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greybus: loopback: add poll support to the iteration_count sysfs file

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This adds the ability to poll on "iteration_count" in sysfs and be woken
up when it changes, saving some cycles constantly hammering on the file
waiting for it to change.

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Tested-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
This commit is contained in:
Greg Kroah-Hartman 2015-07-22 11:09:23 -07:00
parent 701615f82f
commit c2939f41bc
1 changed files with 2 additions and 1 deletions
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3
drivers/staging/greybus/loopback.c
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@ -141,7 +141,6 @@ gb_loopback_stats_attrs(throughput);
gb_loopback_ro_attr(error, d);
/* The current index of the for (i = 0; i < iteration_max; i++) loop */
gb_loopback_ro_attr(iteration_count, u);
/* TODO iteration_count might be better with the KOBJ_CHANGE event */
/*
* Type of loopback message to send based on protocol type definitions
@ -406,6 +405,8 @@ static int gb_loopback_fn(void *data)
if (gb->iteration_max) {
if (gb->iteration_count < gb->iteration_max) {
gb->iteration_count++;
sysfs_notify(&gb->connection->dev.kobj, NULL,
"iteration_count");
} else {
gb->type = 0;
continue;