STRUCT MPT3_DIAG_RELEASE(9)

💅 struct mpt3_diag_release(9)

okay bestie, so this is a page from the Kernel API Manual and it's all about struct mpt3_diag_release — like, the actual struct you hand to the kernel when you wanna send a Diag Release Message to firmware. 🎀

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✨ NAME ✨

struct mpt3_diag_release — the request you send to fire off a Diag Release Message to the firmware 🔥

and the fields inside it, since the page lists them right up in the NAME:

• @hdr — the generic header 🫶
• @unique_id — the tag that uniquely identifies the buffer you're releasing 👑

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🌸 SYNOPSIS 🌸

struct mpt3_diag_release {
    struct mpt3_ioctl_header hdr;
    uint32_t unique_id;
 };

that's it. that's the whole struct. two members. iconic, minimal, no notes. ✨

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💖 Members 💖

ngl the original page doesn't spell out the members in this section beyond what you already saw in the struct itself, so we're working with what we've got: hdr (a struct mpt3_ioctl_header, the generic header) and unique_id (a uint32_t, the tag that uniquely identifies the buffer being released). slay. 🫶

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🦋 Description 🦋

okay so here's the actual vibe check: this lets the ownership of the specified buffer be returned to the driver. 💅

and why do we care? because once that happens, an application can read that buffer without fear that the firmware is overwriting information in the buffer. no cap — that's the whole point. you get the buffer back, firmware's hands off, you can read it in peace. 😌✨

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👑 SEE ALSO 👑

• Kernel file ./drivers/scsi/mpt3sas/mpt3sas_ctl.h — the whole family lives here, go say hi 💖
• struct mpt3_ioctl_header(9)
• struct mpt3_ioctl_diag_reset(9)
• struct mpt3_ioctl_pci_info(9)
• struct mpt3_ioctl_iocinfo(9)
• struct mpt3_ioctl_eventquery(9)
• struct mpt3_ioctl_eventenable(9)
• struct MPT3_IOCTL_EVENTS(9)
• struct mpt3_ioctl_eventreport(9)
• struct mpt3_ioctl_command(9)
• struct mpt3_ioctl_btdh_mapping(9)
• struct mpt3_diag_register(9)
• struct mpt3_diag_unregister(9)
• struct mpt3_diag_query(9)
• struct mpt3_diag_read_buffer(9)
• struct mpt3_addnl_diag_query(9)
• struct mpt3_enable_diag_sbr_reload(9)
• struct mpt3_passthru_command(9)

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aaaand that's the page, babe 🧚 this one shipped out of ./drivers/scsi/mpt3sas back in October 2026 — mwah, go read your buffers safely 💜💅