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drivers/usb/dwc3: fix PCI parent check

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commit 40f8d17eed7533ed2bbb5e3cc680049b19411b2e upstream.

The sysdev_is_parent check was being used to infer PCI devices that have
the DMA mask set from the PCI capabilities, but sysdev_is_parent is also
used for non-PCI ACPI devices in which case the DMA mask would be the
bus default or as set by the _DMA method.

Without this fix the DMA mask would default to 32-bits and so allocation
would fail if there was no DRAM below 4GB.

Fixes: 47ce45906c ("usb: dwc3: leave default DMA for PCI devices")
Cc: stable <stable@kernel.org>
Signed-off-by: Jamie Iles <jamie.iles@oss.qualcomm.com>
Signed-off-by: Punit Agrawal <punit.agrawal@oss.qualcomm.com>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://patch.msgid.link/20251107104437.1602509-1-punit.agrawal@oss.qualcomm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jamie Iles
2025-11-07 10:44:37 +00:00
committed by Greg Kroah-Hartman
parent f8d1f16628
commit 4c257170c8
1 changed files with 2 additions and 1 deletions
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3
drivers/usb/dwc3/core.c
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@@ -25,6 +25,7 @@
#include <linux/of.h>
#include <linux/of_graph.h>
#include <linux/acpi.h>
#include <linux/pci.h>
#include <linux/pinctrl/consumer.h>
#include <linux/reset.h>
#include <linux/bitfield.h>
@@ -1990,7 +1991,7 @@ static int dwc3_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, dwc);
dwc3_cache_hwparams(dwc);
if (!dwc->sysdev_is_parent &&
if (!dev_is_pci(dwc->sysdev) &&
DWC3_GHWPARAMS0_AWIDTH(dwc->hwparams.hwparams0) == 64) {
ret = dma_set_mask_and_coherent(dwc->sysdev, DMA_BIT_MASK(64));
if (ret)