struct snd_timer_status uses 'timespec' type variables to record timestamp, which will be changed to an incompatible layout with updated user space using 64-bit time_t.
To handle both the old and the new layout on 32-bit architectures, this patch introduces 'struct snd_timer_status32' and 'struct snd_timer_status64' to handle 32bit time_t and 64bit time_t in native mode and compat mode, which replaces timespec with s64 type.
When glibc changes time_t to 64-bit, any recompiled program will issue ioctl commands that the kernel does not understand without this patch.
Signed-off-by: Baolin Wang baolin.wang@linaro.org --- sound/core/timer.c | 62 ++++++++++++++++++++++++++++++++++++++++----- sound/core/timer_compat.c | 57 +++++------------------------------------ 2 files changed, 62 insertions(+), 57 deletions(-)
diff --git a/sound/core/timer.c b/sound/core/timer.c index a77b461..c9d7ddb 100644 --- a/sound/core/timer.c +++ b/sound/core/timer.c @@ -79,6 +79,30 @@ struct snd_timer_user { struct mutex ioctl_lock; };
+struct snd_timer_status32 { + s32 tstamp_sec; /* Timestamp - last update */ + s32 tstamp_nsec; + unsigned int resolution; /* current period resolution in ns */ + unsigned int lost; /* counter of master tick lost */ + unsigned int overrun; /* count of read queue overruns */ + unsigned int queue; /* used queue size */ + unsigned char reserved[64]; /* reserved */ +}; + +#define SNDRV_TIMER_IOCTL_STATUS32 _IOR('T', 0x14, struct snd_timer_status32) + +struct snd_timer_status64 { + s64 tstamp_sec; /* Timestamp - last update */ + s64 tstamp_nsec; + unsigned int resolution; /* current period resolution in ns */ + unsigned int lost; /* counter of master tick lost */ + unsigned int overrun; /* count of read queue overruns */ + unsigned int queue; /* used queue size */ + unsigned char reserved[64]; /* reserved */ +}; + +#define SNDRV_TIMER_IOCTL_STATUS64 _IOR('T', 0x14, struct snd_timer_status64) + /* list of timers */ static LIST_HEAD(snd_timer_list);
@@ -1842,17 +1866,41 @@ static int snd_timer_user_params(struct file *file, return err; }
-static int snd_timer_user_status(struct file *file, - struct snd_timer_status __user *_status) +static int snd_timer_user_status32(struct file *file, + struct snd_timer_status32 __user *_status) + { + struct snd_timer_user *tu; + struct snd_timer_status32 status; + + tu = file->private_data; + if (!tu->timeri) + return -EBADFD; + memset(&status, 0, sizeof(status)); + status.tstamp_sec = tu->tstamp.tv_sec; + status.tstamp_nsec = tu->tstamp.tv_nsec; + status.resolution = snd_timer_resolution(tu->timeri); + status.lost = tu->timeri->lost; + status.overrun = tu->overrun; + spin_lock_irq(&tu->qlock); + status.queue = tu->qused; + spin_unlock_irq(&tu->qlock); + if (copy_to_user(_status, &status, sizeof(status))) + return -EFAULT; + return 0; +} + +static int snd_timer_user_status64(struct file *file, + struct snd_timer_status64 __user *_status) { struct snd_timer_user *tu; - struct snd_timer_status status; + struct snd_timer_status64 status;
