On Thu, Aug 15, 2024, Selvarasu Ganesan wrote: > This commit addresses an issue where the USB core could access an > invalid event buffer address during runtime suspend, potentially causing > SMMU faults and other memory issues in Exynos platforms. The problem > arises from the following sequence. > 1. In dwc3_gadget_suspend, there is a chance of a timeout when > moving the USB core to the halt state after clearing the > run/stop bit by software. > 2. In dwc3_core_exit, the event buffer is cleared regardless of > the USB core's status, which may lead to an SMMU faults and > other memory issues. if the USB core tries to access the event > buffer address. > > To prevent this hardware quirk on Exynos platforms, this commit ensures > that the event buffer address is not cleared by software when the USB > core is active during runtime suspend by checking its status before > clearing the buffer address. > > Cc: stable@xxxxxxxxxxxxxxx # v6.1+ Usually there's no "v" to indicate version. I'm not sure if it'll be an issue. Regardless, Acked-by: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx> Thanks, Thinh > Signed-off-by: Selvarasu Ganesan <selvarasu.g@xxxxxxxxxxx> > ---
