diff options
author | 2017-03-08 23:13:28 -0800 | |
---|---|---|
committer | 2017-03-08 23:36:15 -0800 | |
commit | 52f993b8e89487ec9ee15a7fb4979e0f09a45b27 (patch) | |
tree | d65304486afe0bea4a311c783c0d72791c8c0aa2 /kernel/drivers/iio/industrialio-buffer.c | |
parent | c189ccac5702322ed843fe17057035b7222a59b6 (diff) |
Upgrade to 4.4.50-rt62
The current kernel is based on rt kernel v4.4.6-rt14. We will upgrade it
to 4.4.50-rt62.
The command to achieve it is:
a) Clone a git repo from
git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-stable-rt.git
b) Get the diff between this two changesets:
git diff 640eca2901f3435e616157b11379d3223a44b391
705619beeea1b0b48219a683fd1a901a86fdaf5e
where the two commits are:
[yjiang5@jnakajim-build linux-stable-rt]$ git show --oneline --name-only
640eca2901f3435e616157b11379d3223a44b391
640eca2901f3 v4.4.6-rt14
localversion-rt
[yjiang5@jnakajim-build linux-stable-rt]$ git show --oneline --name-only
705619beeea1b0b48219a683fd1a901a86fdaf5e
705619beeea1 Linux 4.4.50-rt62
localversion-rt
c) One patch has been backported thus revert the patch before applying.
filterdiff -p1 -x scripts/package/Makefile
~/tmp/v4.4.6-rt14-4.4.50-rt62.diff |patch -p1 --dry-run
Upstream status: backport
Change-Id: I244d57a32f6066e5a5b9915f9fbf99e7bbca6e01
Signed-off-by: Yunhong Jiang <yunhong.jiang@linux.intel.com>
Diffstat (limited to 'kernel/drivers/iio/industrialio-buffer.c')
-rw-r--r-- | kernel/drivers/iio/industrialio-buffer.c | 27 |
1 files changed, 19 insertions, 8 deletions
diff --git a/kernel/drivers/iio/industrialio-buffer.c b/kernel/drivers/iio/industrialio-buffer.c index 0f6f63b20..32bb03606 100644 --- a/kernel/drivers/iio/industrialio-buffer.c +++ b/kernel/drivers/iio/industrialio-buffer.c @@ -107,9 +107,10 @@ ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf, { struct iio_dev *indio_dev = filp->private_data; struct iio_buffer *rb = indio_dev->buffer; + DEFINE_WAIT_FUNC(wait, woken_wake_function); size_t datum_size; size_t to_wait; - int ret; + int ret = 0; if (!indio_dev->info) return -ENODEV; @@ -131,19 +132,29 @@ ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf, else to_wait = min_t(size_t, n / datum_size, rb->watermark); + add_wait_queue(&rb->pollq, &wait); do { - ret = wait_event_interruptible(rb->pollq, - iio_buffer_ready(indio_dev, rb, to_wait, n / datum_size)); - if (ret) - return ret; + if (!indio_dev->info) { + ret = -ENODEV; + break; + } - if (!indio_dev->info) - return -ENODEV; + if (!iio_buffer_ready(indio_dev, rb, to_wait, n / datum_size)) { + if (signal_pending(current)) { + ret = -ERESTARTSYS; + break; + } + + wait_woken(&wait, TASK_INTERRUPTIBLE, + MAX_SCHEDULE_TIMEOUT); + continue; + } ret = rb->access->read_first_n(rb, n, buf); if (ret == 0 && (filp->f_flags & O_NONBLOCK)) ret = -EAGAIN; - } while (ret == 0); + } while (ret == 0); + remove_wait_queue(&rb->pollq, &wait); return ret; } |