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Q36eLPVDUaKfxtX6GpnFFms6dpxUa0Nzib6PRxXGQP8i2cVxZCVW X-Authority-Analysis: v=2.4 cv=KJZqylFo c=1 sm=1 tr=0 ts=6a58ba55 cx=c_pps a=XiAAW1AwiKB2Y8Wsi+sD2Q==:117 a=XiAAW1AwiKB2Y8Wsi+sD2Q==:17 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=jiCTI4zE5U7BLdzWsZGv:22 a=EIcjfB9IiI4px24ztqRk:22 a=i0EeH86SAAAA:8 a=7AElrDZCdZOXMqn8pPgA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzE2MDExNCBTYWx0ZWRfX7mVbNEiZ+33y Da45h0Iyg5g5kcm+L1rw/TczD+gXW6FRXLdiNA3gKZuwENjlJlv5+lUtqMoalUm9GVztKoyaTGC CKIaEE6a/2z/z1pg+SHXvXteY9b9LwrECwHArpciH/8G1rQCcit5oOyoZswRc/ViQ6XCCNeXKny lEGy+RmQsLp+ZLT5rJuQEuS8WQXaP3PgXpfHM4SKciAlZIuEBPp1XeFg7c+vMvADCLLTMAPZfBE kE1KjHrPxKEfzqewxqQHW4m96zV+UJqu8EQ4T5No+1mZnP/W49rsotfmEqQ6xwJrg7Ujluc9i1g NDADkkq04wNojufL6AeQXfnVC092QS4oydxh9XZ11H5JQmGJgO2UYMgnVOzTWE/KvbsS634ppjc N7VlxwRN2EGEROMs6AfatGMpsetktvG2MXxsmVOObWV0V3S0wRgIfqdhVooyBZwD99lhU66jZyB TU7WLir6GgkBWnbxRZg== X-Proofpoint-ORIG-GUID: bg2W7CliFNuaTv_3VYJOFveN9RJZ-VVM On 16/07/2026 09:11, Xingui Yang wrote: > Commit fbefe22811c3140 ("scsi: libsas: Don't always drain event workqueue > for HA resume") introduced sas_resume_ha_no_sync() to avoid a deadlock: > the PHYE_RESUME_TIMEOUT handler, running on the HA event workqueue, calls > sas_deform_port() -> sas_destruct_devices(), which removes SCSI devices and > waits for the host to become runtime-active. But the host cannot resume > until sas_resume_ha() -> sas_drain_work() returns, and the drain is blocked > on that very handler. > > However skipping the drain reintroduces a race: hisi_sas returns from > resume before all PHY UP work and libsas discovery work finish. The > controller may then autosuspend while disks are still waking up. The disks > issue IO to a suspended controller, the IO fails, and the disks get > disabled. > > Fix the deadlock at its source by moving the PHYE_RESUME_TIMEOUT > notification to after sas_drain_work(). By then the host resume is about to > complete, so device removal through device_link no longer blocks on the > resume and the cycle is broken. > > With the deadlock gone, restore sas_resume_ha() (the draining variant) in > hisi_sas and remove sas_resume_ha_no_sync(). > > The reorder is safe for the other libsas consumers (isci, pm8001, aic94xx, > mvsas). During suspend, sas_suspend_devices() calls > sas_notify_lldd_dev_gone() for each device, which sets dev->lldd_dev to > NULL. When scsi_unblock_requests re-enables I/O in resume, any I/O to a > timed-out phy's disk is immediately rejected by the LLDD before reaching > hardware: isci returns SAS_DEVICE_UNKNOWN (mapped to DID_BAD_TARGET), and > pm8001 returns SAS_PHY_DOWN (mapped to DID_NO_CONNECT). Both complete > directly via scsi_done() without entering SCSI EH. This is identical in > both the old and new ordering since lldd_dev_gone runs during suspend, > before resume. The reorder only affects when the PHYE_RESUME_TIMEOUT > handler runs (synchronized by sas_drain_work() vs. asynchronous after > resume returns), not whether I/O can reach the device. aic94xx and mvsas > do not register any PM ops and never reach this code path. > > Fixes: fbefe22811c3140 ("scsi: libsas: Don't always drain event workqueue for HA resume") > Signed-off-by: Xingui Yang Can this possibly be tested on another SCSI HBA which uses libsas? And using SATA disks.