From: Clifton Barnes <cabarnes@indesign-llc.com>
To: <akpm@linux-foundation.org>
Cc: <ryan@bluewatersys.com>, <haojian.zhuang@marvell.com>,
<johnpol@2ka.mipt.ru>, <simon.inizan@goobie.fr>,
<linux-kernel@vger.kernel.org>
Subject: [PATCH v2 2/3] w1: ds2780, add a nolock function to w1 interface
Date: Wed, 24 Aug 2011 10:35:30 -0400 [thread overview]
Message-ID: <4E550C32.4010802@indesign-llc.com> (raw)
Adds a nolock function to the w1 interface to avoid locking the
mutex if needed.
Signed-off-by: Clifton Barnes <cabarnes@indesign-llc.com>
---
drivers/w1/slaves/w1_ds2780.c | 48 +++++++++++++++++++++++++++++-----------
drivers/w1/slaves/w1_ds2780.h | 2 +
2 files changed, 37 insertions(+), 13 deletions(-)
diff --git a/drivers/w1/slaves/w1_ds2780.c b/drivers/w1/slaves/w1_ds2780.c
index 274c8f3..505b17d 100644
--- a/drivers/w1/slaves/w1_ds2780.c
+++ b/drivers/w1/slaves/w1_ds2780.c
@@ -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:
+ 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 count;
+ 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);
diff --git a/drivers/w1/slaves/w1_ds2780.h b/drivers/w1/slaves/w1_ds2780.h
index a1fba79..7373793 100644
--- a/drivers/w1/slaves/w1_ds2780.h
+++ b/drivers/w1/slaves/w1_ds2780.h
@@ -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 */
--
1.7.6
reply other threads:[~2011-08-24 14:35 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4E550C32.4010802@indesign-llc.com \
--to=cabarnes@indesign-llc.com \
--cc=akpm@linux-foundation.org \
--cc=haojian.zhuang@marvell.com \
--cc=johnpol@2ka.mipt.ru \
--cc=linux-kernel@vger.kernel.org \
--cc=ryan@bluewatersys.com \
--cc=simon.inizan@goobie.fr \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.