[PATCH] rtc: bunch of drivers: fix 'no irq' case handing

Anton Vorontsov
2008-11-06T17:41:23Z

This patch fixes bunch of irq checking misuses. Most drivers were getting
irq via platform_get_irq(), which returns -ENXIO or r->start. Platforms
may specify r->start = 0 to emphasize 'no irq' case, and drivers should
handle this correctly.

rtc-cmos.c is special. It is using PNP and platform bindings. Hopefully
nobody is using PNP IRQ 0 for RTC. So the changes should be safe.

rtc-sh.c is using platform_get_irq, but was storing a result into an
unsigned type, then was checking for < 0. This is fixed now.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
---
drivers/rtc/rtc-at32ap700x.c | 4 ++--
drivers/rtc/rtc-cmos.c | 2 +-
drivers/rtc/rtc-ds1511.c | 19 +++++++++----------
drivers/rtc/rtc-ds1553.c | 15 +++++++--------
drivers/rtc/rtc-m48t59.c | 2 +-
drivers/rtc/rtc-sh.c | 10 ++++++----
drivers/rtc/rtc-stk17ta8.c | 15 +++++++--------
drivers/rtc/rtc-twl4030.c | 5 +++--
drivers/rtc/rtc-vr41xx.c | 8 ++++----
9 files changed, 40 insertions(+), 40 deletions(-)

diff --git a/drivers/rtc/rtc-at32ap700x.c b/drivers/rtc/rtc-at32ap700x.c
index 90b9a65..e1ec33e 100644
--- a/drivers/rtc/rtc-at32ap700x.c
+++ b/drivers/rtc/rtc-at32ap700x.c
@@ -205,7 +205,7 @@ static int __init at32_rtc_probe(struct platform_device *pdev)
{
struct resource *regs;
struct rtc_at32ap700x *rtc;
- int irq = -1;
+ int irq;
int ret;

rtc = kzalloc(sizeof(struct rtc_at32ap700x), GFP_KERNEL);
@@ -222,7 +222,7 @@ static int __init at32_rtc_probe(struct platform_device *pdev)
}

irq = platform_get_irq(pdev, 0);
- if (irq < 0) {
+ if (irq <= 0) {
dev_dbg(&pdev->dev, "could not get irq\n");
ret = -ENXIO;
goto out;
diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index 5549231..521706d 100644
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -58,7 +58,7 @@ struct cmos_rtc {
};

/* both platform and pnp busses use negative numbers for invalid irqs */
-#define is_valid_irq(n) ((n) >= 0)
+#define is_valid_irq(n) ((n) > 0)

static const char driver_name[] = "rtc_cmos";

diff --git a/drivers/rtc/rtc-ds1511.c b/drivers/rtc/rtc-ds1511.c
index 25caada..23a07fe 100644
--- a/drivers/rtc/rtc-ds1511.c
+++ b/drivers/rtc/rtc-ds1511.c
@@ -326,9 +326,9 @@ ds1511_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
struct platform_device *pdev = to_platform_device(dev);
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);

- if (pdata->irq < 0) {
+ if (pdata->irq <= 0)
return -EINVAL;
- }
+
pdata->alrm_mday = alrm->time.tm_mday;
pdata->alrm_hour = alrm->time.tm_hour;
pdata->alrm_min = alrm->time.tm_min;
@@ -346,9 +346,9 @@ ds1511_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
struct platform_device *pdev = to_platform_device(dev);
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);

- if (pdata->irq < 0) {
+ if (pdata->irq <= 0)
return -EINVAL;
- }
+
alrm->time.tm_mday = pdata->alrm_mday < 0 ? 0 : pdata->alrm_mday;
alrm->time.tm_hour = pdata->alrm_hour < 0 ? 0 : pdata->alrm_hour;
alrm->time.tm_min = pdata->alrm_min < 0 ? 0 : pdata->alrm_min;
@@ -385,7 +385,7 @@ ds1511_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
struct platform_device *pdev = to_platform_device(dev);
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);

