6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Bjorn Andersson quic_bjorande@quicinc.com
[ Upstream commit 9329933699b32d467a99befa20415c4b2172389a ]
The recently introduced commit '635ce0db8956 ("soc: qcom: pmic_glink: don't traverse clients list without a lock")' ensured that the clients list is not modified while traversed.
But the callback is made from the GLINK IRQ handler and as such this mutual exclusion can not be provided by a (sleepable) mutex.
Replace the mutex with a spinlock.
Fixes: 635ce0db8956 ("soc: qcom: pmic_glink: don't traverse clients list without a lock") Signed-off-by: Bjorn Andersson quic_bjorande@quicinc.com Reviewed-by: Dmitry Baryshkov dmitry.baryshkov@linaro.org Link: https://lore.kernel.org/r/20240430-pmic-glink-sleep-while-atomic-v1-1-88fb49... Signed-off-by: Bjorn Andersson andersson@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/soc/qcom/pmic_glink.c | 25 +++++++++++++++---------- 1 file changed, 15 insertions(+), 10 deletions(-)
diff --git a/drivers/soc/qcom/pmic_glink.c b/drivers/soc/qcom/pmic_glink.c index 062ff7b12de6a..61a359938b6c4 100644 --- a/drivers/soc/qcom/pmic_glink.c +++ b/drivers/soc/qcom/pmic_glink.c @@ -11,6 +11,7 @@ #include <linux/slab.h> #include <linux/soc/qcom/pdr.h> #include <linux/soc/qcom/pmic_glink.h> +#include <linux/spinlock.h>
enum { PMIC_GLINK_CLIENT_BATT = 0, @@ -39,7 +40,7 @@ struct pmic_glink { unsigned int pdr_state;
/* serializing clients list updates */ - struct mutex client_lock; + spinlock_t client_lock; struct list_head clients; };
@@ -61,10 +62,11 @@ static void _devm_pmic_glink_release_client(struct device *dev, void *res) { struct pmic_glink_client *client = (struct pmic_glink_client *)res; struct pmic_glink *pg = client->pg; + unsigned long flags;
- mutex_lock(&pg->client_lock); + spin_lock_irqsave(&pg->client_lock, flags); list_del(&client->node); - mutex_unlock(&pg->client_lock); + spin_unlock_irqrestore(&pg->client_lock, flags); }
struct pmic_glink_client *devm_pmic_glink_register_client(struct device *dev, @@ -75,6 +77,7 @@ struct pmic_glink_client *devm_pmic_glink_register_client(struct device *dev, { struct pmic_glink_client *client; struct pmic_glink *pg = dev_get_drvdata(dev->parent); + unsigned long flags;
client = devres_alloc(_devm_pmic_glink_release_client, sizeof(*client), GFP_KERNEL); if (!client) @@ -87,12 +90,12 @@ struct pmic_glink_client *devm_pmic_glink_register_client(struct device *dev, client->priv = priv;
mutex_lock(&pg->state_lock); - mutex_lock(&pg->client_lock); + spin_lock_irqsave(&pg->client_lock, flags);
list_add(&client->node, &pg->clients); client->pdr_notify(client->priv, pg->client_state);
- mutex_unlock(&pg->client_lock); + spin_unlock_irqrestore(&pg->client_lock, flags); mutex_unlock(&pg->state_lock);
devres_add(dev, client); @@ -115,6 +118,7 @@ static int pmic_glink_rpmsg_callback(struct rpmsg_device *rpdev, void *data, struct pmic_glink_client *client; struct pmic_glink_hdr *hdr; struct pmic_glink *pg = dev_get_drvdata(&rpdev->dev); + unsigned long flags;
if (len < sizeof(*hdr)) { dev_warn(pg->dev, "ignoring truncated message\n"); @@ -123,12 +127,12 @@ static int pmic_glink_rpmsg_callback(struct rpmsg_device *rpdev, void *data,
hdr = data;
- mutex_lock(&pg->client_lock); + spin_lock_irqsave(&pg->client_lock, flags); list_for_each_entry(client, &pg->clients, node) { if (client->id == le32_to_cpu(hdr->owner)) client->cb(data, len, client->priv); } - mutex_unlock(&pg->client_lock); + spin_unlock_irqrestore(&pg->client_lock, flags);
return 0; } @@ -168,6 +172,7 @@ static void pmic_glink_state_notify_clients(struct pmic_glink *pg) { struct pmic_glink_client *client; unsigned int new_state = pg->client_state; + unsigned long flags;
if (pg->client_state != SERVREG_SERVICE_STATE_UP) { if (pg->pdr_state == SERVREG_SERVICE_STATE_UP && pg->ept) @@ -178,10 +183,10 @@ static void pmic_glink_state_notify_clients(struct pmic_glink *pg) }
if (new_state != pg->client_state) { - mutex_lock(&pg->client_lock); + spin_lock_irqsave(&pg->client_lock, flags); list_for_each_entry(client, &pg->clients, node) client->pdr_notify(client->priv, new_state); - mutex_unlock(&pg->client_lock); + spin_unlock_irqrestore(&pg->client_lock, flags); pg->client_state = new_state; } } @@ -268,7 +273,7 @@ static int pmic_glink_probe(struct platform_device *pdev) pg->dev = &pdev->dev;
INIT_LIST_HEAD(&pg->clients); - mutex_init(&pg->client_lock); + spin_lock_init(&pg->client_lock); mutex_init(&pg->state_lock);
match_data = (unsigned long *)of_device_get_match_data(&pdev->dev);