From: Pranjal Ramajor Asha Kanojiya <quic_pkano...@quicinc.com>
Offload the balancing of init and destroy calls to DRM managed APIs.
mutex destroy for ->cntl_mutex is not called during device release and
destroy workqueue is not called in error path of create_qdev(). So, use
DRM managed APIs to manage the release of resources and avoid such
problems.
Signed-off-by: Pranjal Ramajor Asha Kanojiya <quic_pkano...@quicinc.com>
Reviewed-by: Jeffrey Hugo <quic_jh...@quicinc.com>
Signed-off-by: Jeffrey Hugo <quic_jh...@quicinc.com>
---
drivers/accel/qaic/qaic.h | 1 +
drivers/accel/qaic/qaic_drv.c | 138 ++++++++++++++++++++++------------
2 files changed, 89 insertions(+), 50 deletions(-)
diff --git a/drivers/accel/qaic/qaic.h b/drivers/accel/qaic/qaic.h
index 2b3ef588b717..9256653b3036 100644
--- a/drivers/accel/qaic/qaic.h
+++ b/drivers/accel/qaic/qaic.h
@@ -30,6 +30,7 @@
#define to_qaic_drm_device(dev) container_of(dev, struct qaic_drm_device, drm)
#define to_drm(qddev) (&(qddev)->drm)
#define to_accel_kdev(qddev) (to_drm(qddev)->accel->kdev) /* Return Linux
device of accel node */
+#define to_qaic_device(dev) (to_qaic_drm_device((dev))->qdev)
enum __packed dev_states {
/* Device is offline or will be very soon */
diff --git a/drivers/accel/qaic/qaic_drv.c b/drivers/accel/qaic/qaic_drv.c
index 2a313eb69b12..10a43d02844f 100644
--- a/drivers/accel/qaic/qaic_drv.c
+++ b/drivers/accel/qaic/qaic_drv.c
@@ -44,6 +44,53 @@ MODULE_PARM_DESC(datapath_polling, "Operate the datapath in
polling mode");
static bool link_up;
static DEFINE_IDA(qaic_usrs);
+static void qaicm_wq_release(struct drm_device *dev, void *res)
+{
+ struct workqueue_struct *wq = res;
+
+ destroy_workqueue(wq);
+}
+
+static struct workqueue_struct *qaicm_wq_init(struct drm_device *dev, const
char *fmt)
+{
+ struct workqueue_struct *wq;
+ int ret;
+
+ wq = alloc_workqueue(fmt, WQ_UNBOUND, 0);
+ if (!wq)
+ return ERR_PTR(-ENOMEM);
+ ret = drmm_add_action_or_reset(dev, qaicm_wq_release, wq);
+ if (ret)
+ return ERR_PTR(ret);
+
+ return wq;
+}
+
+static void qaicm_srcu_release(struct drm_device *dev, void *res)
+{
+ struct srcu_struct *lock = res;
+
+ cleanup_srcu_struct(lock);
+}
+
+static int qaicm_srcu_init(struct drm_device *dev, struct srcu_struct *lock)
+{
+ int ret;
+
+ ret = init_srcu_struct(lock);
+ if (ret)
+ return ret;
+
+ return drmm_add_action_or_reset(dev, qaicm_srcu_release, lock);
+}
+
+static void qaicm_pci_release(struct drm_device *dev, void *res)
+{
+ struct qaic_device *qdev = to_qaic_device(dev);
+
+ pci_set_drvdata(qdev->pdev, NULL);
+}
+
static void free_usr(struct kref *kref)
{
struct qaic_user *usr = container_of(kref, struct qaic_user, ref_count);
@@ -299,74 +346,73 @@ void qaic_dev_reset_clean_local_state(struct qaic_device
*qdev)
release_dbc(qdev, i);
}
-static void cleanup_qdev(struct qaic_device *qdev)
-{
- int i;
-
- for (i = 0; i < qdev->num_dbc; ++i)
- cleanup_srcu_struct(&qdev->dbc[i].ch_lock);
- cleanup_srcu_struct(&qdev->dev_lock);
- pci_set_drvdata(qdev->pdev, NULL);
- destroy_workqueue(qdev->cntl_wq);
- destroy_workqueue(qdev->qts_wq);
-}
-
static struct qaic_device *create_qdev(struct pci_dev *pdev, const struct
pci_device_id *id)
{
+ struct device *dev = &pdev->dev;
struct qaic_drm_device *qddev;
struct qaic_device *qdev;
- int i;
+ struct drm_device *drm;
+ int i, ret;
- qdev = devm_kzalloc(&pdev->dev, sizeof(*qdev), GFP_KERNEL);
