The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.4.y git checkout FETCH_HEAD git cherry-pick -x e0e7089bf9a87bc5e3997422e4e24563424f9018 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '167930394920337@kroah.com' --subject-prefix 'PATCH 5.4.y' HEAD^..
Possible dependencies:
e0e7089bf9a8 ("interconnect: fix icc_provider_del() error handling") 680f8666baf6 ("interconnect: Make icc_provider_del() return void") 1521e22bfa12 ("interconnect: Introduce xlate_extended() callback") 8a307d3601bc ("interconnect: Export of_icc_get_from_provider()") 1597d453289b ("interconnect: Add of_icc_get_by_index() helper function") 3791163602f7 ("interconnect: Handle memory allocation errors") 05309830e1f8 ("interconnect: Add a name to struct icc_path") dd018a9cf910 ("interconnect: Move internal structs into a separate file")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From e0e7089bf9a87bc5e3997422e4e24563424f9018 Mon Sep 17 00:00:00 2001 From: Johan Hovold johan+linaro@kernel.org Date: Mon, 6 Mar 2023 08:56:30 +0100 Subject: [PATCH] interconnect: fix icc_provider_del() error handling
The interconnect framework currently expects that providers are only removed when there are no users and after all nodes have been removed.
There is currently nothing that guarantees this to be the case and the framework does not do any reference counting, but refusing to remove the provider is never correct as that would leave a dangling pointer to a resource that is about to be released in the global provider list (e.g. accessible through debugfs).
Replace the current sanity checks with WARN_ON() so that the provider is always removed.
Fixes: 11f1ceca7031 ("interconnect: Add generic on-chip interconnect API") Cc: stable@vger.kernel.org # 5.1: 680f8666baf6: interconnect: Make icc_provider_del() return void Reviewed-by: Konrad Dybcio konrad.dybcio@linaro.org Signed-off-by: Johan Hovold johan+linaro@kernel.org Tested-by: Luca Ceresoli luca.ceresoli@bootlin.com # i.MX8MP MSC SM2-MB-EP1 Board Link: https://lore.kernel.org/r/20230306075651.2449-3-johan+linaro@kernel.org Signed-off-by: Georgi Djakov djakov@kernel.org
diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c index 5217f449eeec..cabb6f5df83e 100644 --- a/drivers/interconnect/core.c +++ b/drivers/interconnect/core.c @@ -1065,18 +1065,8 @@ EXPORT_SYMBOL_GPL(icc_provider_add); void icc_provider_del(struct icc_provider *provider) { mutex_lock(&icc_lock); - if (provider->users) { - pr_warn("interconnect provider still has %d users\n", - provider->users); - mutex_unlock(&icc_lock); - return; - } - - if (!list_empty(&provider->nodes)) { - pr_warn("interconnect provider still has nodes\n"); - mutex_unlock(&icc_lock); - return; - } + WARN_ON(provider->users); + WARN_ON(!list_empty(&provider->nodes));
list_del(&provider->provider_list); mutex_unlock(&icc_lock);