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authorPranjal Ramajor Asha Kanojiya <quic_pkanojiy@quicinc.com>2023-05-17 13:35:39 -0600
committerJeffrey Hugo <quic_jhugo@quicinc.com>2023-05-23 09:51:06 -0600
commit75af0a585af93183ba68bb1b45d0d7a61e963712 (patch)
tree16a1db04c57562791d95aa21a9b8423af67c0222 /drivers
parentfaa7c4eee412ca14dd6a107cb6122d31c4277cbe (diff)
accel/qaic: Grab ch_lock during QAIC_ATTACH_SLICE_BO
During QAIC_ATTACH_SLICE_BO, we associate a BO to its DBC. We need to grab the dbc->ch_lock to make sure that DBC does not goes away while QAIC_ATTACH_SLICE_BO is still running. Fixes: ff13be830333 ("accel/qaic: Add datapath") Signed-off-by: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy@quicinc.com> Reviewed-by: Carl Vanderlip <quic_carlv@quicinc.com> Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com> Signed-off-by: Jeffrey Hugo <quic_jhugo@quicinc.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230517193540.14323-5-quic_jhugo@quicinc.com
Diffstat (limited to 'drivers')
-rw-r--r--drivers/accel/qaic/qaic_data.c20
1 files changed, 12 insertions, 8 deletions
diff --git a/drivers/accel/qaic/qaic_data.c b/drivers/accel/qaic/qaic_data.c
index c1af99cfd2d1..e42c1f9ffff8 100644
--- a/drivers/accel/qaic/qaic_data.c
+++ b/drivers/accel/qaic/qaic_data.c
@@ -924,8 +924,8 @@ int qaic_attach_slice_bo_ioctl(struct drm_device *dev, void *data, struct drm_fi
{
struct qaic_attach_slice_entry *slice_ent;
struct qaic_attach_slice *args = data;
+ int rcu_id, usr_rcu_id, qdev_rcu_id;
struct dma_bridge_chan *dbc;
- int usr_rcu_id, qdev_rcu_id;
struct drm_gem_object *obj;
struct qaic_device *qdev;
unsigned long arg_size;
@@ -969,12 +969,6 @@ int qaic_attach_slice_bo_ioctl(struct drm_device *dev, void *data, struct drm_fi
goto unlock_dev_srcu;
}
- dbc = &qdev->dbc[args->hdr.dbc_id];
- if (dbc->usr != usr) {
- ret = -EINVAL;
- goto unlock_dev_srcu;
- }
-
user_data = u64_to_user_ptr(args->data);
slice_ent = kzalloc(arg_size, GFP_KERNEL);
@@ -1006,9 +1000,16 @@ int qaic_attach_slice_bo_ioctl(struct drm_device *dev, void *data, struct drm_fi
goto put_bo;
}
+ dbc = &qdev->dbc[args->hdr.dbc_id];
+ rcu_id = srcu_read_lock(&dbc->ch_lock);
+ if (dbc->usr != usr) {
+ ret = -EINVAL;
+ goto unlock_ch_srcu;
+ }
+
ret = qaic_prepare_bo(qdev, bo, &args->hdr);
if (ret)
- goto put_bo;
+ goto unlock_ch_srcu;
ret = qaic_attach_slicing_bo(qdev, bo, &args->hdr, slice_ent);
if (ret)
@@ -1018,6 +1019,7 @@ int qaic_attach_slice_bo_ioctl(struct drm_device *dev, void *data, struct drm_fi
dma_sync_sgtable_for_cpu(&qdev->pdev->dev, bo->sgt, args->hdr.dir);
bo->dbc = dbc;
+ srcu_read_unlock(&dbc->ch_lock, rcu_id);
drm_gem_object_put(obj);
srcu_read_unlock(&qdev->dev_lock, qdev_rcu_id);
srcu_read_unlock(&usr->qddev_lock, usr_rcu_id);
@@ -1026,6 +1028,8 @@ int qaic_attach_slice_bo_ioctl(struct drm_device *dev, void *data, struct drm_fi
unprepare_bo:
qaic_unprepare_bo(qdev, bo);
+unlock_ch_srcu:
+ srcu_read_unlock(&dbc->ch_lock, rcu_id);
put_bo:
drm_gem_object_put(obj);
free_slice_ent: