[RFC/PATCH 3/6] DSPBRIDGE: remove mapping information in proc_unmap

[Ohad Ben-Cohen <ohad@wizery.com>]

Clean up all mapping information resources whenever
a buffer is unmapped.

Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
---
If you want, you can also reach me at <  ohadb at ti dot com  >.

 drivers/dsp/bridge/rmgr/proc.c |   43 ++++++++++++++++++++++++++++++++++++++++
 1 files changed, 43 insertions(+), 0 deletions(-)

diff --git a/drivers/dsp/bridge/rmgr/proc.c b/drivers/dsp/bridge/rmgr/proc.c
index b03232f..ebb11b1 100644
--- a/drivers/dsp/bridge/rmgr/proc.c
+++ b/drivers/dsp/bridge/rmgr/proc.c
@@ -169,6 +169,46 @@ static struct memory_map_info *add_mapping_info(struct proc_object *pr_obj,
 	return map_info;
 }
 
+static int match_exact_map_info(struct memory_map_info *map_info,
+					u32 dsp_addr, u32 size)
+{
+	return map_info->dsp_addr == dsp_addr &&
+		map_info->size == size;
+}
+
+static void remove_mapping_information(struct proc_object *pr_obj,
+					u32 dsp_addr, u32 size)
+{
+	struct memory_map_info *map_info;
+	struct list_head *iter;
+
+	pr_debug("%s: looking for virt 0x%x size 0x%x\n", __func__,
+							dsp_addr, size);
+
+	spin_lock(&pr_obj->maps_lock);
+	list_for_each(iter, &pr_obj->maps) {
+		map_info = list_entry(iter, struct memory_map_info, node);
+		pr_debug("%s: candidate: mpu_addr 0x%x virt 0x%x size 0x%x\n",
+						__func__,
+						map_info->mpu_addr,
+						map_info->dsp_addr,
+						map_info->size);
+
+		if (match_exact_map_info(map_info, dsp_addr, size)) {
+			pr_debug("%s: match, deleting map info\n", __func__);
+			list_del(&map_info->node);
+			kfree(map_info->pages);
+			kfree(map_info);
+			goto out;
+		}
+		pr_debug("%s: candidate didn't match\n", __func__);
+	}
+
+	pr_err("%s: failed to find given map info\n", __func__);
+out:
+	spin_unlock(&pr_obj->maps_lock);
+}
+
 /*
  *  ======== proc_attach ========
  *  Purpose:
@@ -1508,6 +1548,9 @@ dsp_status proc_un_map(void *hprocessor, void *map_addr,
 		status = (*p_proc_object->intf_fxns->pfn_brd_mem_un_map)
 		    (p_proc_object->hwmd_context, va_align, size_align);
 	}
+
+	remove_mapping_information(p_proc_object, va_align, size_align);
+
 	mutex_unlock(&proc_lock);
 	if (DSP_FAILED(status))
 		goto func_end;
-- 
1.6.3.3