- if (pdata->irq < 0) {
+ if (pdata->irq <= 0) {
return -ENOIOCTLCMD; /* fall back into rtc-dev's emulation */
}
switch (cmd) {
@@ -503,7 +503,6 @@ ds1511_rtc_probe(struct platform_device *pdev)
if (!pdata) {
return -ENOMEM;
}
- pdata->irq = -1;
pdata->size = res->end - res->start + 1;
if (!request_mem_region(res->start, pdata->size, pdev->name)) {
ret = -EBUSY;
@@ -545,13 +544,13 @@ ds1511_rtc_probe(struct platform_device *pdev)
* if the platform has an interrupt in mind for this device,
* then by all means, set it
*/
- if (pdata->irq >= 0) {
+ if (pdata->irq > 0) {
rtc_read(RTC_CMD1);
if (request_irq(pdata->irq, ds1511_interrupt,
IRQF_DISABLED | IRQF_SHARED, pdev->name, pdev) < 0) {

dev_warn(&pdev->dev, "interrupt not available.\n");
- pdata->irq = -1;
+ pdata->irq = 0;
}
}

@@ -572,7 +571,7 @@ ds1511_rtc_probe(struct platform_device *pdev)
if (pdata->rtc) {
rtc_device_unregister(pdata->rtc);
}
- if (pdata->irq >= 0) {
+ if (pdata->irq > 0) {
free_irq(pdata->irq, pdev);
}
if (ds1511_base) {
@@ -595,7 +594,7 @@ ds1511_rtc_remove(struct platform_device *pdev)
sysfs_remove_bin_file(&pdev->dev.kobj, &ds1511_nvram_attr);
rtc_device_unregister(pdata->rtc);
pdata->rtc = NULL;
- if (pdata->irq >= 0) {
+ if (pdata->irq > 0) {
/*
* disable the alarm interrupt
*/
diff --git a/drivers/rtc/rtc-ds1553.c b/drivers/rtc/rtc-ds1553.c
index b9475cd..38d472b 100644
--- a/drivers/rtc/rtc-ds1553.c
+++ b/drivers/rtc/rtc-ds1553.c
@@ -162,7 +162,7 @@ static int ds1553_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
struct platform_device *pdev = to_platform_device(dev);
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);

- if (pdata->irq < 0)
+ if (pdata->irq <= 0)
return -EINVAL;
pdata->alrm_mday = alrm->time.tm_mday;
pdata->alrm_hour = alrm->time.tm_hour;
@@ -179,7 +179,7 @@ static int ds1553_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
struct platform_device *pdev = to_platform_device(dev);
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);

- if (pdata->irq < 0)
+ if (pdata->irq <= 0)
return -EINVAL;
alrm->time.tm_mday = pdata->alrm_mday < 0 ? 0 : pdata->alrm_mday;
alrm->time.tm_hour = pdata->alrm_hour < 0 ? 0 : pdata->alrm_hour;
@@ -213,7 +213,7 @@ static int ds1553_rtc_ioctl(struct device *dev, unsigned int cmd,
struct platform_device *pdev = to_platform_device(dev);
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);

- if (pdata->irq < 0)
+ if (pdata->irq <= 0)
return -ENOIOCTLCMD; /* fall back into rtc-dev's emulation */
switch (cmd) {
case RTC_AIE_OFF:
@@ -301,7 +301,6 @@ static int __devinit ds1553_rtc_probe(struct platform_device *pdev)
pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
- pdata->irq = -1;
if (!request_mem_region(res->start, RTC_REG_SIZE, pdev->name)) {
ret = -EBUSY;
goto out;
@@ -327,13 +326,13 @@ static int __devinit ds1553_rtc_probe(struct platform_device *pdev)
if (readb(ioaddr + RTC_FLAGS) & RTC_FLAGS_BLF)
dev_warn(&pdev->dev, "voltage-low detected.\n");

- if (pdata->irq >= 0) {
+ if (pdata->irq > 0) {
writeb(0, ioaddr + RTC_INTERRUPTS);
if (request_irq(pdata->irq, ds1553_rtc_interrupt,
IRQF_DISABLED | IRQF_SHARED,
pdev->name, pdev) < 0) {
dev_warn(&pdev->dev, "interrupt not available.\n");
- pdata->irq = -1;
+ pdata->irq = 0;
}
}

