MIPS: Octeon: Don't request interrupts for unused IPI mailbox bits.

We only use the three low-order mailbox bits.  Leave the upper bits alone
for possible use by drivers and other software.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2090/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/cavium-octeon/smp.c

@@ -37,7 +37,7 @@ static irqreturn_t mailbox_interrupt(int irq, void *dev_id)
 	uint64_t action;
 
 	/* Load the mailbox register to figure out what we're supposed to do */
-	action = cvmx_read_csr(CVMX_CIU_MBOX_CLRX(coreid));
+	action = cvmx_read_csr(CVMX_CIU_MBOX_CLRX(coreid)) & 0xffff;
 
 	/* Clear the mailbox to clear the interrupt */
 	cvmx_write_csr(CVMX_CIU_MBOX_CLRX(coreid), action);
@@ -200,16 +200,15 @@ void octeon_prepare_cpus(unsigned int max_cpus)
 	if (labi->labi_signature != LABI_SIGNATURE)
 		panic("The bootloader version on this board is incorrect.");
 #endif
-
-	cvmx_write_csr(CVMX_CIU_MBOX_CLRX(cvmx_get_core_num()), 0xffffffff);
+	/*
+	 * Only the low order mailbox bits are used for IPIs, leave
+	 * the other bits alone.
+	 */
+	cvmx_write_csr(CVMX_CIU_MBOX_CLRX(cvmx_get_core_num()), 0xffff);
 	if (request_irq(OCTEON_IRQ_MBOX0, mailbox_interrupt, IRQF_DISABLED,
-			"mailbox0", mailbox_interrupt)) {
+			"SMP-IPI", mailbox_interrupt)) {
 		panic("Cannot request_irq(OCTEON_IRQ_MBOX0)\n");
 	}
-	if (request_irq(OCTEON_IRQ_MBOX1, mailbox_interrupt, IRQF_DISABLED,
-			"mailbox1", mailbox_interrupt)) {
-		panic("Cannot request_irq(OCTEON_IRQ_MBOX1)\n");
-	}
 }
 
 /**