msm: camera: mem_mgr: Add refcount to track in use buffers

The function cam_mem_mgr_release can unmap the buffers when in use.

This change prevents unmapping the buffers when in use.

CRs-Fixed: 3489559
Change-Id: I2e72e795d39ac15abfa56c19043c419a03686966
Signed-off-by: Shivakumar Malke <quic_smalke@quicinc.com>

drivers/cam_isp/cam_isp_context.c

@@ -966,6 +966,7 @@ static int cam_isp_ctx_dump_req(
 				CAM_ERR(CAM_ISP,
 					"Invalid offset exp %u actual %u",
 					req_isp->cfg[i].offset, (uint32_t)len);
+				cam_mem_put_cpu_buf(req_isp->cfg[i].handle);
 				return -EINVAL;
 			}
 			remain_len = len - req_isp->cfg[i].offset;
@@ -976,6 +977,7 @@ static int cam_isp_ctx_dump_req(
 					"Invalid len exp %u remain_len %u",
 					req_isp->cfg[i].len,
 					(uint32_t)remain_len);
+				cam_mem_put_cpu_buf(req_isp->cfg[i].handle);
 				return -EINVAL;
 			}
 
@@ -1001,6 +1003,7 @@ static int cam_isp_ctx_dump_req(
 					return rc;
 			} else
 				cam_cdm_util_dump_cmd_buf(buf_start, buf_end);
+			cam_mem_put_cpu_buf(req_isp->cfg[i].handle);
 		}
 	}
 	return rc;
@@ -5294,6 +5297,7 @@ hw_dump:
 		CAM_WARN(CAM_ISP,
 		    "Dump buffer overshoot len %zu offset %zu, ctx_idx: %u, link: 0x%x",
 		    buf_len, dump_info->offset, ctx->ctx_id, ctx->link_hdl);
+		cam_mem_put_cpu_buf(dump_info->buf_handle);
 		return -ENOSPC;
 	}
 
@@ -5306,6 +5310,7 @@ hw_dump:
 		CAM_WARN(CAM_ISP,
 		    "Dump buffer exhaust remain %zu min %u, ctx_idx: %u, link: 0x%x",
 		    remain_len, min_len, ctx->ctx_id, ctx->link_hdl);
+		cam_mem_put_cpu_buf(dump_info->buf_handle);
 		return -ENOSPC;
 	}
 
@@ -5411,10 +5416,12 @@ hw_dump:
 			&ife_dump_args);
 		dump_info->offset = ife_dump_args.offset;
 	}
+	cam_mem_put_cpu_buf(dump_info->buf_handle);
 	return rc;
 
 end:
 	spin_unlock_bh(&ctx->lock);
+	cam_mem_put_cpu_buf(dump_info->buf_handle);
 	return rc;
 }