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Subject[PATCH 1/2] RTC driver init adjustment
This patch
- conditionalizes procfs code upon CONFIG_PROC_FS (to reduce code size when
that option is not enabled)
- makes initialization no longer fail when the procfs entry can't be allocated
(namely would initialization always have failed when CONFIG_PROC_FS was not
set)
- moves the formerly file-scope static variable rtc_int_handler_ptr into the
only function using it, and makes it automatic.

Signed-off-by: Jan Beulich <jbeulich@novell.com>

--- linux-2.6.19/drivers/char/rtc.c 2006-12-08 13:03:35.000000000 +0100
+++ 2.6.19-rtc-cleanup/drivers/char/rtc.c 2006-12-08 13:07:42.000000000 +0100
@@ -113,7 +113,7 @@ static int rtc_has_irq = 1;
#define hpet_set_rtc_irq_bit(arg) 0
#define hpet_rtc_timer_init() do { } while (0)
#define hpet_rtc_dropped_irq() 0
-static inline irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id) {return 0;}
+static irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id) {return 0;}
#else
extern irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id);
#endif
@@ -165,7 +165,9 @@ static void mask_rtc_irq_bit(unsigned ch
}
#endif

+#ifdef CONFIG_PROC_FS
static int rtc_proc_open(struct inode *inode, struct file *file);
+#endif

/*
* Bits in rtc_status. (6 bits of room for future expansion)
@@ -906,6 +908,7 @@ static struct miscdevice rtc_dev = {
.fops = &rtc_fops,
};

+#ifdef CONFIG_PROC_FS
static const struct file_operations rtc_proc_fops = {
.owner = THIS_MODULE,
.open = rtc_proc_open,
@@ -913,14 +916,13 @@ static const struct file_operations rtc_
.llseek = seq_lseek,
.release = single_release,
};
-
-#if defined(RTC_IRQ) && !defined(__sparc__)
-static irq_handler_t rtc_int_handler_ptr;
#endif

static int __init rtc_init(void)
{
+#ifdef CONFIG_PROC_FS
struct proc_dir_entry *ent;
+#endif
#if defined(__alpha__) || defined(__mips__)
unsigned int year, ctrl;
char *guess = NULL;
@@ -932,9 +934,11 @@ static int __init rtc_init(void)
struct sparc_isa_bridge *isa_br;
struct sparc_isa_device *isa_dev;
#endif
-#endif
-#ifndef __sparc__
+#else
void *r;
+#ifdef RTC_IRQ
+ irq_handler_t rtc_int_handler_ptr;
+#endif
#endif

#ifdef __sparc__
@@ -1024,17 +1028,13 @@ no_irq:
return -ENODEV;
}

+#ifdef CONFIG_PROC_FS
ent = create_proc_entry("driver/rtc", 0, NULL);
- if (!ent) {
-#ifdef RTC_IRQ
- free_irq(RTC_IRQ, NULL);
- rtc_has_irq = 0;
+ if (ent)
+ ent->proc_fops = &rtc_proc_fops;
+ else
+ printk(KERN_WARNING "rtc: Failed to register with procfs.\n");
#endif
- release_region(RTC_PORT(0), RTC_IO_EXTENT);
- misc_deregister(&rtc_dev);
- return -ENOMEM;
- }
- ent->proc_fops = &rtc_proc_fops;

#if defined(__alpha__) || defined(__mips__)
rtc_freq = HZ;
@@ -1167,6 +1167,7 @@ static void rtc_dropped_irq(unsigned lon
}
#endif

+#ifdef CONFIG_PROC_FS
/*
* Info exported via "/proc/driver/rtc".
*/
@@ -1251,6 +1252,7 @@ static int rtc_proc_open(struct inode *i
{
return single_open(file, rtc_proc_show, NULL);
}
+#endif

void rtc_get_rtc_time(struct rtc_time *rtc_tm)
{

-
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