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82cd3ba691
Tis patch try to remove useless NULL check before kfree Signed-off-by: Bernard Zhao <bernard@vivo.com> Link: https://lore.kernel.org/r/20211206014135.320720-1-bernard@vivo.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
106 lines
2.8 KiB
C
106 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Information interface for ALSA driver
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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*/
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#include <linux/slab.h>
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#include <linux/time.h>
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#include <linux/string.h>
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#include <linux/export.h>
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#include <sound/core.h>
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#include <sound/minors.h>
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#include <sound/info.h>
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#include <linux/utsname.h>
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#include <linux/mutex.h>
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/*
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* OSS compatible part
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*/
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static DEFINE_MUTEX(strings);
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static char *snd_sndstat_strings[SNDRV_CARDS][SNDRV_OSS_INFO_DEV_COUNT];
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int snd_oss_info_register(int dev, int num, char *string)
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{
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char *x;
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if (snd_BUG_ON(dev < 0 || dev >= SNDRV_OSS_INFO_DEV_COUNT))
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return -ENXIO;
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if (snd_BUG_ON(num < 0 || num >= SNDRV_CARDS))
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return -ENXIO;
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mutex_lock(&strings);
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if (string == NULL) {
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x = snd_sndstat_strings[num][dev];
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kfree(x);
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x = NULL;
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} else {
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x = kstrdup(string, GFP_KERNEL);
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if (x == NULL) {
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mutex_unlock(&strings);
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return -ENOMEM;
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}
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}
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snd_sndstat_strings[num][dev] = x;
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mutex_unlock(&strings);
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return 0;
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}
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EXPORT_SYMBOL(snd_oss_info_register);
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static int snd_sndstat_show_strings(struct snd_info_buffer *buf, char *id, int dev)
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{
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int idx, ok = -1;
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char *str;
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snd_iprintf(buf, "\n%s:", id);
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mutex_lock(&strings);
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for (idx = 0; idx < SNDRV_CARDS; idx++) {
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str = snd_sndstat_strings[idx][dev];
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if (str) {
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if (ok < 0) {
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snd_iprintf(buf, "\n");
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ok++;
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}
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snd_iprintf(buf, "%i: %s\n", idx, str);
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}
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}
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mutex_unlock(&strings);
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if (ok < 0)
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snd_iprintf(buf, " NOT ENABLED IN CONFIG\n");
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return ok;
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}
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static void snd_sndstat_proc_read(struct snd_info_entry *entry,
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struct snd_info_buffer *buffer)
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{
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snd_iprintf(buffer, "Sound Driver:3.8.1a-980706 (ALSA emulation code)\n");
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snd_iprintf(buffer, "Kernel: %s %s %s %s %s\n",
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init_utsname()->sysname,
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init_utsname()->nodename,
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init_utsname()->release,
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init_utsname()->version,
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init_utsname()->machine);
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snd_iprintf(buffer, "Config options: 0\n");
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snd_iprintf(buffer, "\nInstalled drivers: \n");
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snd_iprintf(buffer, "Type 10: ALSA emulation\n");
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snd_iprintf(buffer, "\nCard config: \n");
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snd_card_info_read_oss(buffer);
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snd_sndstat_show_strings(buffer, "Audio devices", SNDRV_OSS_INFO_DEV_AUDIO);
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snd_sndstat_show_strings(buffer, "Synth devices", SNDRV_OSS_INFO_DEV_SYNTH);
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snd_sndstat_show_strings(buffer, "Midi devices", SNDRV_OSS_INFO_DEV_MIDI);
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snd_sndstat_show_strings(buffer, "Timers", SNDRV_OSS_INFO_DEV_TIMERS);
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snd_sndstat_show_strings(buffer, "Mixers", SNDRV_OSS_INFO_DEV_MIXERS);
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}
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int __init snd_info_minor_register(void)
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{
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struct snd_info_entry *entry;
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memset(snd_sndstat_strings, 0, sizeof(snd_sndstat_strings));
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entry = snd_info_create_module_entry(THIS_MODULE, "sndstat",
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snd_oss_root);
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if (!entry)
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return -ENOMEM;
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entry->c.text.read = snd_sndstat_proc_read;
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return snd_info_register(entry); /* freed in error path */
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}
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