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rtc-rs5c313.c: add error handling to avoid hardware hangup 

Add error processing.  Hanging up by an infinite loop is evaded.

Signed-off-by: kogiidena <kogiidena@eggplant.ddo.jp>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
kogiidena 2007-05-10 22:22:57 -07:00 committed by Linus Torvalds
parent 5a6a078950
commit 4ac24b3ba9
1 changed files with 18 additions and 1 deletions
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19
drivers/rtc/rtc-rs5c313.c
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@ -212,7 +212,9 @@ static inline void rs5c313_write_intintvreg(unsigned char data)
static int rs5c313_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
int data;
int cnt;
cnt = 0;
while (1) {
RS5C313_CEENABLE; /* CE:H */
@ -225,6 +227,10 @@ static int rs5c313_rtc_read_time(struct device *dev, struct rtc_time *tm)
RS5C313_CEDISABLE;
ndelay(700); /* CE:L */
if (cnt++ > 100) {
dev_err(dev, "%s: timeout error\n", __FUNCTION__);
return -EIO;
}
}
data = rs5c313_read_reg(RS5C313_ADDR_SEC);
@ -266,7 +272,9 @@ static int rs5c313_rtc_read_time(struct device *dev, struct rtc_time *tm)
static int rs5c313_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
int data;
int cnt;
cnt = 0;
/* busy check. */
while (1) {
RS5C313_CEENABLE; /* CE:H */
@ -279,6 +287,11 @@ static int rs5c313_rtc_set_time(struct device *dev, struct rtc_time *tm)
RS5C313_MISCOP;
RS5C313_CEDISABLE;
ndelay(700); /* CE:L */
if (cnt++ > 100) {
dev_err(dev, "%s: timeout error\n", __FUNCTION__);
return -EIO;
}
}
data = BIN2BCD(tm->tm_sec);
@ -317,6 +330,7 @@ static int rs5c313_rtc_set_time(struct device *dev, struct rtc_time *tm)
static void rs5c313_check_xstp_bit(void)
{
struct rtc_time tm;
int cnt;
RS5C313_CEENABLE; /* CE:H */
if (rs5c313_read_cntreg() & RS5C313_CNTREG_WTEN_XSTP) {
@ -326,8 +340,11 @@ static void rs5c313_check_xstp_bit(void)
rs5c313_write_cntreg(0x07);
/* busy check. */
while (rs5c313_read_cntreg() & RS5C313_CNTREG_ADJ_BSY)
for (cnt = 0; cnt < 100; cnt++) {
if (!(rs5c313_read_cntreg() & RS5C313_CNTREG_ADJ_BSY))
break;
RS5C313_MISCOP;
}
memset(&tm, 0, sizeof(struct rtc_time));
tm.tm_mday = 1;