From c74dc8ab47c1ec3927f63ca83b542c363249b3d8 Mon Sep 17 00:00:00 2001 From: Bart Van Assche Date: Tue, 14 Oct 2025 13:00:53 -0700 Subject: [PATCH] scsi: ufs: core: Fix a race condition related to the "hid" attribute group ufs_sysfs_add_nodes() is called concurrently with ufs_get_device_desc(). This may cause the following code to be called before ufs_sysfs_add_nodes(): sysfs_update_group(&hba->dev->kobj, &ufs_sysfs_hid_group); If this happens, ufs_sysfs_add_nodes() triggers a kernel warning and fails. Fix this by calling ufs_sysfs_add_nodes() before SCSI LUNs are scanned since the sysfs_update_group() call happens from the context of thread that executes ufshcd_async_scan(). This patch fixes the following kernel warning: sysfs: cannot create duplicate filename '/devices/platform/3c2d0000.ufs/hid' Workqueue: async async_run_entry_fn Call trace: dump_backtrace+0xfc/0x17c show_stack+0x18/0x28 dump_stack_lvl+0x40/0x104 dump_stack+0x18/0x3c sysfs_warn_dup+0x6c/0xc8 internal_create_group+0x1c8/0x504 sysfs_create_groups+0x38/0x9c ufs_sysfs_add_nodes+0x20/0x58 ufshcd_init+0x1114/0x134c ufshcd_pltfrm_init+0x728/0x7d8 ufs_google_probe+0x30/0x84 platform_probe+0xa0/0xe0 really_probe+0x114/0x454 __driver_probe_device+0xa4/0x160 driver_probe_device+0x44/0x23c __device_attach_driver+0x15c/0x1f4 bus_for_each_drv+0x10c/0x168 __device_attach_async_helper+0x80/0xf8 async_run_entry_fn+0x4c/0x17c process_one_work+0x26c/0x65c worker_thread+0x33c/0x498 kthread+0x110/0x134 ret_from_fork+0x10/0x20 ufshcd 3c2d0000.ufs: ufs_sysfs_add_nodes: sysfs groups creation failed (err = -17) Cc: Daniel Lee Fixes: bb7663dec67b ("scsi: ufs: sysfs: Make HID attributes visible") Signed-off-by: Bart Van Assche Link: https://patch.msgid.link/20251014200118.3390839-2-bvanassche@acm.org Signed-off-by: Martin K. Petersen --- drivers/ufs/core/ufshcd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c index 9ca27de4767a1..322641457a2d4 100644 --- a/drivers/ufs/core/ufshcd.c +++ b/drivers/ufs/core/ufshcd.c @@ -10891,8 +10891,8 @@ initialized: if (err) goto out_disable; - async_schedule(ufshcd_async_scan, hba); ufs_sysfs_add_nodes(hba->dev); + async_schedule(ufshcd_async_scan, hba); device_enable_async_suspend(dev); ufshcd_pm_qos_init(hba); -- 2.47.3