litmus-rt.git - The LITMUS^RT kernel.

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author	Alan Stern <stern@rowland.harvard.edu>	2007-04-26 03:12:04 -0400
committer	Greg Kroah-Hartman <gregkh@suse.de>	2007-04-27 13:57:32 -0400
commit	523ded71de0c5e66973335bf99a80edfda9f401b (patch)
tree	20f47e8ed91018977d9fb7f4169a6ef8db407b82 /include/linux/debugfs.h
parent	fa1a8c23eb7d3ded8a3c6d0e653339a2bc7fca9e (diff)

device_schedule_callback() needs a module reference

This patch (as896b) fixes an oversight in the design of device_schedule_callback(). It is necessary to acquire a reference to the module owning the callback routine, to prevent the module from being unloaded before the callback can run. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Cc: Satyam Sharma <satyam.sharma@gmail.com> Cc: Neil Brown <neilb@suse.de> Cc: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

Diffstat (limited to 'include/linux/debugfs.h')

0 files changed, 0 insertions, 0 deletions

/* * sound/oss/sb_card.c * * Detection routine for the ISA Sound Blaster and compatible sound * cards. * * This file is distributed under the GNU GENERAL PUBLIC LICENSE (GPL) * Version 2 (June 1991). See the "COPYING" file distributed with this * software for more info. * * This is a complete rewrite of the detection routines. This was * prompted by the PnP API change during v2.5 and the ugly state the * code was in. * * Copyright (C) by Paul Laufer 2002. Based on code originally by * Hannu Savolainen which was modified by many others over the * years. Authors specifically mentioned in the previous version were: * Daniel Stone, Alessandro Zummo, Jeff Garzik, Arnaldo Carvalho de * Melo, Daniel Church, and myself. * * 02-05-2003 Original Release, Paul Laufer <paul@laufernet.com> * 02-07-2003 Bug made it into first release. Take two. */ #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/slab.h> #include <linux/init.h> #include "sound_config.h" #include "sb_mixer.h" #include "sb.h" #ifdef CONFIG_PNP #include <linux/pnp.h> #endif /* CONFIG_PNP */ #include "sb_card.h" MODULE_DESCRIPTION("OSS Soundblaster ISA PnP and legacy sound driver"); MODULE_LICENSE("GPL"); extern void *smw_free; static int __initdata mpu_io = 0; static int __initdata io = -1; static int __initdata irq = -1; static int __initdata dma = -1; static int __initdata dma16 = -1; static int __initdata type = 0; /* Can set this to a specific card type */ static int __initdata esstype = 0; /* ESS chip type */ static int __initdata acer = 0; /* Do acer notebook init? */ static int __initdata sm_games = 0; /* Logitech soundman games? */ static struct sb_card_config *legacy = NULL; #ifdef CONFIG_PNP static int pnp_registered; static int __initdata pnp = 1; /* static int __initdata uart401 = 0; */ #else static int __initdata pnp = 0; #endif module_param(io, int, 000); MODULE_PARM_DESC(io, "Soundblaster i/o base address (0x220,0x240,0x260,0x280)"); module_param(irq, int, 000); MODULE_PARM_DESC(irq, "IRQ (5,7,9,10)"); module_param(dma, int, 000); MODULE_PARM_DESC(dma, "8-bit DMA channel (0,1,3)"); module_param(dma16, int, 000); MODULE_PARM_DESC(dma16, "16-bit DMA channel (5,6,7)"); module_param(mpu_io, int, 000); MODULE_PARM_DESC(mpu_io, "MPU base address"); module_param(type, int, 000); MODULE_PARM_DESC(type, "You can set this to specific card type (doesn't " \ "work with pnp)"); module_param(sm_games, int, 000); MODULE_PARM_DESC(sm_games, "Enable support for Logitech soundman games " \ "(doesn't work with pnp)"); module_param(esstype, int, 000); MODULE_PARM_DESC(esstype, "ESS chip type (doesn't work with pnp)"); module_param(acer, int, 000); MODULE_PARM_DESC(acer, "Set this to detect cards in some ACER notebooks "\ "(doesn't work with pnp)"); #ifdef CONFIG_PNP module_param(pnp, int, 000); MODULE_PARM_DESC(pnp, "Went set to 0 will disable detection using PnP. "\ "Default is 1.