From 63c794845de126d36d75c7d992fa2e5221651b1b Mon Sep 17 00:00:00 2001 From: Jonathan Bell Date: Wed, 26 Oct 2022 17:46:44 +0100 Subject: [PATCH] drivers: dwc_otg: stop GCC from patching FIQ functions Configuring GCC to use task stack protector canaries means it will insert calls to check functions in FIQ code. This is bad, as a) the FIQ's stack is banked and b) the failure invokes __stack_chk_fail which eventually tries to call printk(). Printing to the console inside the FIQ is generally fatal. Add CFLAGS to stop this happening in FIQ code. Also catch one function where notrace wasn't specified. Signed-off-by: Jonathan Bell --- drivers/usb/host/dwc_otg/Makefile | 1 + drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.c | 2 +- 2 files changed, 2 insertions(+), 1 deletion(-) --- a/drivers/usb/host/dwc_otg/Makefile +++ b/drivers/usb/host/dwc_otg/Makefile @@ -28,6 +28,7 @@ ccflags-y += -DDWC_LINUX ccflags-y += $(CFI) ccflags-y += $(BUS_INTERFACE) #ccflags-y += -DDWC_DEV_SRPCAP +CFLAGS_dwc_otg_fiq_fsm.o += -fno-stack-protector obj-$(CONFIG_USB_DWCOTG) += dwc_otg.o --- a/drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.c +++ b/drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.c @@ -142,7 +142,7 @@ inline void fiq_fsm_spin_unlock(fiq_lock * fiq_fsm_restart_channel() - Poke channel enable bit for a split transaction * @channel: channel to re-enable */ -static void fiq_fsm_restart_channel(struct fiq_state *st, int n, int force) +static void notrace fiq_fsm_restart_channel(struct fiq_state *st, int n, int force) { hcchar_data_t hcchar = { .d32 = FIQ_READ(st->dwc_regs_base + HC_START + (HC_OFFSET * n) + HCCHAR) };