diff options
| author | Hans Verkuil <hverkuil-cisco@xs4all.nl> | 2024-02-22 17:17:33 +0100 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@kernel.org> | 2024-05-02 19:59:59 +0200 |
| commit | 47c82aac10a6954d68f29f10d9758d016e8e5af1 (patch) | |
| tree | c9fd84094894316e2694787f18641c2f69a680df /drivers/media/cec | |
| parent | media: cec: cec-api: add locking in cec_release() (diff) | |
| download | linux-47c82aac10a6954d68f29f10d9758d016e8e5af1.tar.xz linux-47c82aac10a6954d68f29f10d9758d016e8e5af1.zip | |
media: cec: core: avoid recursive cec_claim_log_addrs
Keep track if cec_claim_log_addrs() is running, and return -EBUSY
if it is when calling CEC_ADAP_S_LOG_ADDRS.
This prevents a case where cec_claim_log_addrs() could be called
while it was still in progress.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reported-by: Yang, Chenyuan <cy54@illinois.edu>
Closes: https://lore.kernel.org/linux-media/PH7PR11MB57688E64ADE4FE82E658D86DA09EA@PH7PR11MB5768.namprd11.prod.outlook.com/
Fixes: ca684386e6e2 ("[media] cec: add HDMI CEC framework (api)")
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Diffstat (limited to 'drivers/media/cec')
| -rw-r--r-- | drivers/media/cec/core/cec-adap.c | 6 | ||||
| -rw-r--r-- | drivers/media/cec/core/cec-api.c | 2 |
2 files changed, 6 insertions, 2 deletions
diff --git a/drivers/media/cec/core/cec-adap.c b/drivers/media/cec/core/cec-adap.c index 6fc7de744ee9..a493cbce2456 100644 --- a/drivers/media/cec/core/cec-adap.c +++ b/drivers/media/cec/core/cec-adap.c @@ -1574,9 +1574,12 @@ unconfigure: */ static void cec_claim_log_addrs(struct cec_adapter *adap, bool block) { - if (WARN_ON(adap->is_configuring || adap->is_configured)) + if (WARN_ON(adap->is_claiming_log_addrs || + adap->is_configuring || adap->is_configured)) return; + adap->is_claiming_log_addrs = true; + init_completion(&adap->config_completion); /* Ready to kick off the thread */ @@ -1591,6 +1594,7 @@ static void cec_claim_log_addrs(struct cec_adapter *adap, bool block) wait_for_completion(&adap->config_completion); mutex_lock(&adap->lock); } + adap->is_claiming_log_addrs = false; } /* diff --git a/drivers/media/cec/core/cec-api.c b/drivers/media/cec/core/cec-api.c index d64bb716f9c6..3ef915344304 100644 --- a/drivers/media/cec/core/cec-api.c +++ b/drivers/media/cec/core/cec-api.c @@ -178,7 +178,7 @@ static long cec_adap_s_log_addrs(struct cec_adapter *adap, struct cec_fh *fh, CEC_LOG_ADDRS_FL_ALLOW_RC_PASSTHRU | CEC_LOG_ADDRS_FL_CDC_ONLY; mutex_lock(&adap->lock); - if (!adap->is_configuring && + if (!adap->is_claiming_log_addrs && !adap->is_configuring && (!log_addrs.num_log_addrs || !adap->is_configured) && !cec_is_busy(adap, fh)) { err = __cec_s_log_addrs(adap, &log_addrs, block); |