github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-24 15:12:13 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

usb: dwc3: qcom: Add shutdown handler

Browse Source 
Currently during system reboot, SMMU disables its translations
while devices like USB may still be actively using DMA buffers.
This can lead to NOC errors and system crashes due to invalid
memory access.

Address this by adding a shutdown callback to dwc3-qcom, which
ensures proper teardown of UDC stack and prevents DWC3 controller
from accessing memory after SMMU translation is disabled. Reuse
the existing remove callback for this purpose.

Signed-off-by: Prashanth K <prashanth.k@oss.qualcomm.com>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/20250725062158.2418961-1-prashanth.k@oss.qualcomm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Prashanth K 2025-07-25 11:51:58 +05:30 committed by Greg Kroah-Hartman
parent 8f5ae30d69
commit 784ad808ae
1 changed files with 6 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/usb/dwc3/dwc3-qcom.c
View File

@ -764,11 +764,14 @@ static void dwc3_qcom_remove(struct platform_device *pdev)
struct dwc3 *dwc = platform_get_drvdata(pdev);
struct dwc3_qcom *qcom = to_dwc3_qcom(dwc);
if (pm_runtime_resume_and_get(qcom->dev) < 0)
return;
dwc3_core_remove(&qcom->dwc);
clk_bulk_disable_unprepare(qcom->num_clocks, qcom->clks);
dwc3_qcom_interconnect_exit(qcom);
pm_runtime_put_noidle(qcom->dev);
}
static int dwc3_qcom_pm_suspend(struct device *dev)
@ -873,6 +876,7 @@ MODULE_DEVICE_TABLE(of, dwc3_qcom_of_match);
static struct platform_driver dwc3_qcom_driver = {
.probe = dwc3_qcom_probe,
.remove = dwc3_qcom_remove,
.shutdown = dwc3_qcom_remove,
.driver = {
.name = "dwc3-qcom",
.pm = pm_ptr(&dwc3_qcom_dev_pm_ops),