From bce7698e2e6565bb765bd0522337f29f5f312624 Mon Sep 17 00:00:00 2001 From: Haojie Li Date: Tue, 25 Aug 2026 18:08:45 +0800 Subject: drm/mediatek: Add missing IS_ERR check for ovl_adaptor platform device platform_device_register_data() can fail and return an ERR_PTR, but the return value is used without checking, leading to an invalid pointer being stored in ddp_comp[].dev and passed to component_match_add() and mtk_ddp_comp_init(), which could result in a kernel crash. Add an IS_ERR() check to jump to the error handling path on failure. Fixes: 0d9eee9118b7 ("drm/mediatek: Add drm ovl_adaptor sub driver for MT8195") Cc: stable@vger.kernel.org Signed-off-by: Haojie Li Reviewed-by: CK Hu Link: https://patchwork.kernel.org/project/linux-mediatek/patch/20260825100845.438893-1-lihaojie@kylinos.cn/ Signed-off-by: Chun-Kuang Hu --- block/blk-mq-debugfs.h | 91 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 91 insertions(+) create mode 100644 block/blk-mq-debugfs.h (limited to 'block/blk-mq-debugfs.h') diff --git a/block/blk-mq-debugfs.h b/block/blk-mq-debugfs.h new file mode 100644 index 000000000..49bb1aaa8 --- /dev/null +++ b/block/blk-mq-debugfs.h @@ -0,0 +1,91 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef INT_BLK_MQ_DEBUGFS_H +#define INT_BLK_MQ_DEBUGFS_H + +#ifdef CONFIG_BLK_DEBUG_FS + +#include + +struct blk_mq_hw_ctx; + +struct blk_mq_debugfs_attr { + const char *name; + umode_t mode; + int (*show)(void *, struct seq_file *); + ssize_t (*write)(void *, const char __user *, size_t, loff_t *); + /* Set either .show or .seq_ops. */ + const struct seq_operations *seq_ops; +}; + +int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq); +int blk_mq_debugfs_rq_show(struct seq_file *m, void *v); + +void blk_mq_debugfs_register(struct request_queue *q); +void blk_mq_debugfs_register_hctx(struct request_queue *q, + struct blk_mq_hw_ctx *hctx); +void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx); +void blk_mq_debugfs_register_hctxs(struct request_queue *q); +void blk_mq_debugfs_unregister_hctxs(struct request_queue *q); + +void blk_mq_debugfs_register_sched(struct request_queue *q); +void blk_mq_debugfs_unregister_sched(struct request_queue *q); +void blk_mq_debugfs_register_sched_hctx(struct request_queue *q, + struct blk_mq_hw_ctx *hctx); +void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx); + +void blk_mq_debugfs_register_rq_qos(struct request_queue *q); +#else +static inline void blk_mq_debugfs_register(struct request_queue *q) +{ +} + +static inline void blk_mq_debugfs_register_hctx(struct request_queue *q, + struct blk_mq_hw_ctx *hctx) +{ +} + +static inline void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx) +{ +} + +static inline void blk_mq_debugfs_register_hctxs(struct request_queue *q) +{ +} + +static inline void blk_mq_debugfs_unregister_hctxs(struct request_queue *q) +{ +} + +static inline void blk_mq_debugfs_register_sched(struct request_queue *q) +{ +} + +static inline void blk_mq_debugfs_unregister_sched(struct request_queue *q) +{ +} + +static inline void blk_mq_debugfs_register_sched_hctx(struct request_queue *q, + struct blk_mq_hw_ctx *hctx) +{ +} + +static inline void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx) +{ +} + +static inline void blk_mq_debugfs_register_rq_qos(struct request_queue *q) +{ +} + +#endif + +#if defined(CONFIG_BLK_DEV_ZONED) && defined(CONFIG_BLK_DEBUG_FS) +int queue_zone_wplugs_show(void *data, struct seq_file *m); +#else +static inline int queue_zone_wplugs_show(void *data, struct seq_file *m) +{ + return 0; +} +#endif + +#endif -- cgit v1.3.1