scsi_device_from_queue(9)

💖 scsi_device_from_queue(9) 💖

okay so bestie, welcome to the scsi_device_from_queue(9) page — that's the manual name, and yes it's a whole mouthful, but it's literally just a little kernel API helper from the Kernel API Manual and it's giving "short and sweet and does exactly one thing." 🎀

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✨ NAME ✨

scsi_device_from_queue — return the sdev associated with a request_queue 🦋

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🌸 SYNOPSIS 🌸

struct scsi_device * scsi_device_from_queue (struct request_queue *q );

like, that's it. that's the whole signature. no cap. ✨

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💅 ARGUMENTS 💅

• q — the request queue you want the sdev out of. that's the one and only input, bestie 🫶

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🌈 DESCRIPTION 🌈

so here's the vibe check: this function returns the sdev that's associated with a request queue. 🎀

and if the request_queue does not reference a SCSI device? you get NULL. periodt. no error code, no drama, just NULL — so like, check it before you go dereferencing it, iykyk 😭

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👑 SEE ALSO 👑

oh honey, this is the part where the whole friend group shows up. all of these live in the kernel file ./drivers/scsi/scsi_lib.c — go say hi 💖

• __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_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_internal_device_unblock(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)

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ok that's the whole page, you ate that 💅 go forth and grab your sdev, bestie 💖

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and finally, the cute little sign-off corner 🎀: this page comes to you from ./drivers/scsi, dated October 2026, and it's scsi_device_from_queue(9) all the way down. mwah 💋✨🌷