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stm class: Plug stm device's unlink callback

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STM device's unlink callback is never actually called from anywhere in
the stm class code.

This patch adds calls to stm driver's unlink method after the unlinking
has succeeded.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Shishkin 2016-02-15 19:12:09 +02:00 committed by Greg Kroah-Hartman
parent b4ca34aaf7
commit cc8424074e
2 changed files with 22 additions and 4 deletions
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21
drivers/hwtracing/stm/core.c
View file

@ -376,14 +376,19 @@ static int stm_char_open(struct inode *inode, struct file *file)
static int stm_char_release(struct inode *inode, struct file *file)
{
struct stm_file *stmf = file->private_data;
struct stm_device *stm = stmf->stm;
stm_output_free(stmf->stm, &stmf->output);
if (stm->data->unlink)
stm->data->unlink(stm->data, stmf->output.master,
stmf->output.channel);
stm_output_free(stm, &stmf->output);
/*
* matches the stm_char_open()'s
* class_find_device() + try_module_get()
*/
stm_put_device(stmf->stm);
stm_put_device(stm);
kfree(stmf);
return 0;
@ -865,9 +870,19 @@ static int __stm_source_link_drop(struct stm_source_device *src,
spin_unlock(&src->link_lock);
spin_unlock(&stm->link_lock);
if (!ret && src->data->unlink)
/*
* Call the unlink callbacks for both source and stm, when we know
* that we have actually performed the unlinking.
*/
if (!ret) {
if (src->data->unlink)
src->data->unlink(src->data);
if (stm->data->unlink)
stm->data->unlink(stm->data, src->output.master,
src->output.channel);
}
return ret;
}

3
include/linux/stm.h
View file

@ -74,6 +74,9 @@ struct stm_device;
* it must return zero;
* 3) if it does not support the requested packet type/flag combination,
* it must return -ENOTSUPP.
*
* The @unlink callback is called when there are no more active writers so
* that the master/channel can be quiesced.
*/
struct stm_data {
const char *name;