scsi_send_eh_cmnd(9)

💅 scsi_send_eh_cmnd(9) — Kernel API Manual 🎀

okay bestie, welcome to the kernel API manual, and honestly? this one is kinda niche but lowkey iconic: scsi_send_eh_cmnd. it’s giving “we’re in error recovery and we still have to send a command,” and yes, it slays in its own chaotic way. ✨

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🌸 SYNOPSIS 🌸

enum scsi_disposition scsi_send_eh_cmnd (struct scsi_cmnd *scmd ,
unsigned char *cmnd , int cmnd_size , int timeout , unsigned sense_bytes
);

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🎀 ARGUMENTS 🎀

• scmd — the SCSI command structure we’re gonna hijack. yes, hijack. dramatic, but accurate. 💅
• cmnd — the CDB to send. this is the actual command payload, no cap.
• cmnd_size — size in bytes of cmnd. gotta know how big the CDB is, obviously.
• timeout — timeout for this request. give it a time limit or it will absolutely overstay its welcome.
• sense_bytes — size of sense data to copy, or 0. zero means we’re not copying sense data, simple as that. ✨

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🦋 DESCRIPTION 🦋

so this function is used to send a SCSI command down to a target device as part of the error recovery process. like, things already went sideways, and now we’re doing recovery-core. it’s not the main character of normal I/O, it’s the main character of “okay bestie, let’s try to fix this.” 😭

see also scsi_eh_prep_cmnd above. that one’s the setup bestie; this one’s the send-it-for-real bestie.

Return value: SUCCESS or FAILED or NEEDS_RETRY — that’s it, those are the three vibes. success, failure, or “run it back.” 🔥

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💜 SEE ALSO 💜

Kernel file ./drivers/scsi/scsi_error.c

• scsi_schedule_eh(9)
• scmd_eh_abort_handler(9)
• scsi_abort_command(9)
• scsi_eh_reset(9)
• scsi_eh_scmd_add(9)
• scsi_timeout(9)
• scsi_block_when_processing_errors(9)
• scsi_eh_prt_fail_stats(9)
• scsi_report_sense(9)
• scsi_check_sense(9)
• scsi_eh_completed_normally(9)
• scsi_eh_done(9)
• scsi_try_host_reset(9)
• scsi_try_bus_reset(9)
• scsi_try_target_reset(9)
• scsi_try_bus_device_reset(9)
• scsi_try_to_abort_cmd(9)
• scsi_eh_prep_cmnd(9)
• scsi_eh_restore_cmnd(9)
• scsi_request_sense(9)
• scsi_eh_finish_cmd(9)
• scsi_eh_get_sense(9)
• scsi_eh_tur(9)
• scsi_eh_test_devices(9)
• scsi_eh_try_stu(9)
• scsi_eh_bus_device_reset(9)
• scsi_eh_target_reset(9)
• scsi_eh_bus_reset(9)
• scsi_eh_host_reset(9)
• scsi_eh_offline_sdevs(9)
• scsi_noretry_cmd(9)
• scsi_decide_disposition(9)
• scsi_eh_lock_door(9)
• scsi_restart_operations(9)
• scsi_eh_ready_devs(9)
• scsi_eh_flush_done_q(9)
• scsi_unjam_host(9)
• scsi_error_handler(9)
• scsi_report_bus_reset(9)
• scsi_report_device_reset(9)
• scsi_ioctl_reset(9)
• scsi_get_sense_info_fld(9)

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and that’s the whole page, bestie. this lil kernel API manual moment is brought to you by ./drivers/scsi, dated October 2026, and yes, scsi_send_eh_cmnd(9) ate. periodt. 💖✨🎀