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Commit 42a80370 authored by Pratham Pratap's avatar Pratham Pratap
Browse files

usb: f_gsi: Avoid gsi ep operations if run/stop is cleared 



The GSI operations for GSI_EP_OP_PREPARE_TRBS and GSI_EP_OP_STARTXFER
should not proceed if run/stop is cleared. Since ipa_work_handler runs
in worqueue context there might be a race between run/stop STARTXFER
and ENDXFER which can lead to SMMU fault. This change add checks to
avoid gsi ep operations when run/stop is cleared.

Change-Id: I9f64dee7020aec9cccfde8d247c0b53d9cc1f234
Signed-off-by: default avatarPratham Pratap <prathampratap@codeaurora.org>
parent 1520ba63

drivers/usb/dwc3/dwc3-msm.c

+25 −0
Original line number Diff line number Diff line
@@ -1504,6 +1504,11 @@ static int dwc3_msm_gsi_ep_op(struct usb_ep *ep, 


	switch (op) {

	case GSI_EP_OP_PREPARE_TRBS:

		if (!dwc->pullups_connected) {

			dbg_log_string("No Pullup\n");

			return -ESHUTDOWN;

		}



		request = (struct usb_gsi_request *)op_data;

		ret = gsi_prepare_trbs(ep, request);

		break;
@@ -1512,12 +1517,22 @@ static int dwc3_msm_gsi_ep_op(struct usb_ep *ep, 
		gsi_free_trbs(ep, request);

		break;

	case GSI_EP_OP_CONFIG:

		if (!dwc->pullups_connected) {

			dbg_log_string("No Pullup\n");

			return -ESHUTDOWN;

		}



		request = (struct usb_gsi_request *)op_data;

		spin_lock_irqsave(&dwc->lock, flags);

		gsi_configure_ep(ep, request);

		spin_unlock_irqrestore(&dwc->lock, flags);

		break;

	case GSI_EP_OP_STARTXFER:

		if (!dwc->pullups_connected) {

			dbg_log_string("No Pullup\n");

			return -ESHUTDOWN;

		}



		spin_lock_irqsave(&dwc->lock, flags);

		ret = gsi_startxfer_for_ep(ep);

		spin_unlock_irqrestore(&dwc->lock, flags);
@@ -1530,6 +1545,11 @@ static int dwc3_msm_gsi_ep_op(struct usb_ep *ep, 
		gsi_store_ringbase_dbl_info(ep, request);

		break;

	case GSI_EP_OP_ENABLE_GSI:

		if (!dwc->pullups_connected) {

			dbg_log_string("No Pullup\n");

			return -ESHUTDOWN;

		}



		gsi_enable(ep);

		break;

	case GSI_EP_OP_GET_CH_INFO:
@@ -1537,6 +1557,11 @@ static int dwc3_msm_gsi_ep_op(struct usb_ep *ep, 
		gsi_get_channel_info(ep, ch_info);

		break;

	case GSI_EP_OP_RING_DB:

		if (!dwc->pullups_connected) {

			dbg_log_string("No Pullup\n");

			return -ESHUTDOWN;

		}



		request = (struct usb_gsi_request *)op_data;

		gsi_ring_db(ep, request);

		break;

drivers/usb/gadget/function/f_gsi.c

+10 −3
Original line number Diff line number Diff line
@@ -841,8 +841,10 @@ static int gsi_ep_enable(struct f_gsi *gsi) 
			return ret;



		log_event_dbg("%s: Enable IN ep", __func__);

		usb_gsi_ep_op(gsi->d_port.in_ep,

		ret = usb_gsi_ep_op(gsi->d_port.in_ep,

				&gsi->d_port.in_request, GSI_EP_OP_CONFIG);

		if (ret)

			return ret;

	}



	if (gsi->d_port.out_ep && !gsi->d_port.out_ep->desc) {
@@ -852,8 +854,13 @@ static int gsi_ep_enable(struct f_gsi *gsi) 
			return ret;



		log_event_dbg("%s: Enable OUT ep", __func__);

		usb_gsi_ep_op(gsi->d_port.out_ep,

		ret = usb_gsi_ep_op(gsi->d_port.out_ep,

				&gsi->d_port.out_request, GSI_EP_OP_CONFIG);

		if (ret) {

			usb_gsi_ep_op(gsi->d_port.in_ep,

				&gsi->d_port.in_request, GSI_EP_OP_DISABLE);

			return ret;

		}

	}



	return 0;