gb_operation_request_send(9)

💌 gb_operation_request_send(9) — from the Kernel API Manual, bestie

okay so picture this: it's a Kernel API Manual page, and today's main character is gb_operation_request_send(9). she sends operation request messages. that's her whole thing. let's get into it 🎀

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✨ NAME ✨

gb_operation_request_send — send an operation request message 💅

like, that's literally the job. you got an operation? you wanna request? you wanna send? boom. done.

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🌸 SYNOPSIS 🌸

int gb_operation_request_send (struct gb_operation *operation ,
gb_operation_callback callback , unsigned int timeout , gfp_t gfp );

she takes four things and returns an int. no cap. 🫶

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🦋 ARGUMENTS 🦋

• operation — the operation to initiate. this is the girl. the operation in question. the one you're kicking off ✨
• callback — the operation completion callback. she gets called later when stuff finishes, so keep her number 👑
• timeout — operation timeout in milliseconds, or zero for no timeout. so like, zero means girl has all the time in the world ⏳
• gfp — the memory flags to use for any allocations. the lil' budget for whatever memory gets grabbed along the way 💸

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💖 DESCRIPTION 💖

so here's the vibe: the caller has filled in any payload, so the request message is literally ready to go. like bags packed, shoes on, standing at the door 🧚

the callback function you supplied will be called when one of these happens:

• the response message has arrived 📬
• a unidirectional request has been sent 📤
• the operation is cancelled 🙈

...any of those means the operation is complete, bestie. that's the signal. that's the text that says "we're so back" (or "it's over", depending).

and good news: the callback function can fetch the result of the operation using gb_operation_result if desired. she has receipts 🔥

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⭐ RETURN ⭐

• 0 — the request was successfully queued in the host-driver queues. slay. ate. no notes 💅✨
• a negative errno — it was not that. something went sideways, read the errno 😭

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/greybus/operation.c
• gb_operation_sync_timeout(9)
• gb_operation_unidirectional_timeout(9)

go read those too, iykyk 👀

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lowkey reminder: the callback is where the actual "did it work" energy lives — grab the result with gb_operation_result and don't leave us hanging 🥺

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and that's the page, bestie!! delightful. it lives over in ./drivers/greybus, dated October 2026, and yes the footer says gb_operation_request_send(9) again because she loves an entrance and an exit 💜🎀⭐