net: ipa: have gsi_irq_setup() return an error code

Change gsi_irq_setup() so it returns an error value, and introduce
gsi_irq_teardown() as its inverse.  Set the interrupt type (IRQ
rather than MSI) in gsi_irq_setup().

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ipa/gsi.c b/drivers/net/ipa/gsi.c
index a5d23a2..be069d7 100644 (file)
--- a/drivers/net/ipa/gsi.c
+++ b/drivers/net/ipa/gsi.c
@@ -1807,9 +1807,12 @@ static void gsi_channel_teardown(struct gsi *gsi)
        gsi_irq_disable(gsi);
 }
 
-/* Turn off all GSI interrupts initially; there is no gsi_irq_teardown() */
-static void gsi_irq_setup(struct gsi *gsi)
+/* Turn off all GSI interrupts initially */
+static int gsi_irq_setup(struct gsi *gsi)
 {
+       /* Writing 1 indicates IRQ interrupts; 0 would be MSI */
+       iowrite32(1, gsi->virt + GSI_CNTXT_INTSET_OFFSET);
+
        /* Disable all interrupt types */
        gsi_irq_type_update(gsi, 0);
 
@@ -1831,6 +1834,12 @@ static void gsi_irq_setup(struct gsi *gsi)
        }
 
        iowrite32(0, gsi->virt + GSI_CNTXT_GSI_IRQ_EN_OFFSET);
+
+       return 0;
+}
+
+static void gsi_irq_teardown(struct gsi *gsi)
+{
 }
 
 /* Get # supported channel and event rings; there is no gsi_ring_teardown() */
@@ -1891,25 +1900,34 @@ int gsi_setup(struct gsi *gsi)
                return -EIO;
        }
 
-       gsi_irq_setup(gsi);             /* No matching teardown required */
+       ret = gsi_irq_setup(gsi);
+       if (ret)
+               return ret;
 
        ret = gsi_ring_setup(gsi);      /* No matching teardown required */
        if (ret)
-               return ret;
+               goto err_irq_teardown;
 
        /* Initialize the error log */
        iowrite32(0, gsi->virt + GSI_ERROR_LOG_OFFSET);
 
-       /* Writing 1 indicates IRQ interrupts; 0 would be MSI */
-       iowrite32(1, gsi->virt + GSI_CNTXT_INTSET_OFFSET);
+       ret = gsi_channel_setup(gsi);
+       if (ret)
+               goto err_irq_teardown;
 
-       return gsi_channel_setup(gsi);
+       return 0;
+
+err_irq_teardown:
+       gsi_irq_teardown(gsi);
+
+       return ret;
 }
 
 /* Inverse of gsi_setup() */
 void gsi_teardown(struct gsi *gsi)
 {
        gsi_channel_teardown(gsi);
+       gsi_irq_teardown(gsi);
 }
 
 /* Initialize a channel's event ring */