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authorBhaumik Bhatt <bbhatt@codeaurora.org>2020-11-09 12:47:31 -0800
committerManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>2020-11-18 15:20:34 +0530
commit6cc1716102b55497dd557e8295a3177315332f9a (patch)
treecbc7b7e46c2434bcf52d0987024695399fd66006 /drivers/bus
parenta03c7a86e12721da9f6bb509dddda19fd9ae8c6c (diff)
downloadlinux-6cc1716102b55497dd557e8295a3177315332f9a.tar.bz2
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 <bbhatt@codeaurora.org> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Diffstat (limited to 'drivers/bus')
-rw-r--r--drivers/bus/mhi/core/pm.c3
1 files changed, 2 insertions, 1 deletions
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 */