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qla83xx_wait_logic() is used to control the frequency of device IDC lock
retries. If in_interrupt() is true, it does 20 loops of cpu_relax().
Otherwise, it sleeps for 100ms and yields the CPU.
While in_interrupt() is ill-defined and does not provide what the name
suggests, it is not needed here: that qla83xx_wait_logic() is exclusively
called by qla83xx_idc_lock() / unlock(), and they always run from process
context. Below is an analysis of all the idc lock/unlock callers, in order
of appearance:
- qla_os.c:
qla83xx_nic_core_unrecoverable_work(),
qla83xx_idc_state_handler_work(),
qla83xx_nic_core_reset_work(),
qla83xx_service_idc_aen(), all workqueue context
- qla_os.c: qla83xx_check_nic_core_fw_alive(), has msleep()
- qla_os.c: qla83xx_set_drv_presence(), called once from
qla2x00_abort_isp(), which is bound to process-context ->abort_isp()
hook. It also invokes wait_for_completion_timeout() through the chain
qla2x00_configure_hba() => qla24xx_link_initialize() =>
qla2x00_mailbox_command().
- qla_os.c: qla83xx_clear_drv_presence(), which is called from
qla2x00_abort_isp() discussed above, and from qla2x00_remove_one()
which is PCI process-context ->remove() hook.
- qla_os.c: qla83xx_need_reset_handler(), has a one second msleep() in
a loop.
- qla_os.c: qla83xx_device_bootstrap(), called only by
qla83xx_idc_state_handler(), which has multiple msleep()
invocations.
- qla_os.c: qla83xx_idc_state_handler(), multiple msleep()
invocations.
- qla_attr.c: qla2x00_sysfs_write_reset(), sysfs bin_attribute
->write() hook, process context
- qla_init.c: qla83xx_nic_core_fw_load()
=> qla_init.c: qla2x00_initialize_adapter()
=> bound to isp_operations ->initialize_adapter() hook
** => qla_os.c: qla2x00_probe_one(), PCI ->probe() process ctx
- qla_init.c: qla83xx_initiating_reset(), msleep() in a loop.
- qla_init.c: qla83xx_nic_core_reset(), called by
qla83xx_nic_core_reset_work(), workqueue context.
Remove the in_interrupt() check, and thus replace the entirety of
qla83xx_wait_logic() with an msleep(QLA83XX_WAIT_LOGIC_MS).
Mark qla83xx_idc_lock() / unlock() with "Context: task, can sleep".
Link: https://lore.kernel.org/r/20201126132952.2287996-7-bigeasy@linutronix.de
Cc: Nilesh Javali <njavali@marvell.com>
Cc: GR-QLogic-Storage-Upstream@marvell.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Reviewed-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Ahmed S. Darwish <a.darwish@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.