0263ea5cdd
mdiobus_register will search for any mdiobus board info registered for the bus being registered. If found, it will probe devices on the bus. That device, if for example it is an ethernet switch, may then try to register an mdio bus. Thus we need to allow recursive calls to mdiobus_register. Holding the mdio_board_lock will cause a deadlock during this recursion. Release the lock and use list_for_each_entry_safe. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
84 lines
2.1 KiB
C
84 lines
2.1 KiB
C
/*
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* mdio-boardinfo - Collect pre-declarations for MDIO devices
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <linux/mutex.h>
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#include <linux/list.h>
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#include "mdio-boardinfo.h"
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static LIST_HEAD(mdio_board_list);
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static DEFINE_MUTEX(mdio_board_lock);
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/**
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* mdiobus_setup_mdiodev_from_board_info - create and setup MDIO devices
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* from pre-collected board specific MDIO information
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* @mdiodev: MDIO device pointer
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* Context: can sleep
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*/
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void mdiobus_setup_mdiodev_from_board_info(struct mii_bus *bus,
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int (*cb)
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(struct mii_bus *bus,
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struct mdio_board_info *bi))
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{
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struct mdio_board_entry *be;
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struct mdio_board_entry *tmp;
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struct mdio_board_info *bi;
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int ret;
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mutex_lock(&mdio_board_lock);
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list_for_each_entry_safe(be, tmp, &mdio_board_list, list) {
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bi = &be->board_info;
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if (strcmp(bus->id, bi->bus_id))
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continue;
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mutex_unlock(&mdio_board_lock);
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ret = cb(bus, bi);
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mutex_lock(&mdio_board_lock);
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if (ret)
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continue;
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}
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mutex_unlock(&mdio_board_lock);
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}
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EXPORT_SYMBOL(mdiobus_setup_mdiodev_from_board_info);
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/**
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* mdio_register_board_info - register MDIO devices for a given board
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* @info: array of devices descriptors
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* @n: number of descriptors provided
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* Context: can sleep
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*
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* The board info passed can be marked with __initdata but be pointers
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* such as platform_data etc. are copied as-is
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*/
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int mdiobus_register_board_info(const struct mdio_board_info *info,
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unsigned int n)
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{
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struct mdio_board_entry *be;
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unsigned int i;
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be = kcalloc(n, sizeof(*be), GFP_KERNEL);
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if (!be)
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return -ENOMEM;
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for (i = 0; i < n; i++, be++, info++) {
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memcpy(&be->board_info, info, sizeof(*info));
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mutex_lock(&mdio_board_lock);
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list_add_tail(&be->list, &mdio_board_list);
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mutex_unlock(&mdio_board_lock);
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}
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return 0;
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}
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EXPORT_SYMBOL(mdiobus_register_board_info);
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