+ qdev = devm_kzalloc(dev, sizeof(*qdev), GFP_KERNEL);
if (!qdev)
return NULL;
qdev->dev_state = QAIC_OFFLINE;
if (id->device == PCI_DEV_AIC100) {
qdev->num_dbc = 16;
- qdev->dbc = devm_kcalloc(&pdev->dev, qdev->num_dbc,
sizeof(*qdev->dbc), GFP_KERNEL);
+ qdev->dbc = devm_kcalloc(dev, qdev->num_dbc,
sizeof(*qdev->dbc), GFP_KERNEL);
if (!qdev->dbc)
return NULL;
}
- qdev->cntl_wq = alloc_workqueue("qaic_cntl", WQ_UNBOUND, 0);
- if (!qdev->cntl_wq)
+ qddev = devm_drm_dev_alloc(&pdev->dev, &qaic_accel_driver, struct
qaic_drm_device, drm);
+ if (IS_ERR(qddev))
+ return NULL;
+
+ drm = to_drm(qddev);
+ pci_set_drvdata(pdev, qdev);
+
+ ret = drmm_mutex_init(drm, &qddev->users_mutex);
+ if (ret)
+ return NULL;
+ ret = drmm_add_action_or_reset(drm, qaicm_pci_release, NULL);
+ if (ret)
+ return NULL;
+ ret = drmm_mutex_init(drm, &qdev->cntl_mutex);
+ if (ret)
return NULL;
- qdev->qts_wq = alloc_workqueue("qaic_ts", WQ_UNBOUND, 0);
- if (!qdev->qts_wq) {
- destroy_workqueue(qdev->cntl_wq);
+ qdev->cntl_wq = qaicm_wq_init(drm, "qaic_cntl");
+ if (IS_ERR(qdev->cntl_wq))
+ return NULL;
+ qdev->qts_wq = qaicm_wq_init(drm, "qaic_ts");
+ if (IS_ERR(qdev->qts_wq))
return NULL;
- }
- pci_set_drvdata(pdev, qdev);
+ ret = qaicm_srcu_init(drm, &qdev->dev_lock);
+ if (ret)
+ return NULL;
+
+ qdev->qddev = qddev;
qdev->pdev = pdev;
+ qddev->qdev = qdev;
- mutex_init(&qdev->cntl_mutex);
INIT_LIST_HEAD(&qdev->cntl_xfer_list);
- init_srcu_struct(&qdev->dev_lock);
+ INIT_LIST_HEAD(&qddev->users);
for (i = 0; i < qdev->num_dbc; ++i) {
spin_lock_init(&qdev->dbc[i].xfer_lock);
qdev->dbc[i].qdev = qdev;
qdev->dbc[i].id = i;
INIT_LIST_HEAD(&qdev->dbc[i].xfer_list);
- init_srcu_struct(&qdev->dbc[i].ch_lock);
+ ret = qaicm_srcu_init(drm, &qdev->dbc[i].ch_lock);
+ if (ret)
+ return NULL;
init_waitqueue_head(&qdev->dbc[i].dbc_release);
INIT_LIST_HEAD(&qdev->dbc[i].bo_lists);
}
- qddev = devm_drm_dev_alloc(&pdev->dev, &qaic_accel_driver, struct
qaic_drm_device, drm);
- if (IS_ERR(qddev)) {
- cleanup_qdev(qdev);
- return NULL;
- }
-
- drmm_mutex_init(to_drm(qddev), &qddev->users_mutex);
- INIT_LIST_HEAD(&qddev->users);
- qddev->qdev = qdev;
- qdev->qddev = qddev;
-
return qdev;
}
@@ -472,35 +518,28 @@ static int qaic_pci_probe(struct pci_dev *pdev, const
struct pci_device_id *id)
ret = init_pci(qdev, pdev);
if (ret)
- goto cleanup_qdev;
+ return ret;
for (i = 0; i < qdev->num_dbc; ++i)
qdev->dbc[i].dbc_base = qdev->bar_2 + QAIC_DBC_OFF(i);
mhi_irq = init_msi(qdev, pdev);
- if (mhi_irq < 0) {
- ret = mhi_irq;
- goto cleanup_qdev;
- }
+ if (mhi_irq < 0)
+ return mhi_irq;
ret = qaic_create_drm_device(qdev, QAIC_NO_PARTITION);
if (ret)
- goto cleanup_qdev;
+ return ret;
qdev->mhi_cntrl = qaic_mhi_register_controller(pdev, qdev->bar_0,
mhi_irq,
qdev->single_msi);
if (IS_ERR(qdev->mhi_cntrl)) {
ret = PTR_ERR(qdev->mhi_cntrl);
- goto cleanup_drm_dev;
+ qaic_destroy_drm_device(qdev, QAIC_NO_PARTITION);
+ return ret;
}
return 0;
-
-cleanup_drm_dev:
- qaic_destroy_drm_device(qdev, QAIC_NO_PARTITION);
-cleanup_qdev:
- cleanup_qdev(qdev);
- return ret;
}
static void qaic_pci_remove(struct pci_dev *pdev)
@@ -513,7 +552,6 @@ static void qaic_pci_remove(struct pci_dev *pdev)
qaic_dev_reset_clean_local_state(qdev);
qaic_destroy_drm_device(qdev, QAIC_NO_PARTITION);
qaic_mhi_free_controller(qdev->mhi_cntrl, link_up);
- cleanup_qdev(qdev);
}
static void qaic_pci_shutdown(struct pci_dev *pdev)
--
2.34.1
