v4l2_isp_pa...idate_buffer(9)

💖 NAME 💖

okay so bestie, this page is from the Kernel API Manual, and the function we're stanning is v4l2_isp_params_validate_buffer — literally just Validate a V4L2 ISP parameters buffer. that's it, that's the whole vibe ✨

---

🦋 SYNOPSIS 🦋

here's the exact signature, no cap, copy it character for character:

int v4l2_isp_params_validate_buffer (struct device *dev , struct
vb2_buffer *vb , const struct v4l2_isp_params_buffer *buffer , const
struct v4l2_isp_params_block_type_info *type_info , size_t
num_block_types );

---

🌸 ARGUMENTS 🌸

like, five whole params, let's meet them 🫶

• dev — the driver's device pointer. the main character pointer, if you will 💅
• vb — the videobuf2 buffer. yep, that vb2 buffer 🎀
• buffer — the V4L2 ISP parameters buffer itself. the whole reason we're here ✨
• type_info — the array of per-block-type validation info. one lil info blob per block type, obsessed 🌈
• num_block_types — the number of block types in the type_info array. gotta know how many we're dealing with, fr fr 🔥

---

⭐ DESCRIPTION ⭐

so what does this icon actually do? it completes the validation of a V4L2 ISP parameters buffer, verifying each configuration block's correctness before the driver can use them to program the hardware. vibe check on every block, basically 💅

now for the driver besties, listen up, this is the order of operations 🎀

1. first, validate the correctness of the vb2 buffer sizes by using the v4l2_isp_params_validate_buffer_size helper. do not skip this step, i'm serious 😭
2. once the buffer size has been validated, perform a copy of the user provided buffer into a kernel-only memory buffer — this is so userspace can't modify its content after it's been submitted to the driver 🙈
3. then call this function to complete validation. periodt ✨

bestie note: that copy step is not optional garnish, okay? it's the whole point — no kernel-only copy, no calling this function. slay responsibly 👑

---

👑 SEE ALSO 👑

• Kernel file ./include/media/v4l2-isp.h
• v4l2_isp_buffer_size(9)
• v4l2_isp_params_validate_buffer_size(9)
• struct v4l2_isp_params_block_type_info(9)
• struct v4l2_isp_stats_block_type_info(9)
• v4l2_isp_stats_init_buffer(9)
• v4l2_isp_stats_init_block(9)

go read those next, iykyk 📚💜

---

and that's the page!! 💖 this lil masterpiece lives in ./include/media, dated October 2026, and it's the manual for v4l2_isp_pa...idate_buffer(9) — yes the name is abbreviated in the header, that's just how the manpage abbreviates it, don't come for me 😭 mwah, go validate some buffers bestie 🧚‍♀️🌸