linux-kernel - [PATCH] Revert "of/device: Really only set bus DMA mask when appropriate"

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Date:   Thu, 28 Feb 2019 22:33:36 +0000
From:   Alistair Francis <Alistair.Francis@....com>
To:     "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "robh@...nel.org" <robh@...nel.org>,
        "robin.murphy@....com" <robin.murphy@....com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "alistair23@...il.com" <alistair23@...il.com>,
        Alistair Francis <Alistair.Francis@....com>
Subject: [PATCH] Revert "of/device: Really only set bus DMA mask when
 appropriate"

This reverts commit 6778be4e520959659b27a441c06a84c9cb009085.

Reverting the commit fixes these error messages and an non-functioning
USB bus when attaching a USB to PCIe card to a RISC-V board:
    xhci_hcd 0000:03:00.0: Host took too long to start, waited 16000 microseconds.
    xhci_hcd 0000:03:00.0: startup error -19
    xhci_hcd 0000:03:00.0: USB bus 2 deregistered
    xhci_hcd 0000:03:00.0: WARNING: Host System Error
    xhci_hcd 0000:03:00.0: remove, state 1

Signed-off-by: Alistair Francis <alistair.francis@....com>
---
I'm not sure if this is the correct fix, it's possible something else is
wrong, but I wanted to get some feedback.

drivers/of/device.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/of/device.c b/drivers/of/device.c
index 3717f2a20d0d..8299f8055da7 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -149,11 +149,9 @@ int of_dma_configure(struct device *dev, struct device_node *np, bool force_dma)
 	 * set by the driver.
 	 */
 	mask = DMA_BIT_MASK(ilog2(dma_addr + size - 1) + 1);
+	dev->bus_dma_mask = mask;
 	dev->coherent_dma_mask &= mask;
 	*dev->dma_mask &= mask;
-	/* ...but only set bus mask if we found valid dma-ranges earlier */
-	if (!ret)
-		dev->bus_dma_mask = mask;
 
 	coherent = of_dma_is_coherent(np);
 	dev_dbg(dev, "device is%sdma coherent\n",
-- 
2.20.1