[SPARC64]: Fix several bugs in MSI handling.

1) sun4{u,v}_build_msi() have improper return value handling.

   We should always return negative error codes, instead of
   using the magic value "0" which could in fact be a valid
   MSI number.

2) sun4{u,v}_build_msi() should return -ENOMEM instead of
   calling prom_prom() halt with kzalloc() of the interrupt
   data fails.

3) We 'remembered' the MSI number using a singleton in the
   struct device archdata area, this doesn't work for MSI-X
   which can cause multiple MSIs assosciated with one device.

   Delete that archdata member, and instead store the MSI
   number in the IRQ chip data area.

Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 30 insertions, 14 deletions

diff --git a/arch/sparc64/kernel/irq.c b/arch/sparc64/kernel/irq.c
index 51b8875a13a8..23956096b3bf 100644
--- a/arch/sparc64/kernel/irq.c
+++ b/arch/sparc64/kernel/irq.c
@@ -217,8 +217,27 @@ struct irq_handler_data {
         void            (*pre_handler)(unsigned int, void *, void *);
         void            *pre_handler_arg1;
         void            *pre_handler_arg2;
+
+        u32             msi;
 };
 
+void sparc64_set_msi(unsigned int virt_irq, u32 msi)
+{
+        struct irq_handler_data *data = get_irq_chip_data(virt_irq);
+
+        if (data)
+                data->msi = msi;
+}
+
+u32 sparc64_get_msi(unsigned int virt_irq)
+{
+        struct irq_handler_data *data = get_irq_chip_data(virt_irq);
+
+        if (data)
+                return data->msi;
+        return 0xffffffff;
+}
+
 static inline struct ino_bucket *virt_irq_to_bucket(unsigned int virt_irq)
 {
         unsigned int real_irq = virt_to_real_irq(virt_irq);
@@ -741,7 +760,7 @@ unsigned int sun4v_build_msi(u32 devhandle, unsigned int *virt_irq_p,
                         break;
         }
         if (devino >= msi_end)
-                return 0;
+                return -ENOSPC;
 
         sysino = sun4v_devino_to_sysino(devhandle, devino);
         bucket = &ivector_table[sysino];
@@ -755,8 +774,8 @@ unsigned int sun4v_build_msi(u32 devhandle, unsigned int *virt_irq_p,
 
         data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
         if (unlikely(!data)) {
-                prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n");
-                prom_halt();
+                virt_irq_free(*virt_irq_p);
+                return -ENOMEM;
         }
         set_irq_chip_data(bucket->virt_irq, data);
 
diff --git a/arch/sparc64/kernel/pci.c b/arch/sparc64/kernel/pci.c
index 3d93e9203ba2..139b4cff8019 100644
--- a/arch/sparc64/kernel/pci.c
+++ b/arch/sparc64/kernel/pci.c
@@ -393,7 +393,6 @@ struct pci_dev *of_create_pci_dev(struct pci_pbm_info *pbm,
         sd->host_controller = pbm;
         sd->prom_node = node;
         sd->op = of_find_device_by_node(node);
-        sd->msi_num = 0xffffffff;
 
         sd = &sd->op->dev.archdata;
         sd->iommu = pbm->iommu;
diff --git a/arch/sparc64/kernel/pci_sun4v.c b/arch/sparc64/kernel/pci_sun4v.c
index 466f4aa8fc82..da724b13e89e 100644
--- a/arch/sparc64/kernel/pci_sun4v.c
+++ b/arch/sparc64/kernel/pci_sun4v.c
@@ -940,13 +940,13 @@ static int pci_sun4v_setup_msi_irq(unsigned int *virt_irq_p,
         if (msi_num < 0)
                 return msi_num;
 
-        devino = sun4v_build_msi(pbm->devhandle, virt_irq_p,
-                                 pbm->msiq_first_devino,
-                                 (pbm->msiq_first_devino +
-                                  pbm->msiq_num));
-        err = -ENOMEM;
-        if (!devino)
+        err = sun4v_build_msi(pbm->devhandle, virt_irq_p,
+                              pbm->msiq_first_devino,
+                              (pbm->msiq_first_devino +
+                               pbm->msiq_num));
+        if (err < 0)
                 goto out_err;
+        devino = err;
 
         msiqid = ((devino - pbm->msiq_first_devino) +
                   pbm->msiq_first);
@@ -971,7 +971,7 @@ static int pci_sun4v_setup_msi_irq(unsigned int *virt_irq_p,
         if (pci_sun4v_msi_setvalid(pbm->devhandle, msi_num, HV_MSIVALID_VALID))
                 goto out_err;
 
-        pdev->dev.archdata.msi_num = msi_num;
+        sparc64_set_msi(*virt_irq_p, msi_num);
 
         if (entry->msi_attrib.is_64) {
                 msg.address_hi = pbm->msi64_start >> 32;
@@ -993,8 +993,6 @@ static int pci_sun4v_setup_msi_irq(unsigned int *virt_irq_p,
 
 out_err:
         free_msi(pbm, msi_num);
-        sun4v_destroy_msi(*virt_irq_p);
-        *virt_irq_p = 0;
         return err;
 
 }
@@ -1006,7 +1004,7 @@ static void pci_sun4v_teardown_msi_irq(unsigned int virt_irq,
         unsigned long msiqid, err;
         unsigned int msi_num;
 
-        msi_num = pdev->dev.archdata.msi_num;
+        msi_num = sparc64_get_msi(virt_irq);
         err = pci_sun4v_msi_getmsiq(pbm->devhandle, msi_num, &msiqid);
         if (err) {
                 printk(KERN_ERR "%s: getmsiq gives error %lu\n",