[PATCH] rtc: fx error case

Ensure RTC driver doesn't use its timer when it doesn't get to set it up
(as it cannot currently prevent other of its functions to be called from
outside when not built as a module - probably this should also be
addressed).

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/char/rtc.c

diff --git a/drivers/char/rtc.c b/drivers/char/rtc.c
index 66a7385..2eb53be 100644
--- a/drivers/char/rtc.c
+++ b/drivers/char/rtc.c
@@ -958,6 +958,7 @@
 		}
 	}
 #endif
+	rtc_has_irq = 0;
 	printk(KERN_ERR "rtc_init: no PC rtc found\n");
 	return -EIO;
 
@@ -972,6 +973,7 @@
 	 * PCI Slot 2 INTA# (and some INTx# in Slot 1).
 	 */
 	if (request_irq(rtc_irq, rtc_interrupt, IRQF_SHARED, "rtc", (void *)&rtc_port)) {
+		rtc_has_irq = 0;
 		printk(KERN_ERR "rtc: cannot register IRQ %d\n", rtc_irq);
 		return -EIO;
 	}
@@ -982,6 +984,9 @@
 	else
 		r = request_mem_region(RTC_PORT(0), RTC_IO_EXTENT, "rtc");
 	if (!r) {
+#ifdef RTC_IRQ
+		rtc_has_irq = 0;
+#endif
 		printk(KERN_ERR "rtc: I/O resource %lx is not free.\n",
 		       (long)(RTC_PORT(0)));
 		return -EIO;
@@ -996,6 +1001,7 @@
 
 	if(request_irq(RTC_IRQ, rtc_int_handler_ptr, IRQF_DISABLED, "rtc", NULL)) {
 		/* Yeah right, seeing as irq 8 doesn't even hit the bus. */
+		rtc_has_irq = 0;
 		printk(KERN_ERR "rtc: IRQ %d is not free.\n", RTC_IRQ);
 		if (RTC_IOMAPPED)
 			release_region(RTC_PORT(0), RTC_IO_EXTENT);
@@ -1012,6 +1018,7 @@
 	if (misc_register(&rtc_dev)) {
 #ifdef RTC_IRQ
 		free_irq(RTC_IRQ, NULL);
+		rtc_has_irq = 0;
 #endif
 		release_region(RTC_PORT(0), RTC_IO_EXTENT);
 		return -ENODEV;
@@ -1021,6 +1028,7 @@
 	if (!ent) {
 #ifdef RTC_IRQ
 		free_irq(RTC_IRQ, NULL);
+		rtc_has_irq = 0;
 #endif
 		release_region(RTC_PORT(0), RTC_IO_EXTENT);
 		misc_deregister(&rtc_dev);