[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 <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

4 files changed, 12 insertions, 7 deletions

diff --git a/drivers/pcmcia/i82365.c b/drivers/pcmcia/i82365.c
index bd0308e89815..a2f05f485156 100644
--- a/drivers/pcmcia/i82365.c
+++ b/drivers/pcmcia/i82365.c
@@ -509,7 +509,8 @@ static irqreturn_t i365_count_irq(int irq, void *dev, struct pt_regs *regs)
 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);
@@ -561,7 +562,7 @@ static u_int __init isa_scan(u_short sock, u_int mask0)
     } 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 */
@@ -725,7 +726,7 @@ static void __init add_pcic(int ns, int type)
         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;
diff --git a/include/asm-xtensa/signal.h b/include/asm-xtensa/signal.h
index 5d6fc9cdf58d..a99c9aec64ec 100644
--- a/include/asm-xtensa/signal.h
+++ b/include/asm-xtensa/signal.h
@@ -118,9 +118,9 @@ typedef struct {
  * 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 */
diff --git a/include/linux/signal.h b/include/linux/signal.h
index 162a8fd10b29..70739f51a09f 100644
--- a/include/linux/signal.h
+++ b/include/linux/signal.h
@@ -14,10 +14,12 @@
  *
  * 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
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index ac766ad573e8..1279e3499534 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -246,8 +246,10 @@ int setup_irq(unsigned int irq, struct irqaction * new)
 
 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;
 }