On Fri Jul 10 13:07:36 2026 +0200, Hans Verkuil wrote:
> 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 <[email protected]>
> Signed-off-by: Mauro Carvalho Chehab <[email protected]>
Patch committed.
Thanks,
Mauro Carvalho Chehab
drivers/media/cec/core/cec-adap.c | 7 +++++++
drivers/media/cec/core/cec-core.c | 31 +++++++++++++++++++++++++++++++
include/media/cec.h | 4 ++++
3 files changed, 42 insertions(+)
---
diff --git a/drivers/media/cec/core/cec-adap.c
b/drivers/media/cec/core/cec-adap.c
index 774bf9099183..ee8a200b9803 100644
--- a/drivers/media/cec/core/cec-adap.c
+++ b/drivers/media/cec/core/cec-adap.c
@@ -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) {
/*
diff --git a/drivers/media/cec/core/cec-core.c
b/drivers/media/cec/core/cec-core.c
index c51e769b4e34..230f8a413e74 100644
--- a/drivers/media/cec/core/cec-core.c
+++ b/drivers/media/cec/core/cec-core.c
@@ -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,
diff --git a/include/media/cec.h b/include/media/cec.h
index 5aff399e69e6..4c8b0950b377 100644
--- a/include/media/cec.h
+++ b/include/media/cec.h
@@ -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
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