This is a note to let you know that I've just added the patch titled
wifi: ath11k: Register shutdown handler for WCN6750
to the 6.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
wifi-ath11k-register-shutdown-handler-for-wcn6750.patch
and it can be found in the queue-6.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 7edf6c127b4246b92565e9f5040ca40108d998a5
Author: Manikanta Pubbisetty <quic_mpubbise@xxxxxxxxxxx>
Date: Wed Aug 31 09:04:19 2022 +0300
wifi: ath11k: Register shutdown handler for WCN6750
[ Upstream commit ac41c2b642b136a1e633379fcb87a9db0ee07f5b ]
When the system shuts down, SMMU driver will be stopped and
will not assist in IOVA translations. SMMU driver expects all
of its consumers to shutdown before shutting down itself.
WCN6750 being one of the consumer device should not perform any
DMA operations after the SMMU has shutdown which will otherwise
result in SMMU faults.
SMMU driver will call the shutdown() callback of all its
consumer devices and the consumers shall stop further DMA
activity after the invocation of their respective shutdown()
callbacks.
Register the shutdown() callback to the platform core for WCN6750.
Change will not impact other AHB ath11k devices.
Tested-on: WCN6750 hw1.0 AHB WLAN.MSL.1.0.1-00887-QCAMSLSWPLZ-1
Signed-off-by: Manikanta Pubbisetty <quic_mpubbise@xxxxxxxxxxx>
Signed-off-by: Kalle Valo <quic_kvalo@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220720134710.15523-1-quic_mpubbise@xxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/wireless/ath/ath11k/ahb.c b/drivers/net/wireless/ath/ath11k/ahb.c
index c47414710138..911eee9646a4 100644
--- a/drivers/net/wireless/ath/ath11k/ahb.c
+++ b/drivers/net/wireless/ath/ath11k/ahb.c
@@ -1088,20 +1088,10 @@ static int ath11k_ahb_probe(struct platform_device *pdev)
return ret;
}
-static int ath11k_ahb_remove(struct platform_device *pdev)
+static void ath11k_ahb_remove_prepare(struct ath11k_base *ab)
{
- struct ath11k_base *ab = platform_get_drvdata(pdev);
unsigned long left;
- if (test_bit(ATH11K_FLAG_QMI_FAIL, &ab->dev_flags)) {
- ath11k_ahb_power_down(ab);
- ath11k_debugfs_soc_destroy(ab);
- ath11k_qmi_deinit_service(ab);
- goto qmi_fail;
- }
-
- reinit_completion(&ab->driver_recovery);
-
if (test_bit(ATH11K_FLAG_RECOVERY, &ab->dev_flags)) {
left = wait_for_completion_timeout(&ab->driver_recovery,
ATH11K_AHB_RECOVERY_TIMEOUT);
@@ -1111,19 +1101,60 @@ static int ath11k_ahb_remove(struct platform_device *pdev)
set_bit(ATH11K_FLAG_UNREGISTERING, &ab->dev_flags);
cancel_work_sync(&ab->restart_work);
+ cancel_work_sync(&ab->qmi.event_work);
+}
+
+static void ath11k_ahb_free_resources(struct ath11k_base *ab)
+{
+ struct platform_device *pdev = ab->pdev;
- ath11k_core_deinit(ab);
-qmi_fail:
ath11k_ahb_free_irq(ab);
ath11k_hal_srng_deinit(ab);
ath11k_ahb_fw_resource_deinit(ab);
ath11k_ce_free_pipes(ab);
ath11k_core_free(ab);
platform_set_drvdata(pdev, NULL);
+}
+
+static int ath11k_ahb_remove(struct platform_device *pdev)
+{
+ struct ath11k_base *ab = platform_get_drvdata(pdev);
+
+ if (test_bit(ATH11K_FLAG_QMI_FAIL, &ab->dev_flags)) {
+ ath11k_ahb_power_down(ab);
+ ath11k_debugfs_soc_destroy(ab);
+ ath11k_qmi_deinit_service(ab);
+ goto qmi_fail;
+ }
+
+ ath11k_ahb_remove_prepare(ab);
+ ath11k_core_deinit(ab);
+
+qmi_fail:
+ ath11k_ahb_free_resources(ab);
return 0;
}
+static void ath11k_ahb_shutdown(struct platform_device *pdev)
+{
+ struct ath11k_base *ab = platform_get_drvdata(pdev);
+
+ /* platform shutdown() & remove() are mutually exclusive.
+ * remove() is invoked during rmmod & shutdown() during
+ * system reboot/shutdown.
+ */
+ ath11k_ahb_remove_prepare(ab);
+
+ if (!(test_bit(ATH11K_FLAG_REGISTERED, &ab->dev_flags)))
+ goto free_resources;
+
+ ath11k_core_deinit(ab);
+
+free_resources:
+ ath11k_ahb_free_resources(ab);
+}
+
static struct platform_driver ath11k_ahb_driver = {
.driver = {
.name = "ath11k",
@@ -1131,6 +1162,7 @@ static struct platform_driver ath11k_ahb_driver = {
},
.probe = ath11k_ahb_probe,
.remove = ath11k_ahb_remove,
+ .shutdown = ath11k_ahb_shutdown,
};
static int ath11k_ahb_init(void)
diff --git a/drivers/net/wireless/ath/ath11k/core.c b/drivers/net/wireless/ath/ath11k/core.c
index c3e9e4f7bc24..9df6aaae8a44 100644
--- a/drivers/net/wireless/ath/ath11k/core.c
+++ b/drivers/net/wireless/ath/ath11k/core.c
@@ -1563,6 +1563,8 @@ static void ath11k_core_pre_reconfigure_recovery(struct ath11k_base *ab)
wake_up(&ab->wmi_ab.tx_credits_wq);
wake_up(&ab->peer_mapping_wq);
+
+ reinit_completion(&ab->driver_recovery);
}
static void ath11k_core_post_reconfigure_recovery(struct ath11k_base *ab)
