Merge tag 'mailbox-v6.4' of git://git.linaro.org/landing-teams/working/fujitsu/integration

Pull mailbox updates from Jassi Brar:

 - mailbox api: allow direct registration to a channel and convert omap
   and pcc to use mbox_bind_client

 - omap and hi6220 : use of_property_read_bool

 - test: fix double-free and use spinlock header

 - rockchip and bcm-pdc: drop of_match_ptr

 - mpfs: change config symbol

 - mediatek gce: support MT6795

 - qcom apcs: consolidate of_device_id and support IPQ9574

* tag 'mailbox-v6.4' of git://git.linaro.org/landing-teams/working/fujitsu/integration:
  dt-bindings: mailbox: qcom: add compatible for IPQ9574 SoC
  mailbox: qcom-apcs-ipc: do not grow the of_device_id
  dt-bindings: mailbox: qcom,apcs-kpss-global: use fallbacks for few variants
  dt-bindings: mailbox: mediatek,gce-mailbox: Add support for MT6795
  mailbox: mpfs: convert SOC_MICROCHIP_POLARFIRE to ARCH_MICROCHIP_POLARFIRE
  mailbox: bcm-pdc: drop of_match_ptr for ID table
  mailbox: rockchip: drop of_match_ptr for ID table
  mailbox: mailbox-test: Fix potential double-free in mbox_test_message_write()
  mailbox: mailbox-test: Explicitly include header for spinlock support
  mailbox: Use of_property_read_bool() for boolean properties
  mailbox: pcc: Use mbox_bind_client
  mailbox: omap: Use mbox_bind_client
  mailbox: Allow direct registration to a channel

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/mailbox/mailbox-test.c b/drivers/mailbox/mailbox-test.c
index 4555d678fadd..c4a705c30331 100644
--- a/drivers/mailbox/mailbox-test.c
+++ b/drivers/mailbox/mailbox-test.c
@@ -12,10 +12,12 @@
 #include <linux/kernel.h>
 #include <linux/mailbox_client.h>
 #include <linux/module.h>
+#include <linux/mutex.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/poll.h>
 #include <linux/slab.h>
+#include <linux/spinlock.h>
 #include <linux/uaccess.h>
 #include <linux/sched/signal.h>
 
@@ -38,6 +40,7 @@ struct mbox_test_device {
 	char			*signal;
 	char			*message;
 	spinlock_t		lock;
+	struct mutex		mutex;
 	wait_queue_head_t	waitq;
 	struct fasync_struct	*async_queue;
 	struct dentry		*root_debugfs_dir;
@@ -110,6 +113,8 @@ static ssize_t mbox_test_message_write(struct file *filp,
 		return -EINVAL;
 	}
 
+	mutex_lock(&tdev->mutex);
+
 	tdev->message = kzalloc(MBOX_MAX_MSG_LEN, GFP_KERNEL);
 	if (!tdev->message)
 		return -ENOMEM;
@@ -144,6 +149,8 @@ out:
 	kfree(tdev->message);
 	tdev->signal = NULL;
 
+	mutex_unlock(&tdev->mutex);
+
 	return ret < 0 ? ret : count;
 }
 
@@ -392,6 +399,7 @@ static int mbox_test_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, tdev);
 
 	spin_lock_init(&tdev->lock);
+	mutex_init(&tdev->mutex);
 
 	if (tdev->rx_channel) {
 		tdev->rx_buffer = devm_kzalloc(&pdev->dev,