@ -460,6 +459,9 @@
void *param3;
};
+/* pm8001 workqueue */
+extern struct workqueue_struct *pm8001_wq;
+
/******************** function prototype *********************/
int pm8001_tag_alloc(struct pm8001_hba_info *pm8001_ha, u32 *tag_out);
void pm8001_tag_init(struct pm8001_hba_info *pm8001_ha);