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We can simplify the code gracefully with new guard() macro and co for automatic cleanup of locks. For making changes easier, some functions widen the application of register_mutex, but those shouldn't influence on any actual performance. Also, one code block was factored out as a function so that guard() can be applied cleanly without much indentation. There are still a few remaining explicit spin_lock/unlock calls, and those are for the places where we do temporary unlock/relock, which doesn't fit well with the guard(), so far. Only the code refactoring, and no functional changes. Signed-off-by: Takashi Iwai <tiwai@suse.de> Link: https://lore.kernel.org/r/20240227085306.9764-4-tiwai@suse.de
121 lines
3.5 KiB
C
121 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* 32bit -> 64bit ioctl wrapper for timer API
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* Copyright (c) by Takashi Iwai <tiwai@suse.de>
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*/
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/* This file included from timer.c */
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#include <linux/compat.h>
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/*
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* ILP32/LP64 has different size for 'long' type. Additionally, the size
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* of storage alignment differs depending on architectures. Here, '__packed'
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* qualifier is used so that the size of this structure is multiple of 4 and
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* it fits to any architectures with 32 bit storage alignment.
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*/
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struct snd_timer_gparams32 {
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struct snd_timer_id tid;
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u32 period_num;
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u32 period_den;
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unsigned char reserved[32];
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} __packed;
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struct snd_timer_info32 {
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u32 flags;
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s32 card;
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unsigned char id[64];
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unsigned char name[80];
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u32 reserved0;
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u32 resolution;
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unsigned char reserved[64];
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};
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static int snd_timer_user_gparams_compat(struct file *file,
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struct snd_timer_gparams32 __user *user)
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{
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struct snd_timer_gparams gparams;
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if (copy_from_user(&gparams.tid, &user->tid, sizeof(gparams.tid)) ||
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get_user(gparams.period_num, &user->period_num) ||
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get_user(gparams.period_den, &user->period_den))
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return -EFAULT;
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return timer_set_gparams(&gparams);
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}
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static int snd_timer_user_info_compat(struct file *file,
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struct snd_timer_info32 __user *_info)
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{
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struct snd_timer_user *tu;
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struct snd_timer_info32 info;
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struct snd_timer *t;
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tu = file->private_data;
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if (!tu->timeri)
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return -EBADFD;
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t = tu->timeri->timer;
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if (!t)
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return -EBADFD;
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memset(&info, 0, sizeof(info));
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info.card = t->card ? t->card->number : -1;
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if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
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info.flags |= SNDRV_TIMER_FLG_SLAVE;
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strscpy(info.id, t->id, sizeof(info.id));
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strscpy(info.name, t->name, sizeof(info.name));
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info.resolution = t->hw.resolution;
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if (copy_to_user(_info, &info, sizeof(*_info)))
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return -EFAULT;
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return 0;
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}
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enum {
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SNDRV_TIMER_IOCTL_GPARAMS32 = _IOW('T', 0x04, struct snd_timer_gparams32),
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SNDRV_TIMER_IOCTL_INFO32 = _IOR('T', 0x11, struct snd_timer_info32),
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SNDRV_TIMER_IOCTL_STATUS_COMPAT32 = _IOW('T', 0x14, struct snd_timer_status32),
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SNDRV_TIMER_IOCTL_STATUS_COMPAT64 = _IOW('T', 0x14, struct snd_timer_status64),
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};
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static long __snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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void __user *argp = compat_ptr(arg);
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switch (cmd) {
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case SNDRV_TIMER_IOCTL_PVERSION:
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case SNDRV_TIMER_IOCTL_TREAD_OLD:
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case SNDRV_TIMER_IOCTL_TREAD64:
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case SNDRV_TIMER_IOCTL_GINFO:
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case SNDRV_TIMER_IOCTL_GSTATUS:
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case SNDRV_TIMER_IOCTL_SELECT:
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case SNDRV_TIMER_IOCTL_PARAMS:
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case SNDRV_TIMER_IOCTL_START:
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case SNDRV_TIMER_IOCTL_START_OLD:
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case SNDRV_TIMER_IOCTL_STOP:
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case SNDRV_TIMER_IOCTL_STOP_OLD:
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case SNDRV_TIMER_IOCTL_CONTINUE:
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case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
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case SNDRV_TIMER_IOCTL_PAUSE:
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case SNDRV_TIMER_IOCTL_PAUSE_OLD:
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case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
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return __snd_timer_user_ioctl(file, cmd, (unsigned long)argp, true);
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case SNDRV_TIMER_IOCTL_GPARAMS32:
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return snd_timer_user_gparams_compat(file, argp);
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case SNDRV_TIMER_IOCTL_INFO32:
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return snd_timer_user_info_compat(file, argp);
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case SNDRV_TIMER_IOCTL_STATUS_COMPAT32:
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return snd_timer_user_status32(file, argp);
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case SNDRV_TIMER_IOCTL_STATUS_COMPAT64:
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return snd_timer_user_status64(file, argp);
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}
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return -ENOIOCTLCMD;
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}
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static long snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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struct snd_timer_user *tu = file->private_data;
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guard(mutex)(&tu->ioctl_lock);
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return __snd_timer_user_ioctl_compat(file, cmd, arg);
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}
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