On 8/16/2024 3:25 PM, Greg KH wrote: > On Thu, Aug 15, 2024 at 12:18:31PM +0530, 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+ > Any hint as to what commit id this fixes? > > thanks, > > greg k-h Hi Greg, This issue is not related to any particular commit. The given fix is address a hardware quirk on the Exynos platform. And we require it to be backported on stable kernel 6.1 and above all stable kernel. Thanks, Selva >