@@ -353,7 +352,7 @@ static int __devinit ds1553_rtc_probe(struct platform_device *pdev)
out:
if (pdata->rtc)
rtc_device_unregister(pdata->rtc);
- if (pdata->irq >= 0)
+ if (pdata->irq > 0)
free_irq(pdata->irq, pdev);
if (ioaddr)
iounmap(ioaddr);
@@ -369,7 +368,7 @@ static int __devexit ds1553_rtc_remove(struct platform_device *pdev)

sysfs_remove_bin_file(&pdev->dev.kobj, &ds1553_nvram_attr);
rtc_device_unregister(pdata->rtc);
- if (pdata->irq >= 0) {
+ if (pdata->irq > 0) {
writeb(0, pdata->ioaddr + RTC_INTERRUPTS);
free_irq(pdata->irq, pdev);
}
diff --git a/drivers/rtc/rtc-m48t59.c b/drivers/rtc/rtc-m48t59.c
index 43afb7a..33921a6 100644
--- a/drivers/rtc/rtc-m48t59.c
+++ b/drivers/rtc/rtc-m48t59.c
@@ -450,7 +450,7 @@ static int __devinit m48t59_rtc_probe(struct platform_device *pdev)
* the mode without IRQ.
*/
m48t59->irq = platform_get_irq(pdev, 0);
- if (m48t59->irq < 0)
+ if (m48t59->irq <= 0)
m48t59->irq = NO_IRQ;

if (m48t59->irq != NO_IRQ) {
diff --git a/drivers/rtc/rtc-sh.c b/drivers/rtc/rtc-sh.c
index aaf9d6a..5ed66ac 100644
--- a/drivers/rtc/rtc-sh.c
+++ b/drivers/rtc/rtc-sh.c
@@ -89,7 +89,9 @@ struct sh_rtc {
void __iomem *regbase;
unsigned long regsize;
struct resource *res;
- unsigned int alarm_irq, periodic_irq, carry_irq;
+ int alarm_irq;
+ int periodic_irq;
+ int carry_irq;
struct rtc_device *rtc_dev;
spinlock_t lock;
unsigned long capabilities; /* See asm-sh/rtc.h for cap bits */
@@ -578,7 +580,7 @@ static int __devinit sh_rtc_probe(struct platform_device *pdev)

/* get periodic/carry/alarm irqs */
ret = platform_get_irq(pdev, 0);
- if (unlikely(ret < 0)) {
+ if (unlikely(ret <= 0)) {
ret = -ENOENT;
dev_err(&pdev->dev, "No IRQ for period\n");
goto err_badres;
@@ -586,7 +588,7 @@ static int __devinit sh_rtc_probe(struct platform_device *pdev)
rtc->periodic_irq = ret;

ret = platform_get_irq(pdev, 1);
- if (unlikely(ret < 0)) {
+ if (unlikely(ret <= 0)) {
ret = -ENOENT;
dev_err(&pdev->dev, "No IRQ for carry\n");
goto err_badres;
@@ -594,7 +596,7 @@ static int __devinit sh_rtc_probe(struct platform_device *pdev)
rtc->carry_irq = ret;

ret = platform_get_irq(pdev, 2);
- if (unlikely(ret < 0)) {
+ if (unlikely(ret <= 0)) {
ret = -ENOENT;
dev_err(&pdev->dev, "No IRQ for alarm\n");
goto err_badres;
diff --git a/drivers/rtc/rtc-stk17ta8.c b/drivers/rtc/rtc-stk17ta8.c
index f4cd46e..dc0b622 100644
--- a/drivers/rtc/rtc-stk17ta8.c
+++ b/drivers/rtc/rtc-stk17ta8.c
@@ -170,7 +170,7 @@ static int stk17ta8_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
struct platform_device *pdev = to_platform_device(dev);
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);

- if (pdata->irq < 0)
+ if (pdata->irq <= 0)
return -EINVAL;
pdata->alrm_mday = alrm->time.tm_mday;
pdata->alrm_hour = alrm->time.tm_hour;
@@ -187,7 +187,7 @@ static int stk17ta8_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
struct platform_device *pdev = to_platform_device(dev);
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);

- if (pdata->irq < 0)
+ if (pdata->irq <= 0)
return -EINVAL;
alrm->time.tm_mday = pdata->alrm_mday < 0 ? 0 : pdata->alrm_mday;
alrm->time.tm_hour = pdata->alrm_hour < 0 ? 0 : pdata->alrm_hour;
@@ -221,7 +221,7 @@ static int stk17ta8_rtc_ioctl(struct device *dev, unsigned int cmd,
struct platform_device *pdev = to_platform_device(dev);
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);

