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media: cec/core: add error-inj-tx-timeouts debugfs entry

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Add a new debugfs entry that makes it possible to do
error injection of failing the next N transmits by a
timeout.

This can be used to test what happens in that case during
the claiming of a free logical address.

Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Hans Verkuil 2026-07-10 13:07:36 +02:00 committed by Mauro Carvalho Chehab
parent cefce07c6c
commit 22c0f8e2d9
3 changed files with 42 additions and 0 deletions
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7
drivers/media/cec/core/cec-adap.c
View File

@ -629,6 +629,13 @@ void cec_transmit_done_ts(struct cec_adapter *adap, u8 status,
attempts_made = 1;
mutex_lock(&adap->lock);
if (adap->error_inj_tx_timeouts) {
dprintk(2, "%s: error_inj_tx_timeouts %u\n",
__func__, adap->error_inj_tx_timeouts);
adap->error_inj_tx_timeouts--;
mutex_unlock(&adap->lock);
return;
}
data = adap->transmitting;
if (!data) {
/*

31
drivers/media/cec/core/cec-core.c
View File

@ -223,6 +223,34 @@ static int cec_error_inj_show(struct seq_file *sf, void *unused)
return call_op(adap, error_inj_show, sf);
}
DEFINE_SHOW_STORE_ATTRIBUTE(cec_error_inj);
static ssize_t cec_error_inj_tx_timeouts_write(struct file *file,
const char __user *ubuf, size_t count, loff_t *ppos)
{
struct seq_file *sf = file->private_data;
struct cec_adapter *adap = sf->private;
int ret;
if (count > 5)
return -EINVAL;
mutex_lock(&adap->lock);
ret = kstrtou32_from_user(ubuf, count, 0, &adap->error_inj_tx_timeouts);
if (ret)
adap->error_inj_tx_timeouts = 0;
mutex_unlock(&adap->lock);
return ret ? : count;
}
static int cec_error_inj_tx_timeouts_show(struct seq_file *sf, void *unused)
{
struct cec_adapter *adap = sf->private;
seq_printf(sf, "%u", adap->error_inj_tx_timeouts);
return 0;
}
DEFINE_SHOW_STORE_ATTRIBUTE(cec_error_inj_tx_timeouts);
#endif
struct cec_adapter *cec_allocate_adapter(const struct cec_adap_ops *ops,
@ -367,6 +395,9 @@ int cec_register_adapter(struct cec_adapter *adap,
debugfs_create_devm_seqfile(&adap->devnode.dev, "status", adap->cec_dir,
cec_adap_status);
debugfs_create_file("error-inj-tx-timeouts", 0644, adap->cec_dir, adap,
&cec_error_inj_tx_timeouts_fops);
if (!adap->ops->error_inj_show || !adap->ops->error_inj_parse_line)
return 0;
debugfs_create_file("error-inj", 0644, adap->cec_dir, adap,

4
include/media/cec.h
View File

@ -221,6 +221,8 @@ struct cec_adap_ops {
* @tx_error_log_cnt: number of logged Error transmits since the adapter was
* enabled. Used to avoid flooding the kernel log if this
* happens a lot.
* @error_inj_tx_timeouts: error injection: the next @error_inj_tx_timeouts
* transmits will time out.
* @notifier: CEC notifier
* @pin: CEC pin status struct
* @cec_dir: debugfs cec directory
@ -281,6 +283,8 @@ struct cec_adapter {
u32 tx_low_drive_log_cnt;
u32 tx_error_log_cnt;
u32 error_inj_tx_timeouts;
#ifdef CONFIG_CEC_NOTIFIER
struct cec_notifier *notifier;
#endif