[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>

1 files changed, 22 insertions, 3 deletions

diff --git a/arch/sparc64/kernel/irq.c b/arch/sparc64/kernel/irq.c
index 51b8875..2395609 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);