From: Hans Verkuil <hverkuil-cisco@xs4all.nl> stable inclusion from stable-v6.6.33 commit 1af4790bc117579402ffa709794cebb487581016 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IAD6H2 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- [ Upstream commit 47c82aac10a6954d68f29f10d9758d016e8e5af1 ] 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@P... Fixes: ca684386e6e2 ("[media] cec: add HDMI CEC framework (api)") Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Wang Hai <wanghai38@huawei.com> --- drivers/media/cec/core/cec-adap.c | 6 +++++- drivers/media/cec/core/cec-api.c | 2 +- include/media/cec.h | 1 + 3 files changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/media/cec/core/cec-adap.c b/drivers/media/cec/core/cec-adap.c index 99c14942f281..c15abee3e9bc 100644 --- a/drivers/media/cec/core/cec-adap.c +++ b/drivers/media/cec/core/cec-adap.c @@ -1547,9 +1547,12 @@ static int cec_config_thread_func(void *arg) */ 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 */ @@ -1564,6 +1567,7 @@ 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); diff --git a/include/media/cec.h b/include/media/cec.h index 9c007f83569a..ffd17371302c 100644 --- a/include/media/cec.h +++ b/include/media/cec.h @@ -247,6 +247,7 @@ struct cec_adapter { u16 phys_addr; bool needs_hpd; bool is_enabled; + bool is_claiming_log_addrs; bool is_configuring; bool must_reconfigure; bool is_configured; -- 2.17.1