/* * Routine for IRQ handling from GF1/InterWave chip * Copyright (c) by Jaroslav Kysela * * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #include #include #include #ifdef CONFIG_SND_DEBUG #define STAT_ADD(x) ((x)++) #else #define STAT_ADD(x) while (0) { ; } #endif irqreturn_t snd_gus_interrupt(int irq, void *dev_id) { struct snd_gus_card * gus = dev_id; unsigned char status; int loop = 100; int handled = 0; __again: status = inb(gus->gf1.reg_irqstat); if (status == 0) return IRQ_RETVAL(handled); handled = 1; /* snd_printk(KERN_DEBUG "IRQ: status = 0x%x\n", status); */ if (status & 0x02) { STAT_ADD(gus->gf1.interrupt_stat_midi_in); if (gus->gf1.interrupt_handler_midi_in) gus->gf1.interrupt_handler_midi_in(gus); } if (status & 0x01) { STAT_ADD(gus->gf1.interrupt_stat_midi_out); if (gus->gf1.interrupt_handler_midi_out) gus->gf1.interrupt_handler_midi_out(gus); } if (status & (0x20 | 0x40)) { unsigned int already, _current_; unsigned char voice_status, voice; struct snd_gus_voice *pvoice; already = 0; while (((voice_status = snd_gf1_i_read8(gus, SNDRV_GF1_GB_VOICES_IRQ)) & 0xc0) != 0xc0) { voice = voice_status & 0x1f; _current_ = 1 << voice; if (already & _current_) continue; /* multi request */ already |= _current_; /* mark request */ #if 0 printk(KERN_DEBUG "voice = %i, voice_status = 0x%x, " "voice_verify = %i\n", voice, voice_status, inb(GUSP(gus, GF1PAGE))); #endif pvoice = &gus->gf1.voices[voice]; if (pvoice->use) { if (!(voice_status & 0x80)) { /* voice position IRQ */ STAT_ADD(pvoice->interrupt_stat_wave); pvoice->handler_wave(gus, pvoice); } if (!(voice_status & 0x40)) { /* volume ramp IRQ */ STAT_ADD(pvoice->interrupt_stat_volume); pvoice->handler_volume(gus, pvoice); } } else { STAT_ADD(gus->gf1.interrupt_stat_voice_lost); snd_gf1_i_ctrl_stop(gus, SNDRV_GF1_VB_ADDRESS_CONTROL); snd_gf1_i_ctrl_stop(gus, SNDRV_GF1_VB_VOLUME_CONTROL); } } } if (status & 0x04) { STAT_ADD(gus->gf1.interrupt_stat_timer1); if (gus->gf1.interrupt_handler_timer1) gus->gf1.interrupt_handler_timer1(gus); } if (status & 0x08) { STAT_ADD(gus->gf1.interrupt_stat_timer2); if (gus->gf1.interrupt_handler_timer2) gus->gf1.interrupt_handler_timer2(gus); } if (status & 0x80) { if (snd_gf1_i_look8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL) & 0x40) { STAT_ADD(gus->gf1.interrupt_stat_dma_write); if (gus->gf1.interrupt_handler_dma_write) gus->gf1.interrupt_handler_dma_write(gus); } if (snd_gf1_i_look8(gus, SNDRV_GF1_GB_REC_DMA_CONTROL) & 0x40) { STAT_ADD(gus->gf1.interrupt_stat_dma_read); if (gus->gf1.interrupt_handler_dma_read) gus->gf1.interrupt_handler_dma_read(gus); } } if (--loop > 0) goto __again; return IRQ_NONE; } #ifdef CONFIG_SND_DEBUG static void snd_gus_irq_info_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) { struct snd_gus_card *gus; struct snd_gus_voice *pvoice; int idx; gus = entry->private_data; snd_iprintf(buffer, "midi out = %u\n", gus->gf1.interrupt_stat_midi_out); snd_iprintf(buffer, "midi in = %u\n", gus->gf1.interrupt_stat_midi_in); snd_iprintf(buffer, "timer1 = %u\n", gus->gf1.interrupt_stat_timer1); snd_iprintf(buffer, "timer2 = %u\n", gus->gf1.interrupt_stat_timer2); snd_iprintf(buffer, "dma write = %u\n", gus->gf1.interrupt_stat_dma_write); snd_iprintf(buffer, "dma read = %u\n", gus->gf1.interrupt_stat_dma_read); snd_iprintf(buffer, "voice lost = %u\n", gus->gf1.interrupt_stat_voice_lost); for (idx = 0; idx < 32; idx++) { pvoice = &gus->gf1.voices[idx]; snd_iprintf(buffer, "voice %i: wave = %u, volume = %u\n", idx, pvoice->interrupt_stat_wave, pvoice->interrupt_stat_volume); } } void snd_gus_irq_profile_init(struct snd_gus_card *gus) { struct snd_info_entry *entry; if (! snd_card_proc_new(gus->card, "gusirq", &entry)) snd_info_set_text_ops(entry, gus, snd_gus_irq_info_read); } #endif h>030305d69fc6963c16003f50d7e8d74b02d0a143 (patch) tree363a4e34d199178769b7e7eeb26ea2620a55847b /net/decnet/TODO parent4d191b1b63c209e37bf27938ef365244d3c41084 (diff)
PCI/ASPM: Handle PCI-to-PCIe bridges as roots of PCIe hierarchies
In a struct pcie_link_state, link->root points to the pcie_link_state of the root of the PCIe hierarchy. For the topmost link, this points to itself (link->root = link). For others, we copy the pointer from the parent (link->root = link->parent->root). Previously we recognized that Root Ports originated PCIe hierarchies, but we treated PCI/PCI-X to PCIe Bridges as being in the middle of the hierarchy, and when we tried to copy the pointer from link->parent->root, there was no parent, and we dereferenced a NULL pointer: BUG: unable to handle kernel NULL pointer dereference at 0000000000000090 IP: [<ffffffff9e424350>] pcie_aspm_init_link_state+0x170/0x820 Recognize that PCI/PCI-X to PCIe Bridges originate PCIe hierarchies just like Root Ports do, so link->root for these devices should also point to itself. Fixes: 51ebfc92b72b ("PCI: Enumerate switches below PCI-to-PCIe bridges") Link: https://bugzilla.kernel.org/show_bug.cgi?id=193411 Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1022181 Tested-by: lists@ssl-mail.com Tested-by: Jayachandran C. <jnair@caviumnetworks.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: stable@vger.kernel.org # v4.2+
Diffstat (limited to 'net/decnet/TODO')