[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>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/char/rtc.c b/drivers/char/rtc.c
index 66a7385bc34a..2eb53bea1866 100644
--- a/drivers/char/rtc.c
+++ b/drivers/char/rtc.c
@@ -958,6 +958,7 @@ static int __init rtc_init(void)
                 }
         }
 #endif
+        rtc_has_irq = 0;
         printk(KERN_ERR "rtc_init: no PC rtc found\n");
         return -EIO;
 
@@ -972,6 +973,7 @@ found:
          * 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 @@ no_irq:
         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 @@ no_irq:
 
         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 @@ no_irq:
         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 @@ no_irq:
         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);