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serdev: use zero to indicate infinite write timeout 

Use zero to indicate infinite timeout for the synchronous
serdev_device_write() helper.

This allows drivers to specify an infinite timeout without knowing about
serdev implementation details, while also allowing the same timeout
argument to be used for both serdev_device_write() and
serdev_device_wait_until_sent().

Note that passing zero to the current helper makes no sense; just call
the asynchronous serdev_device_write_buf() directly instead.

Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2018-11-14 16:09:01 +01:00 committed by Greg Kroah-Hartman
parent dc93967b80
commit 22d66c85fd
1 changed files with 5 additions and 2 deletions
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7
drivers/tty/serdev/core.c
View File

@ -15,6 +15,7 @@
#include <linux/of_device.h>
#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>
#include <linux/sched.h>
#include <linux/serdev.h>
#include <linux/slab.h>
@ -235,10 +236,12 @@ int serdev_device_write(struct serdev_device *serdev,
struct serdev_controller *ctrl = serdev->ctrl;
int ret;
if (!ctrl || !ctrl->ops->write_buf ||
(timeout && !serdev->ops->write_wakeup))
if (!ctrl || !ctrl->ops->write_buf || !serdev->ops->write_wakeup)
return -EINVAL;
if (timeout == 0)
timeout = MAX_SCHEDULE_TIMEOUT;
mutex_lock(&serdev->write_lock);
do {
reinit_completion(&serdev->write_comp);