On Sun, Oct 29, 2023 at 3:36 AM Hector Martin marcan@marcan.st wrote:
A long time ago, the USB code was interrupt-driven and used top-level timeout handling. This has long been obsolete, and that code is just broken dead cruft. HC drivers instead hardcode timeouts today.
We need to be able to specify timeouts explicitly to handle cases like USB hard disks spinning up, without having ridiculously long timeouts across the board (which would cause endless waiting when things go wrong anywhere else). So, it's time to rip out the old broken nonsense and actually pass through timeouts to USB host controller drivers, so they can be implemented properly.
This series adds the necessary top-level scaffolding for control/bulk timeouts, and implements them in xHCI. I didn't bother with interrupt transfers, since I figure those probably never need long timeouts anyway.
The platform I deal with only has xHCI, so I'll leave implementing this for EHCI/OHCI to someone else if anyone cares :)
This series needs to be applied after [1], since the xHCI changes depend on changes made there.
[1] https://lore.kernel.org/u-boot/20231029-usb-fixes-1-v2-0-623533f6316e@marcan...
Signed-off-by: Hector Martin marcan@marcan.st
Hector Martin (2): usb: Pass through timeout to drivers usb: xhci: Hook up timeouts
common/usb.c | 21 ++------------------- drivers/usb/host/ehci-hcd.c | 5 +++-- drivers/usb/host/ohci-hcd.c | 5 +++-- drivers/usb/host/r8a66597-hcd.c | 5 +++-- drivers/usb/host/usb-sandbox.c | 6 ++++-- drivers/usb/host/usb-uclass.c | 9 +++++---- drivers/usb/host/xhci-ring.c | 32 ++++++++++++++++++++------------ drivers/usb/host/xhci.c | 28 ++++++++++++++++------------ include/usb.h | 10 ++++++---- include/usb/xhci.h | 14 ++++++++++---- 10 files changed, 72 insertions(+), 63 deletions(-)
base-commit: 3d5d748e4d66b98109669c05d0c473fe67795801 change-id: 20231029-usb-fixes-5-ca87bbedb40c
Series LGTM.
Reviewed-by: Neal Gompa neal@gompa.dev