es58x_check_crc(9)

💖 es58x_check_crc — kernel API manual, but make it make sense 💖

okay so bestie, welcome to es58x_check_crc(9) from the Linux Kernel API Manual ✨ this one is short and sweet and honestly kind of a vibe: it's the little function that goes "hmm, is this URB's CRC actually correct or are we being lied to" 🕵️‍♀️

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🌸 NAME 🌸

es58x_check_crc — validate the CRC value of a given URB. that's it, that's the job, and it does it slayfully 💅

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✨ SYNOPSIS ✨

int es58x_check_crc (struct es58x_device *es58x_dev , const union
es58x_urb_cmd *urb_cmd , u16 urb_len );

like, look at her. three args, returns an int, no drama 🔥

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🎀 ARGUMENTS 🎀

• es58x_dev — the ES58X device. your main character device, fr fr 👑
• urb_cmd — the URB command whose CRC we're checking. this is the thing we're side-eyeing 👀
• urb_len — length of urb_cmd. must be at least bigger than 4 (ES58X_CRC_CALC_OFFSET + sizeof(crc)). not negotiable bestie, that's the floor 🙈

lowkey important: that urb_len constraint is a real requirement, not a suggestion. respect the offset. respect the sizeof. 💀

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🦋 RETURN 🦋

• zero on success — iconic, we love a happy ending 🌈
• -EBADMSG if the CRC check fails — the CRC said no and we must accept it 😭

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🌟 SEE ALSO 🌟

and now the friend group 🫶 the kernel file itself lives at ./drivers/net/can/usb/etas_es58x/es58x_core.c and here's literally everyone else in the ES58X cinematic universe, no cap:

• es58x_calculate_crc(9)
• es58x_get_crc(9)
• es58x_set_crc(9)
• es58x_timestamp_to_ns(9)
• es58x_set_skb_timestamp(9)
• es58x_rx_timestamp(9)
• es58x_set_realtime_diff_ns(9)
• es58x_is_can_state_active(9)
• es58x_is_echo_skb_threshold_reached(9)
• es58x_can_free_echo_skb_tail(9)
• es58x_can_get_echo_skb_recovery(9)
• es58x_can_get_echo_skb(9)
• es58x_can_reset_echo_fifo(9)
• es58x_flush_pending_tx_msg(9)
• es58x_tx_ack_msg(9)
• es58x_rx_can_msg(9)
• es58x_rx_err_msg(9)
• es58x_cmd_ret_desc(9)
• es58x_rx_cmd_ret_u8(9)
• es58x_rx_cmd_ret_u32(9)
• es58x_increment_rx_errors(9)
• es58x_handle_urb_cmd(9)
• es58x_check_rx_urb(9)
• es58x_copy_to_cmd_buf(9)
• es58x_split_urb_try_recovery(9)
• es58x_handle_incomplete_cmd(9)
• es58x_split_urb(9)
• es58x_read_bulk_callback(9)
• es58x_write_bulk_callback(9)
• es58x_alloc_urb(9)
• es58x_get_tx_urb(9)
• es58x_submit_urb(9)
• es58x_send_msg(9)
• es58x_alloc_rx_urbs(9)
• es58x_free_urbs(9)
• es58x_open(9)
• es58x_stop(9)
• es58x_xmit_commit(9)
• es58x_xmit_more(9)
• es58x_start_xmit(9)
• es58x_set_mode(9)
• es58x_init_priv(9)
• es58x_init_netdev(9)
• es58x_free_netdevs(9)
• es58x_init_es58x_dev(9)
• es58x_probe(9)
• es58x_disconnect(9)

like?? that's a whole roster. everyone showed up. ate and left no crumbs 🍓

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✨ and that's the page bestie ✨ brought to you from ./drivers/net/can/usb/etas_es58x, dated October 2026 — stay CRC-validated out there, mwah 💜🎀