ahci: compile out msi/msix infrastructure

Quoting Arnd:
    The AHCI driver is used for some on-chip devices that do not use PCI
    for probing, and it can be built even when CONFIG_PCI is disabled, but
    that now results in a build failure:

    ata/libahci.c: In function 'ahci_host_activate_multi_irqs':
    ata/libahci.c:2475:4: error: invalid use of undefined type 'struct msix_entry'
    ata/libahci.c:2475:21: error: dereferencing pointer to incomplete type 'struct msix_entry'

Add ifdef CONFIG_PCI_MSI infrastructure to compile out the multi-msi and
multi-msix code.

Reported-by: Arnd Bergmann <arnd@arndb.de>
Tested--by: Arnd Bergmann <arnd@arndb.de>
[arnd: fix up pci enabled case]
Reported-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Fixes: d684a90d38e2 ("ahci: per-port msix support")
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
index 878470f..a4faa43 100644 (file)
--- a/drivers/ata/ahci.h
+++ b/drivers/ata/ahci.h
@@ -35,6 +35,7 @@
 #ifndef _AHCI_H
 #define _AHCI_H
 
+#include <linux/pci.h>
 #include <linux/clk.h>
 #include <linux/libata.h>
 #include <linux/phy/phy.h>
@@ -237,12 +238,18 @@ enum {
        AHCI_HFLAG_DELAY_ENGINE         = (1 << 15), /* do not start engine on
                                                        port start (wait until
                                                        error-handling stage) */
-       AHCI_HFLAG_MULTI_MSI            = (1 << 16), /* multiple PCI MSIs */
        AHCI_HFLAG_NO_DEVSLP            = (1 << 17), /* no device sleep */
        AHCI_HFLAG_NO_FBS               = (1 << 18), /* no FBS */
        AHCI_HFLAG_EDGE_IRQ             = (1 << 19), /* HOST_IRQ_STAT behaves as
                                                        Edge Triggered */
-       AHCI_HFLAG_MULTI_MSIX           = (1 << 20), /* per-port MSI-X */
+#ifdef CONFIG_PCI_MSI
+       AHCI_HFLAG_MULTI_MSI            = (1 << 20), /* multiple PCI MSIs */
+       AHCI_HFLAG_MULTI_MSIX           = (1 << 21), /* per-port MSI-X */
+#else
+       /* compile out MSI infrastructure */
+       AHCI_HFLAG_MULTI_MSI            = 0,
+       AHCI_HFLAG_MULTI_MSIX           = 0,
+#endif
 
        /* ap->flags bits */
 
@@ -355,6 +362,21 @@ struct ahci_host_priv {
        void                    (*start_engine)(struct ata_port *ap);
 };
 
+#ifdef CONFIG_PCI_MSI
+static inline int ahci_irq_vector(struct ahci_host_priv *hpriv, int port)
+{
+       if (hpriv->flags & AHCI_HFLAG_MULTI_MSIX)
+               return hpriv->msix[port].vector;
+       else
+               return hpriv->irq + port;
+}
+#else
+static inline int ahci_irq_vector(struct ahci_host_priv *hpriv, int port)
+{
+       return hpriv->irq;
+}
+#endif
+
 extern int ahci_ignore_sss;
 
 extern struct device_attribute *ahci_shost_attrs[];

diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 1b6c7cc..eda3cf2 100644 (file)
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -2469,12 +2469,7 @@ static int ahci_host_activate_multi_irqs(struct ata_host *host,
         */
        for (i = 0; i < host->n_ports; i++) {
                struct ahci_port_priv *pp = host->ports[i]->private_data;
-               int irq;
-
-               if (hpriv->flags & AHCI_HFLAG_MULTI_MSIX)
-                       irq = hpriv->msix[i].vector;
-               else
-                       irq = hpriv->irq + i;
+               int irq = ahci_irq_vector(hpriv, i);
 
                /* Do not receive interrupts sent by dummy ports */
                if (!pp) {