tu = file->private_data; if (!tu->timeri) return -EBADFD; memset(&status, 0, sizeof(status)); - status.tstamp = timespec64_to_timespec(tu->tstamp); + status.tstamp_sec = tu->tstamp.tv_sec; + status.tstamp_nsec = tu->tstamp.tv_nsec; status.resolution = snd_timer_resolution(tu->timeri); status.lost = tu->timeri->lost; status.overrun = tu->overrun; @@ -1964,8 +2012,10 @@ static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd, return snd_timer_user_info(file, argp); case SNDRV_TIMER_IOCTL_PARAMS: return snd_timer_user_params(file, argp); - case SNDRV_TIMER_IOCTL_STATUS: - return snd_timer_user_status(file, argp); + case SNDRV_TIMER_IOCTL_STATUS32: + return snd_timer_user_status32(file, argp); + case SNDRV_TIMER_IOCTL_STATUS64: + return snd_timer_user_status64(file, argp); case SNDRV_TIMER_IOCTL_START: case SNDRV_TIMER_IOCTL_START_OLD: return snd_timer_user_start(file); diff --git a/sound/core/timer_compat.c b/sound/core/timer_compat.c index e00f7e3..0495ede 100644 --- a/sound/core/timer_compat.c +++ b/sound/core/timer_compat.c @@ -83,54 +83,11 @@ static int snd_timer_user_info_compat(struct file *file, return 0; }
-struct snd_timer_status32 { - struct compat_timespec tstamp; - u32 resolution; - u32 lost; - u32 overrun; - u32 queue; - unsigned char reserved[64]; -}; - -static int snd_timer_user_status_compat(struct file *file, - struct snd_timer_status32 __user *_status) -{ - struct snd_timer_user *tu; - struct snd_timer_status32 status; - - tu = file->private_data; - if (!tu->timeri) - return -EBADFD; - memset(&status, 0, sizeof(status)); - status.tstamp.tv_sec = tu->tstamp.tv_sec; - status.tstamp.tv_nsec = tu->tstamp.tv_nsec; - status.resolution = snd_timer_resolution(tu->timeri); - status.lost = tu->timeri->lost; - status.overrun = tu->overrun; - spin_lock_irq(&tu->qlock); - status.queue = tu->qused; - spin_unlock_irq(&tu->qlock); - if (copy_to_user(_status, &status, sizeof(status))) - return -EFAULT; - return 0; -} - -#ifdef CONFIG_X86_X32 -/* X32 ABI has the same struct as x86-64 */ -#define snd_timer_user_status_x32(file, s) \ - snd_timer_user_status(file, s) -#endif /* CONFIG_X86_X32 */ - -/* - */ - enum { SNDRV_TIMER_IOCTL_GPARAMS32 = _IOW('T', 0x04, struct snd_timer_gparams32), SNDRV_TIMER_IOCTL_INFO32 = _IOR('T', 0x11, struct snd_timer_info32), - SNDRV_TIMER_IOCTL_STATUS32 = _IOW('T', 0x14, struct snd_timer_status32), -#ifdef CONFIG_X86_X32 - SNDRV_TIMER_IOCTL_STATUS_X32 = _IOW('T', 0x14, struct snd_timer_status), -#endif /* CONFIG_X86_X32 */ + SNDRV_TIMER_IOCTL_STATUS_COMPAT32 = _IOW('T', 0x14, struct snd_timer_status32), + SNDRV_TIMER_IOCTL_STATUS_COMPAT64 = _IOW('T', 0x14, struct snd_timer_status64), };
static long __snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd, @@ -159,12 +116,10 @@ static long __snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd, return snd_timer_user_gparams_compat(file, argp); case SNDRV_TIMER_IOCTL_INFO32: return snd_timer_user_info_compat(file, argp); - case SNDRV_TIMER_IOCTL_STATUS32: - return snd_timer_user_status_compat(file, argp); -#ifdef CONFIG_X86_X32 - case SNDRV_TIMER_IOCTL_STATUS_X32: - return snd_timer_user_status_x32(file, argp); -#endif /* CONFIG_X86_X32 */ + case SNDRV_TIMER_IOCTL_STATUS_COMPAT32: + return snd_timer_user_status32(file, argp); + case SNDRV_TIMER_IOCTL_STATUS_COMPAT64: + return snd_timer_user_status64(file, argp); } return -ENOIOCTLCMD; }