From 3eb583a6d0aee952715d34f2bbf58db52c5e7c5e Mon Sep 17 00:00:00 2001 From: Manivannan Sadhasivam Date: Tue, 24 Mar 2020 11:40:47 +0530 Subject: bus: mhi: core: Drop the references to mhi_dev in mhi_destroy_device() For some scenarios like controller suspend and resume, mhi_destroy_device() will get called without mhi_unregister_controller(). In that case, the references to the mhi_dev created for the channels will not be dropped but the channels will be destroyed as per the spec. This will cause issue during resume as the channels will not be created due to the fact that mhi_dev is not NULL. Hence, this change decrements the refcount for mhi_dev in mhi_destroy_device() for concerned channels and also sets mhi_dev to NULL in release_device(). Reported-by: Carl Huang Reviewed-by: Jeffrey Hugo Signed-off-by: Manivannan Sadhasivam Link: https://lore.kernel.org/r/20200324061050.14845-5-manivannan.sadhasivam@linaro.org Signed-off-by: Greg Kroah-Hartman --- drivers/bus/mhi/core/init.c | 12 ++++++++++++ drivers/bus/mhi/core/main.c | 13 +++++++++++++ 2 files changed, 25 insertions(+) (limited to 'drivers/bus') diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c index f6e3c16225a7..b38359c480ea 100644 --- a/drivers/bus/mhi/core/init.c +++ b/drivers/bus/mhi/core/init.c @@ -1028,6 +1028,18 @@ static void mhi_release_device(struct device *dev) { struct mhi_device *mhi_dev = to_mhi_device(dev); + /* + * We need to set the mhi_chan->mhi_dev to NULL here since the MHI + * devices for the channels will only get created if the mhi_dev + * associated with it is NULL. This scenario will happen during the + * controller suspend and resume. + */ + if (mhi_dev->ul_chan) + mhi_dev->ul_chan->mhi_dev = NULL; + + if (mhi_dev->dl_chan) + mhi_dev->dl_chan->mhi_dev = NULL; + kfree(mhi_dev); } diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c index fa1c9000fc6c..eb4256b81406 100644 --- a/drivers/bus/mhi/core/main.c +++ b/drivers/bus/mhi/core/main.c @@ -244,6 +244,19 @@ int mhi_destroy_device(struct device *dev, void *data) if (mhi_dev->dev_type == MHI_DEVICE_CONTROLLER) return 0; + /* + * For the suspend and resume case, this function will get called + * without mhi_unregister_controller(). Hence, we need to drop the + * references to mhi_dev created for ul and dl channels. We can + * be sure that there will be no instances of mhi_dev left after + * this. + */ + if (mhi_dev->ul_chan) + put_device(&mhi_dev->ul_chan->mhi_dev->dev); + + if (mhi_dev->dl_chan) + put_device(&mhi_dev->dl_chan->mhi_dev->dev); + dev_dbg(&mhi_cntrl->mhi_dev->dev, "destroy device for chan:%s\n", mhi_dev->chan_name); -- cgit v1.2.3