From: Bhaumik Bhatt Date: Tue, 29 Sep 2020 17:52:02 +0000 (+0530) Subject: bus: mhi: core: Abort suspends due to outgoing pending packets X-Git-Tag: v5.9.5~258 X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=5a4494029af98fcd345e209043a026b414821906;p=users%2Fdwmw2%2Flinux.git bus: mhi: core: Abort suspends due to outgoing pending packets [ Upstream commit 515847c557dd33167be86cb429fc0674a331bc88 ] Add the missing check to abort suspends if a client driver has pending outgoing packets to send to the device. This allows better utilization of the MHI bus wherein clients on the host are not left waiting for longer suspend or resume cycles to finish for data transfers. Reviewed-by: Manivannan Sadhasivam Signed-off-by: Bhaumik Bhatt Signed-off-by: Manivannan Sadhasivam Link: https://lore.kernel.org/r/20200929175218.8178-4-manivannan.sadhasivam@linaro.org Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c index 7960980780832..661d704c8093d 100644 --- a/drivers/bus/mhi/core/pm.c +++ b/drivers/bus/mhi/core/pm.c @@ -686,7 +686,8 @@ int mhi_pm_suspend(struct mhi_controller *mhi_cntrl) return -EIO; /* Return busy if there are any pending resources */ - if (atomic_read(&mhi_cntrl->dev_wake)) + if (atomic_read(&mhi_cntrl->dev_wake) || + atomic_read(&mhi_cntrl->pending_pkts)) return -EBUSY; /* Take MHI out of M2 state */ @@ -712,7 +713,8 @@ int mhi_pm_suspend(struct mhi_controller *mhi_cntrl) write_lock_irq(&mhi_cntrl->pm_lock); - if (atomic_read(&mhi_cntrl->dev_wake)) { + if (atomic_read(&mhi_cntrl->dev_wake) || + atomic_read(&mhi_cntrl->pending_pkts)) { write_unlock_irq(&mhi_cntrl->pm_lock); return -EBUSY; }