The patch titled
w1: w1_process, block or sleep
has been added to the -mm tree. Its filename is
w1-w1_process-block-or-sleep.patch
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The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: w1: w1_process, block or sleep
From: David Fries <david@xxxxxxxxx>
The w1_process thread's sleeping and termination has been modified.
msleep_interruptible was replaced by schedule_timeout and schedule to
allow for kthread_stop and wake_up_process to interrupt the sleep and the
unbounded sleeping when a bus search is disabled. The W1_MASTER_NEED_EXIT
and flags variable were removed as they were redundant with
kthread_should_stop and kthread_stop. If w1_process is sleeping,
requesting a search will immediately wake it up rather than waiting for
the end of msleep_interruptible previously.
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 | 20 +++++++++++++++++---
drivers/w1/w1.h | 4 ----
drivers/w1/w1_int.c | 2 --
3 files changed, 17 insertions(+), 9 deletions(-)
diff -puN drivers/w1/w1.c~w1-w1_process-block-or-sleep drivers/w1/w1.c
--- a/drivers/w1/w1.c~w1-w1_process-block-or-sleep
+++ a/drivers/w1/w1.c
@@ -251,6 +251,7 @@ static ssize_t w1_master_attribute_store
mutex_lock(&md->mutex);
md->search_count = simple_strtol(buf, NULL, 0);
mutex_unlock(&md->mutex);
+ wake_up_process(md->thread);
return count;
}
@@ -773,7 +774,7 @@ void w1_search(struct w1_master *dev, u8
tmp64 = (triplet_ret >> 2);
rn |= (tmp64 << i);
- if (test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
+ if (kthread_should_stop()) {
printk(KERN_INFO "Abort w1_search (exiting)\n");
return;
}
@@ -811,8 +812,12 @@ void w1_search_process(struct w1_master
int w1_process(void *data)
{
struct w1_master *dev = (struct w1_master *) data;
+ /* As long as w1_timeout is only set by a module parameter the sleep
+ * time can be calculated in jiffies once.
+ */
+ const unsigned long jtime = msecs_to_jiffies(w1_timeout * 1000);
- while (!kthread_should_stop() && !test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) {
+ while (!kthread_should_stop()) {
if (dev->search_count) {
mutex_lock(&dev->mutex);
w1_search_process(dev, W1_SEARCH);
@@ -820,7 +825,16 @@ int w1_process(void *data)
}
try_to_freeze();
- msleep_interruptible(w1_timeout * 1000);
+ __set_current_state(TASK_INTERRUPTIBLE);
+
+ if (kthread_should_stop())
+ break;
+
+ /* Only sleep when the search is active. */
+ if (dev->search_count)
+ schedule_timeout(jtime);
+ else
+ schedule();
}
atomic_dec(&dev->refcnt);
diff -puN drivers/w1/w1.h~w1-w1_process-block-or-sleep drivers/w1/w1.h
--- a/drivers/w1/w1.h~w1-w1_process-block-or-sleep
+++ a/drivers/w1/w1.h
@@ -149,8 +149,6 @@ struct w1_bus_master
u8, w1_slave_found_callback);
};
-#define W1_MASTER_NEED_EXIT 0
-
struct w1_master
{
struct list_head w1_master_entry;
@@ -169,8 +167,6 @@ struct w1_master
void *priv;
int priv_size;
- long flags;
-
struct task_struct *thread;
struct mutex mutex;
diff -puN drivers/w1/w1_int.c~w1-w1_process-block-or-sleep drivers/w1/w1_int.c
--- a/drivers/w1/w1_int.c~w1-w1_process-block-or-sleep
+++ a/drivers/w1/w1_int.c
@@ -142,7 +142,6 @@ int w1_add_master_device(struct w1_bus_m
#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:
@@ -158,7 +157,6 @@ void __w1_remove_master_device(struct w1
struct w1_netlink_msg msg;
struct w1_slave *sl, *sln;
- set_bit(W1_MASTER_NEED_EXIT, &dev->flags);
kthread_stop(dev->thread);
mutex_lock(&w1_mlock);
_
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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