scsi_unjam_host(9)

📦 version 7.3.1, in nixpkgs unstable

💅 scsi_unjam_host — like, the scsi_unjam_host(9) page, bestie ✨

Okay so this is the kernel API manual entry for scsi_unjam_host, and honestly it's giving "emergency room for your SCSI bus" energy. Sit down, grab a boba, we're getting into it 🧚

🌸 NAME 🌸

scsi_unjam_host — bestie, it literally attempts to fix a host which has a cmd that failed. That's the whole job description. Un-jam. Untangle. Rescue the vibe 💖

✨ SYNOPSIS ✨

void scsi_unjam_host (struct Scsi_Host *shost );

No cap, that's the signature. Void, one argument, we move.

🎀 ARGUMENTS 🎀

  • shost — the host you're unjamming. That's it. That's the argument. The host to unjam, periodt 👑

🦋 NOTES 🦋

Okay so picture this: when we come in here, we know — capital-K know — that all commands on the bus have either completed, failed, or timed out. We also know that no further commands are being sent to the host. So things are, like, relatively quiet 😌 which means we have the freedom to fiddle with things as we wish. Main character energy: we're literally allowed to poke around.

This is only the default implementation. It is possible for individual drivers to supply their own version of this function. If the maintainer wishes to do this, it is strongly suggested that this function be taken as a template and modified. No cap — copy the template, don't freestyle from nothing 🙈

This function was designed to correctly handle problems for about 95% of the different cases out there, and it should always provide at least a reasonable amount of error recovery. Lowkey iconic recovery rates tbh 💅

Any command marked 'failed' or 'timeout' must eventually have scsi_finish_cmd called for it. We do all of the retry stuff here, so when we restart the host after we return, it should have an empty queue. That's the vibe check — empty queue or we riot 😭🔥

💜 SEE ALSO 💜

Kernel file ./drivers/scsi/scsi_error.c — that's the whole friend group right there, so let's shout them all out 🫶:

Like, all of them. Every single one. Tag yourself, I'm scsi_eh_lock_door 🚪💀

Sign-off time, bestie 🎀 This little masterpiece lives over in ./drivers/scsi, dated October 2026, and it goes by scsi_unjam_host(9). Slay, ate, no crumbs. Byeee 💖✨🦋
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