- Fix use zero-length element array

- Move more from system wq to ordered private wq
 - Do not ignore return for drmm_mutex_init
 -----BEGIN PGP SIGNATURE-----
 
 iQJNBAABCAA3FiEE6rM8lpABPHM5FqyDm6KlpjDL6lMFAmY9IoMZHGx1Y2FzLmRl
 bWFyY2hpQGludGVsLmNvbQAKCRCboqWmMMvqUyaDD/sFDt5Ew3f79bQVoBmJ1G4B
 IHWWDsCiqd+JAo3qP85VBF3vL9qjtTk4khfSkfNrWspcBuTjmnLH88zapODLjJhC
 1CbPFVbEOwlDGZcHMIR8V2itwE/TDBpUy7OQk7mggdsXmrd1ivqsOtup0kpYLhAC
 LI3dsUT1isua5b1wMcXHrqjjITbIU6i0G0G1JYmj8X78mDcSVK/AEIgf59dQa2Cm
 kU9zemEaPZnueDATPPM3q/T3tZIDmkKEs3t7ipDvh1WDtdrTrH4uOvkAKZLCTBLE
 RQtgn6XNYQG5QFbkD7I3HszQXHZhs3poHtj75FudO8Vuz5YFvu7kTXcjdU36+kw0
 qcLCwnWkVklqyozCLuO0dXGdwyGtwsOZAplhAHv/g2FokZjZXaMU2rJu2xKK/FOE
 bzOQubQWtWLOCQvt4Xmh89T0Pj0DAC7K06p+fymL89XvtzpjnsGVDAtBcbCe/9IB
 rivJbp+YUNFB75oq7chRIDAWZZMSNQJoA93YGtvXF/sJpdHwk/ezAxX58tLmlwuu
 kmy8ZV9/beKihA0iikMVAP/i24EYtoUP+03K75S/OGuO603WGfUGa9CotDJgCtE+
 PZpaizYeIQk9Dn7gfCwu/ee6IWBKCHCtP3a5CnnFqXBpgF+2fMEWRxMWqpE+w2yr
 IqX9BHXetTFOxWLsdOvlKQ==
 =iAzA
 -----END PGP SIGNATURE-----

Merge tag 'drm-xe-fixes-2024-05-09' of https://gitlab.freedesktop.org/drm/xe/kernel into drm-fixes

- Fix use zero-length element array
- Move more from system wq to ordered private wq
- Do not ignore return for drmm_mutex_init

Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/c3rduifdp5wipkljdpuq4x6uowkc2uyzgdoft4txvp6mgvzjaj@7zw7c6uw4wrf

drivers/gpu/drm/xe/xe_guc_ads.c

@@ -100,7 +100,7 @@ struct __guc_ads_blob {
 	struct guc_engine_usage engine_usage;
 	struct guc_um_init_params um_init_params;
 	/* From here on, location is dynamic! Refer to above diagram. */
-	struct guc_mmio_reg regset[0];
+	struct guc_mmio_reg regset[];
 } __packed;
 
 #define ads_blob_read(ads_, field_) \

drivers/gpu/drm/xe/xe_guc_ct.c

@@ -120,6 +120,7 @@ static void guc_ct_fini(struct drm_device *drm, void *arg)
 {
 	struct xe_guc_ct *ct = arg;
 
+	destroy_workqueue(ct->g2h_wq);
 	xa_destroy(&ct->fence_lookup);
 }
 
@@ -145,13 +146,20 @@ int xe_guc_ct_init(struct xe_guc_ct *ct)
 
 	xe_assert(xe, !(guc_ct_size() % PAGE_SIZE));
 
-	drmm_mutex_init(&xe->drm, &ct->lock);
+	ct->g2h_wq = alloc_ordered_workqueue("xe-g2h-wq", 0);
+	if (!ct->g2h_wq)
+		return -ENOMEM;
+
 	spin_lock_init(&ct->fast_lock);
 	xa_init(&ct->fence_lookup);
 	INIT_WORK(&ct->g2h_worker, g2h_worker_func);
 	init_waitqueue_head(&ct->wq);
 	init_waitqueue_head(&ct->g2h_fence_wq);
 
+	err = drmm_mutex_init(&xe->drm, &ct->lock);
+	if (err)
+		return err;
+
 	primelockdep(ct);
 
 	bo = xe_managed_bo_create_pin_map(xe, tile, guc_ct_size(),

drivers/gpu/drm/xe/xe_guc_ct.h

@@ -34,7 +34,7 @@ static inline void xe_guc_ct_irq_handler(struct xe_guc_ct *ct)
 		return;
 
 	wake_up_all(&ct->wq);
-	queue_work(system_unbound_wq, &ct->g2h_worker);
+	queue_work(ct->g2h_wq, &ct->g2h_worker);
 	xe_guc_ct_fast_path(ct);
 }
 

drivers/gpu/drm/xe/xe_guc_ct_types.h

@@ -120,6 +120,8 @@ struct xe_guc_ct {
 	wait_queue_head_t wq;
 	/** @g2h_fence_wq: wait queue used for G2H fencing */
 	wait_queue_head_t g2h_fence_wq;
+	/** @g2h_wq: used to process G2H */
+	struct workqueue_struct *g2h_wq;
 	/** @msg: Message buffer */
 	u32 msg[GUC_CTB_MSG_MAX_LEN];
 	/** @fast_msg: Message buffer */