[media] v4l2-mem2mem: Don't schedule the context if abort job is called

When the current context is running,
1] If release is called, it waits until the job is finished.
2] As soon as the job is finished, v4l2_mem_ctx_release()tries to
   release the vb2 queues.
3] But if the current context can be scheduled in the v4l2_m2m_job_finish()
   it schedules the context and tries to call device_run().
4] As the release() and device_run() sequence can't be predicted sometimes
   device_run() may get empty vb2 buffers.

This patch adds the ABORT state to the job_flags. Once the job_abort() or
release() is called on the context, the same context will not be scheduled in
the v4l2_m2m_job_finish().

Signed-off-by: Shaik Ameer Basha <shaik.ameer@samsung.com>
Signed-off-by: Kamil Debski <k.debski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c
index 796de33..73035ee 100644 (file)
--- a/drivers/media/v4l2-core/v4l2-mem2mem.c
+++ b/drivers/media/v4l2-core/v4l2-mem2mem.c
@@ -41,6 +41,8 @@ module_param(debug, bool, 0644);
 #define TRANS_QUEUED           (1 << 0)
 /* Instance is currently running in hardware */
 #define TRANS_RUNNING          (1 << 1)
+/* Instance is currently aborting */
+#define TRANS_ABORT            (1 << 2)
 
 
 /* Offset base for buffers on the destination queue - used to distinguish
@@ -221,6 +223,14 @@ static void v4l2_m2m_try_schedule(struct v4l2_m2m_ctx *m2m_ctx)
        }
 
        spin_lock_irqsave(&m2m_dev->job_spinlock, flags_job);
+
+       /* If the context is aborted then don't schedule it */
+       if (m2m_ctx->job_flags & TRANS_ABORT) {
+               spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
+               dprintk("Aborted context\n");
+               return;
+       }
+
        if (m2m_ctx->job_flags & TRANS_QUEUED) {
                spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags_job);
                dprintk("On job queue already\n");
@@ -280,6 +290,8 @@ static void v4l2_m2m_cancel_job(struct v4l2_m2m_ctx *m2m_ctx)
 
        m2m_dev = m2m_ctx->m2m_dev;
        spin_lock_irqsave(&m2m_dev->job_spinlock, flags);
+
+       m2m_ctx->job_flags |= TRANS_ABORT;
        if (m2m_ctx->job_flags & TRANS_RUNNING) {
                spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
                m2m_dev->m2m_ops->job_abort(m2m_ctx->priv);