scsi_interna...vice_unblock(9)

💅 scsi_internal_device_unblock — a Kernel API Manual moment

okay so before we even start: this is from the Kernel API Manual, bestie. the kernel manual. we're in the grown-up docs today and honestly? we're thriving. 🎀

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🌸 NAME 🌸

scsi_internal_device_unblock — the "you may go back online, queen" of SCSI functions aka resume a device after a block request

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✨ SYNOPSIS ✨

int scsi_internal_device_unblock (struct scsi_device *sdev , enum
       scsi_device_state new_state );

like… she takes two things and gives you back an int. short, sweet, iconic. 🫶

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🦋 ARGUMENTS 🦋

• sdev — the device to resume. yes, the actual one. the little guy you put on pause earlier 👑
• new_state — the state to set the device to after unblocking. you tell her where to land, she lands there 💅

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💖 DESCRIPTION 💖

So the whole vibe here is: this restarts the device queue for a previously suspended SCSI device. that's it. that's the function. she's the "and we're back" moment. 🎬

Not me telling you this but… it may sleep. 😴 like actually. keep that in mind, okay? don't call her from a place where sleeping is illegal, iykyk.

Returns zero if successful 🎉 or a negative error code upon failure 😭. that's literally it, no surprises, we love a predictable queen.

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⭐ NOTES ⭐

This routine transitions the device to the SDEV_RUNNING state, or to one of the offline states — and heads up, that transition must be a legal transition (no cap, it has to be legal or the whole thing falls apart 🙈). once that's done, it lets the midlayer goose the queue for this device. "goose the queue" is genuinely the technical term and I will not be elaborating because I did not make it up 🪿✨

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🌈 SEE ALSO 🌈

First things first, the kernel file this lives in:

./drivers/scsi/scsi_lib.c

and now, the extended friend group (there's like forty of them, buckle up 🎢):

• __scsi_queue_insert(9)
• scsi_queue_insert(9)
• scsi_failures_reset_retries(9)
• scsi_check_passthrough(9)
• scsi_execute_cmd(9)
• scsi_run_queue(9)
• scsi_result_to_blk_status(9)
• scsi_rq_err_bytes(9)
• scsi_io_completion(9)
• scsi_alloc_sgtables(9)
• scsi_initialize_rq(9)
• scsi_alloc_request(9)
• scsi_dispatch_cmd(9)
• scsi_get_internal_cmd(9)
• scsi_put_internal_cmd(9)
• scsi_device_from_queue(9)
• scsi_block_requests(9)
• scsi_unblock_requests(9)
• scsi_mode_select(9)
• scsi_mode_sense(9)
• scsi_test_unit_ready(9)
• scsi_device_set_state(9)
• scsi_evt_emit(9)
• scsi_evt_thread(9)
• sdev_evt_send(9)
• sdev_evt_alloc(9)
• sdev_evt_send_simple(9)
• scsi_device_quiesce(9)
• scsi_device_resume(9)
• scsi_internal_device_block_nowait(9)
• scsi_device_block(9)
• scsi_internal_device_unblock_nowait(9)
• scsi_block_targets(9)
• scsi_host_block(9)
• scsi_kmap_atomic_sg(9)
• scsi_kunmap_atomic_sg(9)
• scsi_vpd_lun_id(9)
• scsi_vpd_lun_serial(9)
• scsi_vpd_tpg_id(9)
• scsi_build_sense(9)

that's the whole squad. no gatekeeping here 🫶

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so yeah, that's scsi_internal_device_unblock(9) — she unblocks, she may sleep, she returns an int, and she's legal-transition-only. slay. 💅✨

this lil love letter comes to you from the files at ./drivers/scsi, dated October 2026, and it's out. mwah. 🎀🦋💖