devres_add(9)

✨ devres_add(9) ✨

okay so we're in the Kernel API Manual today bestie, and this one is a little baby function that does SO much behind the scenes 💅

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🌸 NAME 🌸

devres_add — register device resource, periodt 💖

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🎀 SYNOPSIS 🎀

void devres_add (struct device *dev , void *res );

that's it. that's the whole vibe. one call, no return value, no cap ✨

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🦋 ARGUMENTS 🦋

• dev — the device you're adding the resource to 💜 like, the main character device in this whole situation
• res — the resource you're registering 🎀 the little guy you want the kernel to babysit for you

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🌈 DESCRIPTION 🌈

okay so here's the tea 🍓: you call devres_add to register the devres res to dev. simple!

BUT — and this is the important part, don't skip it — res should have been allocated using devres_alloc. like, that's not a suggestion, that's the rule fr fr 🙈

and then the actual slay happens on driver detach: the associated release function gets invoked and the devres gets freed automatically 🔥 no manual cleanup, no memory leaks, no 3am debugging session. the kernel literally handles it for you. iconic behaviour honestly 👑

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💫 SEE ALSO 💫

the whole friend group (kernel file ./drivers/base/devres.c):

• __devres_alloc_node(9)
• devres_for_each_res(9)
• devres_free(9)
• devres_find(9)
• devres_get(9)
• devres_remove(9)
• devres_destroy(9)
• devres_release(9)
• devres_release_all(9)
• devres_open_group(9)
• devres_close_group(9)
• devres_remove_group(9)
• devres_release_group(9)
• __devm_add_action(9)
• devm_remove_action_nowarn(9)
• devm_release_action(9)
• devm_kmalloc(9)
• devm_krealloc(9)
• devm_kstrdup(9)
• devm_kstrdup_const(9)
• devm_kvasprintf(9)
• devm_kasprintf(9)
• devm_kfree(9)
• devm_kmemdup(9)
• devm_kmemdup_const(9)
• devm_get_free_pages(9)
• devm_free_pages(9)
• __devm_alloc_percpu(9)

like, that's the whole group chat, go say hi 🫶

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ngl bestie, if you're registering a devres that you did NOT get from devres_alloc, just… don't. that's the one thing this page is yelling at you about 😭

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mwah 💋 that's the page! it lives in ./drivers/base, the date on it is October 2026, and it was brought to you by the Kernel API Manual — go forth and register your resources responsibly, queen 👑💖