\n"); /* Not done yet.... */ /* module_param(uart401, int, 000); MODULE_PARM_DESC(uart401, "When set to 1, will attempt to detect and enable"\ "the mpu on some clones"); */ #endif /* CONFIG_PNP */ /* OSS subsystem card registration shared by PnP and legacy routines */ static int sb_register_oss(struct sb_card_config *scc, struct sb_module_options *sbmo) { if (!request_region(scc->conf.io_base, 16, "soundblaster")) { printk(KERN_ERR "sb: ports busy.\n"); kfree(scc); return -EBUSY; } if (!sb_dsp_detect(&scc->conf, 0, 0, sbmo)) { release_region(scc->conf.io_base, 16); printk(KERN_ERR "sb: Failed DSP Detect.\n"); kfree(scc); return -ENODEV; } if(!sb_dsp_init(&scc->conf, THIS_MODULE)) { printk(KERN_ERR "sb: Failed DSP init.\n"); kfree(scc); return -ENODEV; } if(scc->mpucnf.io_base > 0) { scc->mpu = 1; printk(KERN_INFO "sb: Turning on MPU\n"); if(!probe_sbmpu(&scc->mpucnf, THIS_MODULE)) scc->mpu = 0; } return 1; } static void sb_unload(struct sb_card_config *scc) { sb_dsp_unload(&scc->conf, 0); if(scc->mpu) unload_sbmpu(&scc->mpucnf); kfree(scc); } /* Register legacy card with OSS subsystem */ static int __init sb_init_legacy(void) { struct sb_module_options sbmo = {0}; if((legacy = kzalloc(sizeof(struct sb_card_config), GFP_KERNEL)) == NULL) { printk(KERN_ERR "sb: Error: Could not allocate memory\n"); return -ENOMEM; } legacy->conf.io_base = io; legacy->conf.irq = irq; legacy->conf.dma = dma; legacy->conf.dma2 = dma16; legacy->conf.card_subtype = type; legacy->mpucnf.io_base = mpu_io; legacy->mpucnf.irq = -1; legacy->mpucnf.dma = -1; legacy->mpucnf.dma2 = -1; sbmo.esstype = esstype; sbmo.sm_games = sm_games; sbmo.acer = acer; return sb_register_oss(legacy, &sbmo); } #ifdef CONFIG_PNP /* Populate the OSS subsystem structures with information from PnP */ static void sb_dev2cfg(struct pnp_dev *dev, struct sb_card_config *scc) { scc->conf.io_base = -1; scc->conf.irq = -1; scc->conf.dma = -1; scc->conf.dma2 = -1; scc->mpucnf.io_base = -1; scc->mpucnf.irq = -1; scc->mpucnf.dma = -1; scc->mpucnf.dma2 = -1; /* All clones layout their PnP tables differently and some use different logical devices for the MPU */ if(!strncmp("CTL",scc->card_id,3)) { scc->conf.io_base = pnp_port_start(dev,0); scc->conf.irq = pnp_irq(dev,0); scc->conf.dma = pnp_dma(dev,0); scc->conf.dma2 = pnp_dma(dev,1); scc->mpucnf.io_base = pnp_port_start(dev,1); return; } if(!strncmp("tBA",scc->card_id,3)) { scc->conf.io_base = pnp_port_start(dev,0); scc->conf.irq = pnp_irq(dev,0); scc->conf.dma = pnp_dma(dev,0); scc->conf.dma2 = pnp_dma(dev,1); return; } if(!strncmp("ESS",scc->card_id,3)) { scc->conf.io_base = pnp_port_start(dev,0); scc->conf.irq = pnp_irq(dev,0); scc->conf.dma = pnp_dma(dev,0); scc->conf.dma2 = pnp_dma(dev,1); scc->mpucnf.io_base = pnp_port_start(dev,2); return; } if(!strncmp("CMI",scc->card_id,3)) { scc->conf.io_base = pnp_port_start(dev,0); scc->conf.irq = pnp_irq(dev,0); scc->conf.dma = pnp_dma(dev,0); scc->conf.dma2 = pnp_dma(dev,1); return; } if(!strncmp("RWB",scc->card_id,3)) { scc->conf.io_base = pnp_port_start(dev,0); scc->conf.irq = pnp_irq(dev,0); scc->conf.dma = pnp_dma(dev,0); return; } if(!strncmp("ALS",scc->card_id,3)) { if(!strncmp("ALS0007",scc->card_id,7)) { scc->conf.io_base = pnp_port_start(dev,0); scc->conf.irq = pnp_irq(dev,0); scc->conf.dma = pnp_dma(dev,0); } else { scc->conf.io_base = pnp_port_start(dev,0); scc->conf.irq = pnp_irq(dev,0); scc->conf.dma = pnp_dma(dev,1); scc->conf.dma2 = pnp_dma(dev,0); } return; } if(!strncmp("RTL",scc->card_id,3)) { scc->conf.io_base = pnp_port_start(dev,0); scc->conf.irq = pnp_irq(dev,0); scc->conf.dma = pnp_dma(dev,1); scc->conf.dma2 = pnp_dma(dev,0); } } static unsigned int sb_pnp_devices; /* Probe callback function for the PnP API */ static int sb_pnp_probe(struct pnp_card_link *card, const struct pnp_card_device_id *card_id) { struct sb_card_config *scc; struct sb_module_options sbmo = {0}; /* Default to 0 for PnP */ struct pnp_dev *dev = pnp_request_card_device(card, card_id->devs[0].id, NULL); if(!dev){ return -EBUSY; } if((scc = kzalloc(sizeof(struct sb_card_config), GFP_KERNEL)) == NULL) { printk(KERN_ERR "sb: Error: Could not allocate memory\n"); return -ENOMEM; } printk(KERN_INFO "sb: PnP: Found Card Named = \"%s\", Card PnP id = " \ "%s, Device PnP id = %s\n", card->card->name, card_id->id, dev->id->id); scc->card_id = card_id->id; scc->dev_id = dev->id->id; sb_dev2cfg(dev, scc); printk(KERN_INFO "sb: PnP: Detected at: io=0x%x, irq=%d, " \ "dma=%d, dma16=%d\n", scc->conf.io_base, scc->conf.irq, scc->conf.dma, scc->conf.dma2); pnp_set_card_drvdata(card, scc); sb_pnp_devices++; return sb_register_oss(scc, &sbmo); } static void sb_pnp_remove(struct pnp_card_link *card) { struct sb_card_config *scc = pnp_get_card_drvdata(card); if(!scc) return; printk(KERN_INFO "sb: PnP: Removing %s\n", scc->card_id); sb_unload(scc); } static struct pnp_card_driver sb_pnp_driver = { .name = "OSS SndBlstr", /* 16 character limit */ .id_table = sb_pnp_card_table, .probe = sb_pnp_probe, .remove = sb_pnp_remove, }; MODULE_DEVICE_TABLE(pnp_card, sb_pnp_card_table); #endif /* CONFIG_PNP */ static void sb_unregister_all(void) { #ifdef CONFIG_PNP if (pnp_registered) pnp_unregister_card_driver(&sb_pnp_driver); #endif } static int __init sb_init(void) { int lres = 0; int pres = 0; printk(KERN_INFO "sb: Init: Starting Probe...\n"); if(io != -1 && irq != -1 && dma != -1) { printk(KERN_INFO "sb: Probing legacy card with io=%x, "\ "irq=%d, dma=%d, dma16=%d\n",io, irq, dma, dma16); lres = sb_init_legacy(); } else if((io != -1 || irq != -1 || dma != -1) || (!pnp && (io == -1 && irq == -1 && dma == -1))) printk(KERN_ERR "sb: Error: At least io, irq, and dma "\ "must be set for legacy cards.\n"); #ifdef CONFIG_PNP if(pnp) { int err = pnp_register_card_driver(&sb_pnp_driver); if (!err) pnp_registered = 1; pres = sb_pnp_devices; } #endif printk(KERN_INFO "sb: Init: Done\n"); /* If either PnP or Legacy registered a card then return * success */ if (pres == 0 && lres <= 0) { sb_unregister_all(); return -ENODEV; } return 0; } static void __exit sb_exit(void) { printk(KERN_INFO "sb: Unloading...\n"); /* Unload legacy card */ if (legacy) { printk (KERN_INFO "sb: Unloading legacy card\n"); sb_unload(legacy); } sb_unregister_all(); vfree(smw_free); smw_free = NULL; } module_init(sb_init); module_exit(sb_exit);


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