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HSI: cmt_speech: fix timestamp interface

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The user interface for timestamps in the new cmt_speech
driver is broken in multiple ways:

- The layout is incompatible between 32-bit and 64-bit user
  space, because of the size differences in 'struct timespec'.
  This means that the driver can not work when used with 32-bit
  user space on a 64-bit kernel.

- As there are plans to change 32-bit user space to use
  a 64-bit time_t type in the future, it will also be
  incompatible with new 32-bit user space.

- It is using ktime_get_ts under it's deprecated alias
  (do_posix_clock_monotonic_gettime).

To keep support for the user space tools written for this driver (which
have lived many years out-of-tree), the interface has been hardened to
unsigned 32-bit values.

Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
This commit is contained in:
Sebastian Reichel 2015-04-16 19:05:18 +02:00
parent b953c0d234
commit 5023a5ca8e
2 changed files with 18 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/hsi/clients/cmt_speech.c
View File

@ -451,9 +451,14 @@ static void cs_hsi_read_on_control_complete(struct hsi_msg *msg)
dev_dbg(&hi->cl->device, "Read on control: %08X\n", cmd);
cs_release_cmd(msg);
if (hi->flags & CS_FEAT_TSTAMP_RX_CTRL) {
struct timespec *tstamp =
struct timespec tspec;
struct cs_timestamp *tstamp =
&hi->mmap_cfg->tstamp_rx_ctrl;
do_posix_clock_monotonic_gettime(tstamp);
ktime_get_ts(&tspec);
tstamp->tv_sec = (__u32) tspec.tv_sec;
tstamp->tv_nsec = (__u32) tspec.tv_nsec;
}
spin_unlock(&hi->lock);

16
include/uapi/linux/hsi/cs-protocol.h
View File

@ -75,6 +75,15 @@ struct cs_buffer_config {
__u32 reserved[4];
};
/*
* struct for monotonic timestamp taken when the
* last control command was received
*/
struct cs_timestamp {
__u32 tv_sec; /* seconds */
__u32 tv_nsec; /* nanoseconds */
};
/*
* Struct describing the layout and contents of the driver mmap area.
* This information is meant as read-only information for the application.
@ -91,11 +100,8 @@ struct cs_mmap_config_block {
__u32 rx_ptr;
__u32 rx_ptr_boundary;
__u32 reserved3[2];
/*
* if enabled with CS_FEAT_TSTAMP_RX_CTRL, monotonic
* timestamp taken when the last control command was received
*/
struct timespec tstamp_rx_ctrl;
/* enabled with CS_FEAT_TSTAMP_RX_CTRL */
struct cs_timestamp tstamp_rx_ctrl;
};
#define CS_IO_MAGIC 'C'