mlx4_core: Distinguish multiple devices in /proc/interrupts

When the mlx4 driver uses the same name for interrupts for every
device in the system.  This can make it very confusing trying to work
out exactly which device MSI-X interrupts are for.  Change the driver
to add the PCI name of the device to the interrupt name.

Signed-off-by: Arputham Benjamin <abenjamin@sgi.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/net/mlx4/eq.c

@@ -40,6 +40,10 @@
 #include "mlx4.h"
 #include "fw.h"
 
+enum {
+	MLX4_IRQNAME_SIZE	= 64
+};
+
 enum {
 	MLX4_NUM_ASYNC_EQE	= 0x100,
 	MLX4_NUM_SPARE_EQE	= 0x80,
@@ -572,7 +576,9 @@ int mlx4_init_eq_table(struct mlx4_dev *dev)
 	priv->eq_table.clr_int  = priv->clr_base +
 		(priv->eq_table.inta_pin < 32 ? 4 : 0);
 
-	priv->eq_table.irq_names = kmalloc(16 * dev->caps.num_comp_vectors, GFP_KERNEL);
+	priv->eq_table.irq_names =
+		kmalloc(MLX4_IRQNAME_SIZE * (dev->caps.num_comp_vectors + 1),
+			GFP_KERNEL);
 	if (!priv->eq_table.irq_names) {
 		err = -ENOMEM;
 		goto err_out_bitmap;
@@ -595,17 +601,25 @@ int mlx4_init_eq_table(struct mlx4_dev *dev)
 		goto err_out_comp;
 
 	if (dev->flags & MLX4_FLAG_MSI_X) {
-		static const char async_eq_name[] = "mlx4-async";
 		const char *eq_name;
 
 		for (i = 0; i < dev->caps.num_comp_vectors + 1; ++i) {
 			if (i < dev->caps.num_comp_vectors) {
-				snprintf(priv->eq_table.irq_names + i * 16, 16,
-					 "mlx4-comp-%d", i);
-				eq_name = priv->eq_table.irq_names + i * 16;
-			} else
-				eq_name = async_eq_name;
+				snprintf(priv->eq_table.irq_names +
+					 i * MLX4_IRQNAME_SIZE,
+					 MLX4_IRQNAME_SIZE,
+					 "mlx4-comp-%d@pci:%s", i,
+					 pci_name(dev->pdev));
+			} else {
+				snprintf(priv->eq_table.irq_names +
+					 i * MLX4_IRQNAME_SIZE,
+					 MLX4_IRQNAME_SIZE,
+					 "mlx4-async@pci:%s",
+					 pci_name(dev->pdev));
+			}
 
+			eq_name = priv->eq_table.irq_names +
+				  i * MLX4_IRQNAME_SIZE;
 			err = request_irq(priv->eq_table.eq[i].irq,
 					  mlx4_msi_x_interrupt, 0, eq_name,
 					  priv->eq_table.eq + i);
@@ -615,8 +629,12 @@ int mlx4_init_eq_table(struct mlx4_dev *dev)
 			priv->eq_table.eq[i].have_irq = 1;
 		}
 	} else {
+		snprintf(priv->eq_table.irq_names,
+			 MLX4_IRQNAME_SIZE,
+			 DRV_NAME "@pci:%s",
+			 pci_name(dev->pdev));
 		err = request_irq(dev->pdev->irq, mlx4_interrupt,
-				  IRQF_SHARED, DRV_NAME, dev);
+				  IRQF_SHARED, priv->eq_table.irq_names, dev);
 		if (err)
 			goto err_out_async;