- if (pdata->irq < 0)
+ if (pdata->irq <= 0)
return -ENOIOCTLCMD; /* fall back into rtc-dev's emulation */
switch (cmd) {
case RTC_AIE_OFF:
@@ -303,7 +303,6 @@ static int __init stk17ta8_rtc_probe(struct platform_device *pdev)
pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
- pdata->irq = -1;
if (!request_mem_region(res->start, RTC_REG_SIZE, pdev->name)) {
ret = -EBUSY;
goto out;
@@ -329,13 +328,13 @@ static int __init stk17ta8_rtc_probe(struct platform_device *pdev)
if (readb(ioaddr + RTC_FLAGS) & RTC_FLAGS_PF)
dev_warn(&pdev->dev, "voltage-low detected.\n");

- if (pdata->irq >= 0) {
+ if (pdata->irq > 0) {
writeb(0, ioaddr + RTC_INTERRUPTS);
if (request_irq(pdata->irq, stk17ta8_rtc_interrupt,
IRQF_DISABLED | IRQF_SHARED,
pdev->name, pdev) < 0) {
dev_warn(&pdev->dev, "interrupt not available.\n");
- pdata->irq = -1;
+ pdata->irq = 0;
}
}

@@ -355,7 +354,7 @@ static int __init stk17ta8_rtc_probe(struct platform_device *pdev)
out:
if (pdata->rtc)
rtc_device_unregister(pdata->rtc);
- if (pdata->irq >= 0)
+ if (pdata->irq > 0)
free_irq(pdata->irq, pdev);
if (ioaddr)
iounmap(ioaddr);
@@ -371,7 +370,7 @@ static int __devexit stk17ta8_rtc_remove(struct platform_device *pdev)

sysfs_remove_bin_file(&pdev->dev.kobj, &stk17ta8_nvram_attr);
rtc_device_unregister(pdata->rtc);
- if (pdata->irq >= 0) {
+ if (pdata->irq > 0) {
writeb(0, pdata->ioaddr + RTC_INTERRUPTS);
free_irq(pdata->irq, pdev);
}
diff --git a/drivers/rtc/rtc-twl4030.c b/drivers/rtc/rtc-twl4030.c
index abe87a4..3952d91 100644
--- a/drivers/rtc/rtc-twl4030.c
+++ b/drivers/rtc/rtc-twl4030.c
@@ -19,6 +19,7 @@
*/

#include <linux/kernel.h>
+#include <linux/errno.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
@@ -415,8 +416,8 @@ static int __devinit twl4030_rtc_probe(struct platform_device *pdev)
int irq = platform_get_irq(pdev, 0);
u8 rd_reg;

- if (irq < 0)
- return irq;
+ if (irq <= 0)
+ return -EINVAL;

rtc = rtc_device_register(pdev->name,
&pdev->dev, &twl4030_rtc_ops, THIS_MODULE);
diff --git a/drivers/rtc/rtc-vr41xx.c b/drivers/rtc/rtc-vr41xx.c
index 834dcc6..57b7aac 100644
--- a/drivers/rtc/rtc-vr41xx.c
+++ b/drivers/rtc/rtc-vr41xx.c
@@ -84,8 +84,8 @@ static DEFINE_SPINLOCK(rtc_lock);
static char rtc_name[] = "RTC";
static unsigned long periodic_count;
static unsigned int alarm_enabled;
-static int aie_irq = -1;
-static int pie_irq = -1;
+static int aie_irq;
+static int pie_irq;

static inline unsigned long read_elapsed_second(void)
{
@@ -360,7 +360,7 @@ static int __devinit rtc_probe(struct platform_device *pdev)
spin_unlock_irq(&rtc_lock);

aie_irq = platform_get_irq(pdev, 0);
- if (aie_irq < 0 || aie_irq >= nr_irqs) {
+ if (aie_irq <= 0) {
retval = -EBUSY;
goto err_device_unregister;
}
@@ -371,7 +371,7 @@ static int __devinit rtc_probe(struct platform_device *pdev)
goto err_device_unregister;

pie_irq = platform_get_irq(pdev, 1);
- if (pie_irq < 0 || pie_irq >= nr_irqs)
+ if (pie_irq <= 0)
goto err_free_irq;

retval = request_irq(pie_irq, rtclong1_interrupt, IRQF_DISABLED,
--
1.5.6.3