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| author | WangYuli <wangyuli@uniontech.com> | 2025-01-07 21:38:54 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-01-11 17:02:36 +0100 |
| commit | 594c82329eef335ad90f5276ae0d2dff4d6d2668 (patch) | |
| tree | ac20ec39a9cefefb30aba54a8eb64887a3742545 /drivers/usb | |
| parent | 7d3934884babcfb1252c4296e0060c7a0749a429 (diff) | |
| download | linux-stable-594c82329eef335ad90f5276ae0d2dff4d6d2668.tar.gz linux-stable-594c82329eef335ad90f5276ae0d2dff4d6d2668.tar.bz2 linux-stable-594c82329eef335ad90f5276ae0d2dff4d6d2668.zip | |
usb: host: xhci-plat: Assign shared_hcd->rsrc_start
When inserting a USB device, examining hcd->rsrc_start can be
helpful in identifying which hcd is mounted, as the physical
address represented here is typically unique.
The following code snippet demonstrates this:
struct usb_hcd *hcd = bus_to_hcd(udev->bus);
unsigned long long usb_hcd_addr = (unsigned long long)hcd->rsrc_start;
However, this approach has limitations now. For USB hosts with an
MMIO interface, the effectiveness of this method is restricted to
USB 2.0.
Because commit 3429e91a661e ("usb: host: xhci: add platform driver
support") assigned res->start to hcd->rsrc_start. But
shared_hcd->rsrc_start remains unassigned, which is also necessary
in certain scenarios.
Fixes: 3429e91a661e ("usb: host: xhci: add platform driver support")
Co-developed-by: Xu Rao <raoxu@uniontech.com>
Signed-off-by: Xu Rao <raoxu@uniontech.com>
Signed-off-by: WangYuli <wangyuli@uniontech.com>
Link: https://lore.kernel.org/r/186B9F56972457B4+20250107133854.172309-1-wangyuli@uniontech.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/host/xhci-plat.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c index e6c9006bd568..457e839b9b53 100644 --- a/drivers/usb/host/xhci-plat.c +++ b/drivers/usb/host/xhci-plat.c @@ -329,6 +329,8 @@ int xhci_plat_probe(struct platform_device *pdev, struct device *sysdev, const s usb3_hcd->can_do_streams = 1; if (xhci->shared_hcd) { + xhci->shared_hcd->rsrc_start = hcd->rsrc_start; + xhci->shared_hcd->rsrc_len = hcd->rsrc_len; ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED); if (ret) goto put_usb3_hcd; |