[PATCH V2 2/3] PCI: rcar: Do not abort on too many inbound dma-ranges

[marek.vasut@gmail.com]

From: Marek Vasut <marek.vasut+renesas@gmail.com>

In case the "dma-ranges" DT property contains either too many ranges
or the range start address is unaligned in such a way that populating
the range into the controller requires multiple entries, a situation
may occur where all ranges cannot be loaded into the controller.

Currently, the driver refuses to probe in such a situation. Relax this
behavior, load as many ranges as possible and warn if some ranges do
not fit anymore.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Wolfram Sang <wsa@the-dreams.de>
Cc: linux-renesas-soc@vger.kernel.org
To: linux-pci@vger.kernel.org
---
V2: Update on top of 1/3
---
 drivers/pci/controller/pcie-rcar.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/controller/pcie-rcar.c b/drivers/pci/controller/pcie-rcar.c
index 0f501acbc3bb..ee760bdc7786 100644
--- a/drivers/pci/controller/pcie-rcar.c
+++ b/drivers/pci/controller/pcie-rcar.c
@@ -1049,8 +1049,9 @@ static int rcar_pcie_inbound_ranges(struct rcar_pcie *pcie,
 
 	while (cpu_addr < cpu_end) {
 		if (idx > MAX_NR_INBOUND_MAPS) {
-			dev_err(pcie->dev, "Failed to map inbound regions!\n");
-			return -EINVAL;
+			dev_warn(pcie->dev,
+				 "Too many inbound regions, not all are mapped.\n");
+			break;
 		}
 		/*
 		 * Set up 64-bit inbound regions as the range parser doesn't
-- 
2.20.1