forked from Minki/linux
93de00fd1c
hdparm explicitely marks HDIO_[UNREGISTER,SCAN]_HWIF ioctls as DANGEROUS
and given the number of bugs we can assume that there are no real users:
* DMA has no chance of working because DMA resources are released by
ide_unregister() and they are never allocated again.
* Since ide_init_hwif_ports() is used for ->io_ports[] setup the ioctls
don't work for almost all hosts with "non-standard" (== non ISA-like)
layout of IDE taskfile registers (there is a lot of such host drivers).
* ide_port_init_devices() is not called when probing IDE devices so:
- drive->autotune is never set and IDE host/devices are not programmed
for the correct PIO/DMA transfer modes (=> possible data corruption)
- host specific I/O 32-bit and IRQ unmasking settings are not applied
(=> possible data corruption)
- host specific ->port_init_devs method is not called (=> no luck with
ht6560b, qd65xx and opti621 host drivers)
* ->rw_disk method is not preserved (=> no HPT3xxN chipsets support).
* ->serialized flag is not preserved (=> possible data corruption when
using icside, aec62xx (ATP850UF chipset), cmd640, cs5530, hpt366
(HPT3xxN chipsets), rz1000, sc1200, dtc2278 and ht6560b host drivers).
* ->ack_intr method is not preserved (=> needed by ide-cris, buddha,
gayle and macide host drivers).
* ->sata_scr[] and sata_misc[] is cleared by ide_unregister() and it
isn't initialized again (SiI3112 support needs them).
* To issue an ioctl() there need to be at least one IDE device present
in the system.
* ->cable_detect method is not preserved + it is not called when probing
IDE devices so cable detection is broken (however since DMA support is
also broken it doesn't really matter ;-).
* Some objects which may have already been freed in ide_unregister()
are restored by ide_hwif_restore() (i.e. ->hwgroup).
* ide_register_hw() may unregister unrelated IDE ports if free ide_hwifs[]
slot cannot be found.
* When IDE host drivers are modular unregistered port may be re-used by
different host driver that owned it first causing subtle bugs.
Since we now have a proper warm-plug support remove these ioctls,
then remove no longer needed:
- ide_register_hw() and ide_hwif_restore() functions
- 'init_default' and 'restore' arguments of ide_unregister()
- zeroeing of hwif->{dma,extra}_* fields in ide_unregister()
As an added bonus IDE core code size shrinks by ~3kB (x86-32).
v2:
* fix ide_unregister() arguments in cleanup_module() (Andrew Morton).
v3:
* fix ide_unregister() arguments in palm_bk3710.c.
Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
/*
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* This file provides autodetection for ISA PnP IDE interfaces.
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* It was tested with "ESS ES1868 Plug and Play AudioDrive" IDE interface.
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*
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* Copyright (C) 2000 Andrey Panin <pazke@donpac.ru>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* You should have received a copy of the GNU General Public License
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* (for example /usr/src/linux/COPYING); if not, write to the Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/init.h>
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#include <linux/pnp.h>
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#include <linux/ide.h>
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/* Add your devices here :)) */
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static struct pnp_device_id idepnp_devices[] = {
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/* Generic ESDI/IDE/ATA compatible hard disk controller */
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{.id = "PNP0600", .driver_data = 0},
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{.id = ""}
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};
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static int idepnp_probe(struct pnp_dev * dev, const struct pnp_device_id *dev_id)
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{
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hw_regs_t hw;
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ide_hwif_t *hwif;
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if (!(pnp_port_valid(dev, 0) && pnp_port_valid(dev, 1) && pnp_irq_valid(dev, 0)))
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return -1;
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memset(&hw, 0, sizeof(hw));
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ide_std_init_ports(&hw, pnp_port_start(dev, 0),
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pnp_port_start(dev, 1));
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hw.irq = pnp_irq(dev, 0);
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hwif = ide_find_port(hw.io_ports[IDE_DATA_OFFSET]);
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if (hwif) {
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u8 index = hwif->index;
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u8 idx[4] = { index, 0xff, 0xff, 0xff };
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ide_init_port_data(hwif, index);
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ide_init_port_hw(hwif, &hw);
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printk(KERN_INFO "ide%d: generic PnP IDE interface\n", index);
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pnp_set_drvdata(dev,hwif);
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ide_device_add(idx, NULL);
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return 0;
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}
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return -1;
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}
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static void idepnp_remove(struct pnp_dev * dev)
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{
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ide_hwif_t *hwif = pnp_get_drvdata(dev);
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if (hwif)
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ide_unregister(hwif->index);
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else
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printk(KERN_ERR "idepnp: Unable to remove device, please report.\n");
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}
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static struct pnp_driver idepnp_driver = {
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.name = "ide",
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.id_table = idepnp_devices,
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.probe = idepnp_probe,
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.remove = idepnp_remove,
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};
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static int __init pnpide_init(void)
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{
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return pnp_register_driver(&idepnp_driver);
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}
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static void __exit pnpide_exit(void)
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{
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pnp_unregister_driver(&idepnp_driver);
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}
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module_init(pnpide_init);
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module_exit(pnpide_exit);
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MODULE_LICENSE("GPL");
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