diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.19/950-0367-dwc_otg-fix-locking-around-dequeueing-and-killing-UR.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.19/950-0367-dwc_otg-fix-locking-around-dequeueing-and-killing-UR.patch | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0367-dwc_otg-fix-locking-around-dequeueing-and-killing-UR.patch b/target/linux/brcm2708/patches-4.19/950-0367-dwc_otg-fix-locking-around-dequeueing-and-killing-UR.patch new file mode 100644 index 0000000000..53e2c98ce5 --- /dev/null +++ b/target/linux/brcm2708/patches-4.19/950-0367-dwc_otg-fix-locking-around-dequeueing-and-killing-UR.patch @@ -0,0 +1,63 @@ +From ea7ff2070d564858c445cfdbd883ea00927c0ada Mon Sep 17 00:00:00 2001 +From: P33M <p33m@github.com> +Date: Tue, 9 Apr 2019 16:40:48 +0100 +Subject: [PATCH] dwc_otg: fix locking around dequeueing and killing + URBs + +kill_urbs_in_qh_list() is practically only ever called with the fiq lock +already held, so don't spinlock twice in the case where we need to cancel +an isochronous transfer. + +Also fix up a case where the global interrupt register could be read with +the fiq lock not held. + +Fixes the deadlock seen in https://github.com/raspberrypi/linux/issues/2907 +--- + drivers/usb/host/dwc_otg/dwc_otg_cil_intr.c | 9 +++++++-- + drivers/usb/host/dwc_otg/dwc_otg_hcd.c | 4 ---- + 2 files changed, 7 insertions(+), 6 deletions(-) + +--- a/drivers/usb/host/dwc_otg/dwc_otg_cil_intr.c ++++ b/drivers/usb/host/dwc_otg/dwc_otg_cil_intr.c +@@ -1344,16 +1344,21 @@ static inline uint32_t dwc_otg_read_comm + */ + gintmsk_common.b.portintr = 1; + } +- gintsts.d32 = DWC_READ_REG32(&core_if->core_global_regs->gintsts); +- gintmsk.d32 = DWC_READ_REG32(&core_if->core_global_regs->gintmsk); + if(fiq_enable) { + local_fiq_disable(); ++ fiq_fsm_spin_lock(&hcd->fiq_state->lock); ++ gintsts.d32 = DWC_READ_REG32(&core_if->core_global_regs->gintsts); ++ gintmsk.d32 = DWC_READ_REG32(&core_if->core_global_regs->gintmsk); + /* Pull in the interrupts that the FIQ has masked */ + gintmsk.d32 |= ~(hcd->fiq_state->gintmsk_saved.d32); + gintmsk.d32 |= gintmsk_common.d32; + /* for the upstairs function to reenable - have to read it here in case FIQ triggers again */ + reenable_gintmsk->d32 = gintmsk.d32; ++ fiq_fsm_spin_unlock(&hcd->fiq_state->lock); + local_fiq_enable(); ++ } else { ++ gintsts.d32 = DWC_READ_REG32(&core_if->core_global_regs->gintsts); ++ gintmsk.d32 = DWC_READ_REG32(&core_if->core_global_regs->gintmsk); + } + + gahbcfg.d32 = DWC_READ_REG32(&core_if->core_global_regs->gahbcfg); +--- a/drivers/usb/host/dwc_otg/dwc_otg_hcd.c ++++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd.c +@@ -195,15 +195,11 @@ static void kill_urbs_in_qh_list(dwc_otg + * but not yet been through the IRQ handler. + */ + if (fiq_fsm_enable && (hcd->fiq_state->channel[qh->channel->hc_num].fsm != FIQ_PASSTHROUGH)) { +- local_fiq_disable(); +- fiq_fsm_spin_lock(&hcd->fiq_state->lock); + qh->channel->halt_status = DWC_OTG_HC_XFER_URB_DEQUEUE; + qh->channel->halt_pending = 1; + if (hcd->fiq_state->channel[n].fsm == FIQ_HS_ISOC_TURBO || + hcd->fiq_state->channel[n].fsm == FIQ_HS_ISOC_SLEEPING) + hcd->fiq_state->channel[n].fsm = FIQ_HS_ISOC_ABORTED; +- fiq_fsm_spin_unlock(&hcd->fiq_state->lock); +- local_fiq_enable(); + } else { + dwc_otg_hc_halt(hcd->core_if, qh->channel, + DWC_OTG_HC_XFER_URB_DEQUEUE); |