[PATCH] request_irq(): remove warnings from irq probing

- Add new SA_PROBEIRQ which suppresses the new sharing-mismatch warning.
Some drivers like to use request_irq() to find an unused interrupt slot.

- Use it in i82365.c

- Kill unused SA_PROBE.

Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/pcmcia/i82365.c

···
 static u_int __init test_irq(u_short sock, int irq)
 {
     debug(2, "  testing ISA irq %d\n", irq);
-    if (request_irq(irq, i365_count_irq, 0, "scan", i365_count_irq) != 0)
+    if (request_irq(irq, i365_count_irq, SA_PROBEIRQ, "scan",
+			i365_count_irq) != 0)
 	return 1;
     irq_hits = 0; irq_sock = sock;
     msleep(10);
···
     } else {
 	/* Fallback: just find interrupts that aren't in use */
 	for (i = 0; i < 16; i++)
-	    if ((mask0 & (1 << i)) && (_check_irq(i, 0) == 0))
+	    if ((mask0 & (1 << i)) && (_check_irq(i, SA_PROBEIRQ) == 0))
 		mask1 |= (1 << i);
 	printk("default");
 	/* If scan failed, default to polled status */
···
 	u_int cs_mask = mask & ((cs_irq) ? (1<<cs_irq) : ~(1<<12));
 	for (cs_irq = 15; cs_irq > 0; cs_irq--)
 	    if ((cs_mask & (1 << cs_irq)) &&
-		(_check_irq(cs_irq, 0) == 0))
+		(_check_irq(cs_irq, SA_PROBEIRQ) == 0))
 		break;
 	if (cs_irq) {
 	    grab_irq = 1;

include/asm-xtensa/signal.h

···
  * SA_INTERRUPT is also used by the irq handling routines.
  * SA_SHIRQ is for shared interrupt support on PCI and EISA.
  */
-#define SA_PROBE		SA_ONESHOT
 #define SA_SAMPLE_RANDOM	SA_RESTART
 #define SA_SHIRQ		0x04000000
+#define SA_PROBEIRQ		0x08000000
 #endif
 
 #define SIG_BLOCK          0	/* for blocking signals */

include/linux/signal.h

···
  *
  * SA_INTERRUPT is also used by the irq handling routines.
  * SA_SHIRQ is for shared interrupt support on PCI and EISA.
+ * SA_PROBEIRQ is set by callers when they expect sharing mismatches to occur
  */
-#define SA_PROBE		SA_ONESHOT
 #define SA_SAMPLE_RANDOM	SA_RESTART
 #define SA_SHIRQ		0x04000000
+#define SA_PROBEIRQ		0x08000000
+
 /*
  * As above, these correspond to the IORESOURCE_IRQ_* defines in
  * linux/ioport.h to select the interrupt line behaviour.  When

kernel/irq/manage.c

···
 
 mismatch:
 	spin_unlock_irqrestore(&desc->lock, flags);
-	printk(KERN_ERR "%s: irq handler mismatch\n", __FUNCTION__);
-	dump_stack();
+	if (!(new->flags & SA_PROBEIRQ)) {
+		printk(KERN_ERR "%s: irq handler mismatch\n", __FUNCTION__);
+		dump_stack();
+	}
 	return -EBUSY;
 }