The patch titled
W1: don't delay search start
has been added to the -mm tree. Its filename is
w1-dont-delay-search-start.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: W1: don't delay search start
From: David Fries <david@xxxxxxxxx>
Move the creation of the w1_process thread to after the device has been
initialized. This way w1_process doesn't have to check to see if it has
been initialized and the bus search can proceed without sleeping. That
also eliminates two checks in the w1_process loop. The sleep now happens
at the end of the loop not the beginning.
Also added a comment for why the atomic_set was 2.
Signed-off-by: David Fries <david@xxxxxxxxx>
Signed-off-by: Evgeniy Polyakov <johnpol@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/w1/w1.c | 19 ++++++-------------
drivers/w1/w1_int.c | 26 +++++++++++++++++---------
2 files changed, 23 insertions(+), 22 deletions(-)
diff -puN drivers/w1/w1.c~w1-dont-delay-search-start drivers/w1/w1.c
--- a/drivers/w1/w1.c~w1-dont-delay-search-start
+++ a/drivers/w1/w1.c
@@ -813,21 +813,14 @@ int w1_process(void *data)
struct w1_master *dev = (struct w1_master *) data;
while (!kthread_should_stop() && !test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
+ if (dev->search_count) {
+ mutex_lock(&dev->mutex);
+ w1_search_process(dev, W1_SEARCH);
+ mutex_unlock(&dev->mutex);
+ }
+
try_to_freeze();
msleep_interruptible(w1_timeout * 1000);
-
- if (kthread_should_stop() || test_bit(W1_MASTER_NEED_EXIT, &dev->flags))
- break;
-
- if (!dev->initialized)
- continue;
-
- if (dev->search_count == 0)
- continue;
-
- mutex_lock(&dev->mutex);
- w1_search_process(dev, W1_SEARCH);
- mutex_unlock(&dev->mutex);
}
atomic_dec(&dev->refcnt);
diff -puN drivers/w1/w1_int.c~w1-dont-delay-search-start drivers/w1/w1_int.c
--- a/drivers/w1/w1_int.c~w1-dont-delay-search-start
+++ a/drivers/w1/w1_int.c
@@ -61,6 +61,9 @@ static struct w1_master * w1_alloc_dev(u
dev->slave_ttl = slave_ttl;
dev->search_count = -1; /* continual scan */
+ /* 1 for w1_process to decrement
+ * 1 for __w1_remove_master_device to decrement
+ */
atomic_set(&dev->refcnt, 2);
INIT_LIST_HEAD(&dev->slist);
@@ -109,23 +112,23 @@ int w1_add_master_device(struct w1_bus_m
if (!dev)
return -ENOMEM;
+ retval = w1_create_master_attributes(dev);
+ if (retval)
+ goto err_out_free_dev;
+
+ memcpy(dev->bus_master, master, sizeof(struct w1_bus_master));
+
+ dev->initialized = 1;
+
dev->thread = kthread_run(&w1_process, dev, "%s", dev->name);
if (IS_ERR(dev->thread)) {
retval = PTR_ERR(dev->thread);
dev_err(&dev->dev,
"Failed to create new kernel thread. err=%d\n",
retval);
- goto err_out_free_dev;
+ goto err_out_rm_attr;
}
- retval = w1_create_master_attributes(dev);
- if (retval)
- goto err_out_kill_thread;
-
- memcpy(dev->bus_master, master, sizeof(struct w1_bus_master));
-
- dev->initialized = 1;
-
mutex_lock(&w1_mlock);
list_add(&dev->w1_master_entry, &w1_masters);
mutex_unlock(&w1_mlock);
@@ -137,8 +140,13 @@ int w1_add_master_device(struct w1_bus_m
return 0;
+#if 0 /* Thread cleanup code, not required currently. */
err_out_kill_thread:
+ set_bit(W1_MASTER_NEED_EXIT, &dev->flags);
kthread_stop(dev->thread);
+#endif
+err_out_rm_attr:
+ w1_destroy_master_attributes(dev);
err_out_free_dev:
w1_free_dev(dev);
_
Patches currently in -mm which might be from david@xxxxxxxxx are
w1-fix-deadlocks-and-remove-w1_control_thread.patch
w1-abort-search-early-on-on-exit.patch
w1-dont-delay-search-start.patch
w1-w1_process-block-or-sleep.patch
w1-feature-enable-hardware-strong-pullup.patch
w1-feature-w1_thermc-use-strong-pullup-and-documentation.patch
w1-be-able-to-manually-add-and-remove-slaves.patch
w1-recode-w1_slave_found-logic.patch
w1-new-module-parameter-search_count.patch
w1-document-add-remove-search_count-and-pullup.patch
w1-w1_slave_read_id-read-bug-use-device_attribute.patch
w1-w1_therm-fix-user-buffer-overflow-and-cat.patch
w1-w1_family-remove-unused-variable-need_exit.patch
w1-w1_therm-consistent-mutex-access-code-cleanup.patch
w1-w1_intc-use-first-available-master-number.patch
w1-w1c-s-printk-dev_dbg.patch
w1-w1_ioc-reset-comments-and-msleep.patch
w1-ds1wmc-msleep-for-reset.patch
w1-ds2490c-correct-print-message.patch
w1-ds2490c-add-support-for-strong-pullup.patch
w1-ds2490c-ds_write_bit-grouping-error-disable-readback.patch
w1-ds2490c-disable-bit-read-and-write.patch
w1-ds2490c-simplify-and-fix-ds_touch_bit.patch
w1-ds2490c-ds_dump_status-rework.patch
w1-ds2490c-ds_reset-remove-ds_wait_status.patch
w1-ds2490c-reset-ds2490-in-init.patch
w1-ds2490c-magic-number-work.patch
w1-ds2490c-ds_write_block-remove-extra-ds_wait_status.patch
w1-documentation-w1-masters-ds2490-update.patch
w1-ds2490c-optimize-ds_set_pullup.patch
--
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