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Reading cell[0] on such platforms yields 0 for every context bank, causing all sessions to share SID 0 and corrupting IOVA address construction. Use of_property_read_u32_index() with of_n_addr_cells() - 1 as the index so the correct cell is read regardless of the parent address cell width. Signed-off-by: Vinayak Katoch --- drivers/misc/fastrpc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c index b29c1fd00de2..5c7bb56cf46d 100644 --- a/drivers/misc/fastrpc.c +++ b/drivers/misc/fastrpc.c @@ -2348,7 +2348,8 @@ static int fastrpc_cb_init(struct platform_device *pdev) if (!cctx) return -EINVAL; - if (of_property_read_u32(dev->of_node, "reg", &sid)) + if (of_property_read_u32_index(dev->of_node, "reg", + of_n_addr_cells(dev->of_node) - 1, &sid)) dev_info(dev, "FastRPC Session ID not specified in DT\n"); spin_lock_irqsave(&cctx->lock, flags); -- 2.34.1