From 6cc1716102b55497dd557e8295a3177315332f9a Mon Sep 17 00:00:00 2001 From: Bhaumik Bhatt Date: Mon, 9 Nov 2020 12:47:31 -0800 Subject: bus: mhi: core: Remove MHI event ring IRQ handlers when powering down While powering down, the device may or may not acknowledge an MHI RESET issued by host for a graceful shutdown scenario and end up sending an incoming data packet after tasklets have been killed. If a rogue device sends this interrupt for a data transfer event ring update, it can result in a tasklet getting scheduled while a clean up is ongoing or has completed and cause access to freed memory leading to a NULL pointer exception. Remove the interrupt handlers for MHI event rings early on to avoid this scenario. Signed-off-by: Bhaumik Bhatt Reviewed-by: Manivannan Sadhasivam Signed-off-by: Manivannan Sadhasivam --- drivers/bus/mhi/core/pm.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/bus') diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c index ffbf6f539510..a671f585ce35 100644 --- a/drivers/bus/mhi/core/pm.c +++ b/drivers/bus/mhi/core/pm.c @@ -494,6 +494,7 @@ static void mhi_pm_disable_transition(struct mhi_controller *mhi_cntrl) for (i = 0; i < mhi_cntrl->total_ev_rings; i++, mhi_event++) { if (mhi_event->offload_ev) continue; + free_irq(mhi_cntrl->irq[mhi_event->irq], mhi_event); tasklet_kill(&mhi_event->task); } @@ -1164,7 +1165,7 @@ void mhi_power_down(struct mhi_controller *mhi_cntrl, bool graceful) /* Wait for shutdown to complete */ flush_work(&mhi_cntrl->st_worker); - mhi_deinit_free_irq(mhi_cntrl); + free_irq(mhi_cntrl->irq[0], mhi_cntrl); if (!mhi_cntrl->pre_init) { /* Free all allocated resources */ -- cgit v1.2.3