nold/hekate
1
0
Fork 0
mirror of https://github.com/CTCaer/hekate synced 2024-12-22 11:21:23 +00:00
Code Issues Projects Releases Packages Wiki Activity

bdk: usb: fix a race condition in USB2 stack

Browse source 
When RAM is slow (no training), it's possible to have the stack failing to negotiate configuration successfully.

The race condition is caused by not flushing cache before sending a configuration packet reply.
Although, cache is write-through, this needs to happen.
This commit is contained in:
CTCaer 2022-06-14 18:41:33 +03:00
parent 3fa01a1975
commit 605f270f98
1 changed files with 3 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
bdk/usb/usbd.c
View file

@ -785,13 +785,13 @@ static int _usbd_ep_operation(usb_ep_t endpoint, u8 *buf, u32 len, u32 sync_time
AHB_GIZMO(AHB_AHB_MEM_PREFETCH_CFG1) |= MEM_PREFETCH_ENABLE;
if (direction == USB_DIR_IN)
{
prime_bit = USB2D_ENDPT_STATUS_TX_OFFSET << actual_ep;
bpmp_mmu_maintenance(BPMP_MMU_MAINT_CLEAN_WAY, false);
}
else
prime_bit = USB2D_ENDPT_STATUS_RX_OFFSET << actual_ep;
// Flush data before priming EP.
bpmp_mmu_maintenance(BPMP_MMU_MAINT_CLEAN_WAY, false);
// Prime endpoint.
usbd_otg->regs->endptprime |= prime_bit; // USB2_CONTROLLER_USB2D_ENDPTPRIME.