qla4xxx_queuecommand(9)

okay so bestie, this is qla4xxx_queuecommand(9) from the Kernel API Manual ✨ and it's literally about the SCSI layer handing a command to the driver. Buckle up, it's giving kernel-callback realness 💅

🌸 NAME 🌸

qla4xxx_queuecommand — the scsi layer issues a scsi command to the driver. periodt 💖

✨ SYNOPSIS ✨

enum scsi_qc_status qla4xxx_queuecommand (struct Scsi_Host *host ,
struct scsi_cmnd *cmd );

🎀 ARGUMENTS 🎀

• host — scsi host 🫶
• cmd — Pointer to Linux's SCSI command structure 💅

💅 DESCRIPTION 💅

okay so the remarks are giving: this routine is invoked by Linux to send a SCSI command to the driver. The mid-level driver tries to ensure that queuecommand never gets invoked concurrently with itself or the interrupt handler (although the interrupt handler may call this routine as part of request-completion handling). 🌀

Unfortunately, it sometimes calls the scheduler in interrupt context which is a big NO! NO!. 🚩😭

🔥 SEE ALSO 🔥

kernel file ./drivers/scsi/qla4xxx/ql4_os.c is the spot, and the whole function fam is:

• qla4xxx_create_chap_list(9)
• qla4xxx_find_free_chap_index(9)
• qla4xxx_set_chap_entry(9)
• qla4xxx_mark_all_devices_missing(9)
• qla4xxx_mem_free(9)
• qla4xxx_mem_alloc(9)
• qla4_8xxx_check_temp(9)
• qla4_8xxx_check_fw_alive(9)
• qla4_8xxx_watchdog(9)
• qla4xxx_timer(9)
• qla4xxx_cmd_wait(9)
• qla4xxx_soft_reset(9)
• qla4xxx_abort_active_cmds(9)
• qla4xxx_recover_adapter(9)
• qla4xxx_do_dpc(9)
• qla4xxx_free_adapter(9)
• qla4xxx_get_bidi_chap(9)
• qla4xxx_check_existing_isid(9)
• qla4xxx_update_isid(9)
• qla4xxx_should_update_isid(9)
• qla4xxx_is_flash_ddb_exists(9)
• qla4xxx_remove_failed_ddb(9)
• qla4xxx_sysfs_ddb_is_non_persistent(9)
• qla4xxx_sysfs_ddb_tgt_create(9)
• qla4xxx_sysfs_ddb_add(9)
• qla4xxx_sysfs_ddb_apply(9)
• qla4xxx_sysfs_ddb_login(9)
• qla4xxx_sysfs_ddb_logout_sid(9)
• qla4xxx_sysfs_ddb_logout(9)
• qla4xxx_sysfs_ddb_set_param(9)
• qla4xxx_sysfs_ddb_delete(9)
• qla4xxx_sysfs_ddb_export(9)
• qla4xxx_build_ddb_list(9)
• qla4xxx_wait_login_resp_boot_tgt(9)
• qla4xxx_probe_adapter(9)
• qla4xxx_prevent_other_port_reinit(9)
• qla4xxx_remove_adapter(9)
• qla4xxx_config_dma_addressing(9)
• qla4xxx_del_from_active_array(9)
• qla4xxx_eh_wait_on_command(9)
• qla4xxx_wait_for_hba_online(9)
• qla4xxx_eh_wait_for_commands(9)
• qla4xxx_eh_abort(9)
• qla4xxx_eh_device_reset(9)
• qla4xxx_eh_target_reset(9)
• qla4xxx_is_eh_active(9)
• qla4xxx_eh_host_reset(9)
• qla4xxx_pci_mmio_enabled(9)

xoxo, this page's source/version is ./drivers/scsi/qla4xxx, it's dated October 2026, and the whole thing is literally qla4xxx_queuecommand(9) 💖🫶✨