net: ipa: explicitly disallow inter-EE interrupts

It is possible for other execution environments (EEs, like the modem)
to request changes to local (AP) channel or event ring state.  We do
not support this feature.

In gsi_irq_setup(), explicitly zero the mask that defines which
channels are permitted to generate inter-EE channel state change
interrupts.  Do the same for the event ring mask.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ipa/gsi.c

@@ -259,6 +259,8 @@ static void gsi_irq_setup(struct gsi *gsi)
 	iowrite32(0, gsi->virt + GSI_CNTXT_SRC_EV_CH_IRQ_MSK_OFFSET);
 	iowrite32(0, gsi->virt + GSI_CNTXT_GLOB_IRQ_EN_OFFSET);
 	iowrite32(0, gsi->virt + GSI_CNTXT_SRC_IEOB_IRQ_MSK_OFFSET);
+	iowrite32(0, gsi->virt + GSI_INTER_EE_SRC_CH_IRQ_OFFSET);
+	iowrite32(0, gsi->virt + GSI_INTER_EE_SRC_EV_CH_IRQ_OFFSET);
 }
 
 /* Turn off all GSI interrupts when we're all done */
@@ -307,8 +309,6 @@ static void gsi_irq_enable(struct gsi *gsi)
 	iowrite32(ERROR_INT_FMASK, gsi->virt + GSI_CNTXT_GLOB_IRQ_EN_OFFSET);
 	gsi->type_enabled_bitmap |= BIT(GSI_GLOB_EE);
 
-	/* We don't use inter-EE channel or event interrupts */
-
 	/* Never enable GSI_BREAK_POINT */
 	val = GSI_CNTXT_GSI_IRQ_ALL & ~BREAK_POINT_FMASK;
 	iowrite32(val, gsi->virt + GSI_CNTXT_GSI_IRQ_EN_OFFSET);