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drivers/power/ds2780_battery.c: add a nolock function to w1 interface

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Adds a nolock function to the w1 interface to avoid locking the
mutex if needed.

Signed-off-by: Clifton Barnes <cabarnes@indesign-llc.com>
Cc: Evgeniy Polyakov <zbr@ioremap.net>
Cc: <stable@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Clifton Barnes 2011-11-02 13:39:52 -07:00 committed by Linus Torvalds
parent 853eee72f7
commit 9fe678fa2f
2 changed files with 38 additions and 14 deletions
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50
drivers/w1/slaves/w1_ds2780.c
View file

@ -26,20 +26,14 @@
#include "../w1_family.h"
#include "w1_ds2780.h"
int w1_ds2780_io(struct device *dev, char *buf, int addr, size_t count,
int io)
static int w1_ds2780_do_io(struct device *dev, char *buf, int addr,
size_t count, int io)
{
struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
if (!dev)
return -ENODEV;
if (addr > DS2780_DATA_SIZE || addr < 0)
return 0;
mutex_lock(&sl->master->mutex);
if (addr > DS2780_DATA_SIZE || addr < 0) {
count = 0;
goto out;
}
count = min_t(int, count, DS2780_DATA_SIZE - addr);
if (w1_reset_select_slave(sl) == 0) {
@ -47,7 +41,6 @@ int w1_ds2780_io(struct device *dev, char *buf, int addr, size_t count,
w1_write_8(sl->master, W1_DS2780_WRITE_DATA);
w1_write_8(sl->master, addr);
w1_write_block(sl->master, buf, count);
/* XXX w1_write_block returns void, not n_written */
} else {
w1_write_8(sl->master, W1_DS2780_READ_DATA);
w1_write_8(sl->master, addr);
@ -55,13 +48,42 @@ int w1_ds2780_io(struct device *dev, char *buf, int addr, size_t count,
}
}
out:
mutex_unlock(&sl->master->mutex);
return count;
}
int w1_ds2780_io(struct device *dev, char *buf, int addr, size_t count,
int io)
{
struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
int ret;
if (!dev)
return -ENODEV;
mutex_lock(&sl->master->mutex);
ret = w1_ds2780_do_io(dev, buf, addr, count, io);
mutex_unlock(&sl->master->mutex);
return ret;
}
EXPORT_SYMBOL(w1_ds2780_io);
int w1_ds2780_io_nolock(struct device *dev, char *buf, int addr, size_t count,
int io)
{
int ret;
if (!dev)
return -ENODEV;
ret = w1_ds2780_do_io(dev, buf, addr, count, io);
return ret;
}
EXPORT_SYMBOL(w1_ds2780_io_nolock);
int w1_ds2780_eeprom_cmd(struct device *dev, int addr, int cmd)
{
struct w1_slave *sl = container_of(dev, struct w1_slave, dev);

2
drivers/w1/slaves/w1_ds2780.h
View file

@ -124,6 +124,8 @@
extern int w1_ds2780_io(struct device *dev, char *buf, int addr, size_t count,
int io);
extern int w1_ds2780_io_nolock(struct device *dev, char *buf, int addr,
size_t count, int io);
extern int w1_ds2780_eeprom_cmd(struct device *dev, int addr, int cmd);
#endif /* !_W1_DS2780_H */