Currently we call oz_pd_destroy() from softirq context, where we
try to destroy relevant data structures, as well we kill a tasklet
which always result in following kernel warning.
[12279.262194] Attempt to kill tasklet from interrupt
[12279.262202] Attempt to kill tasklet from interrupt
This patch defers deallocation of data structures to work queue.
Signed-off-by: Rupesh Gujare <rupesh.guj...@atmel.com>
---
drivers/staging/ozwpan/ozpd.c | 28 +++++++++++++++++++++++-----
drivers/staging/ozwpan/ozpd.h | 1 +
2 files changed, 24 insertions(+), 5 deletions(-)
diff --git a/drivers/staging/ozwpan/ozpd.c b/drivers/staging/ozwpan/ozpd.c
index 2514d79..06004c8 100644
--- a/drivers/staging/ozwpan/ozpd.c
+++ b/drivers/staging/ozwpan/ozpd.c
@@ -204,18 +204,16 @@ struct oz_pd *oz_pd_alloc(const u8 *mac_addr)
/*------------------------------------------------------------------------------
* Context: softirq or process
*/
-void oz_pd_destroy(struct oz_pd *pd)
+void oz_pd_free(struct work_struct *work)
{
struct list_head *e;
struct oz_tx_frame *f;
struct oz_isoc_stream *st;
struct oz_farewell *fwell;
+ struct oz_pd *pd;
oz_pd_dbg(pd, ON, "Destroying PD\n");
- if (hrtimer_active(&pd->timeout))
- hrtimer_cancel(&pd->timeout);
- if (hrtimer_active(&pd->heartbeat))
- hrtimer_cancel(&pd->heartbeat);
+ pd = container_of(work, struct oz_pd, workitem);
/*Disable timer tasklets*/
tasklet_kill(&pd->heartbeat_tasklet);
tasklet_kill(&pd->timeout_tasklet);
@@ -259,6 +257,26 @@ void oz_pd_destroy(struct oz_pd *pd)
}
/*------------------------------------------------------------------------------
+ * Context: softirq or Process
+ */
+void oz_pd_destroy(struct oz_pd *pd)
+{
+ int ret;
+
+ if (hrtimer_active(&pd->timeout))
+ hrtimer_cancel(&pd->timeout);
+ if (hrtimer_active(&pd->heartbeat))
+ hrtimer_cancel(&pd->heartbeat);
+
+ memset(&pd->workitem, 0, sizeof(pd->workitem));
+ INIT_WORK(&pd->workitem, oz_pd_free);
+ ret = schedule_work(&pd->workitem);
+
+ if (ret)
+ oz_pd_dbg(pd, ON, "failed to schedule workitem\n");
+}
+
+/*------------------------------------------------------------------------------
* Context: softirq-serialized
*/
int oz_services_start(struct oz_pd *pd, u16 apps, int resume)
diff --git a/drivers/staging/ozwpan/ozpd.h b/drivers/staging/ozwpan/ozpd.h
index 996ef65..12c7129 100644
--- a/drivers/staging/ozwpan/ozpd.h
+++ b/drivers/staging/ozwpan/ozpd.h
@@ -99,6 +99,7 @@ struct oz_pd {
u8 timeout_type;
struct tasklet_struct heartbeat_tasklet;
struct tasklet_struct timeout_tasklet;
+ struct work_struct workitem;
};
#define OZ_MAX_QUEUED_FRAMES 4
--
1.7.9.5
--
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