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authorTakashi Sakamoto <o-takashi@sakamocchi.jp>2016-08-13 04:13:36 +0300
committerTakashi Iwai <tiwai@suse.de>2016-08-22 12:11:05 +0300
commite12ec251e4db472e00df2aaefc13430efa25b5ea (patch)
treea9fc3ae6ac223d8ae99c5c72a69947b7973af6c1 /sound/core
parent04a56dd8ed0de401ccc10e7825d5785844c307fa (diff)
downloadlinux-e12ec251e4db472e00df2aaefc13430efa25b5ea.tar.xz
ALSA: seq: obsolete change of address limit
Former commits change existent functions so that they don't handle data in kernel space. Copying from/to userspace is done outside of the functions, thus no need to change address limit of running task. This commit obsoletes get_fs()/set_fs() and applies corresponding changes. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core')
-rw-r--r--sound/core/seq/seq_clientmgr.c73
-rw-r--r--sound/core/seq/seq_compat.c12
2 files changed, 7 insertions, 78 deletions
diff --git a/sound/core/seq/seq_clientmgr.c b/sound/core/seq/seq_clientmgr.c
index e07a53910f3d..286394be2934 100644
--- a/sound/core/seq/seq_clientmgr.c
+++ b/sound/core/seq/seq_clientmgr.c
@@ -87,21 +87,6 @@ static int snd_seq_deliver_single_event(struct snd_seq_client *client,
/*
*/
-
-static inline mm_segment_t snd_enter_user(void)
-{
- mm_segment_t fs = get_fs();
- set_fs(get_ds());
- return fs;
-}
-
-static inline void snd_leave_user(mm_segment_t fs)
-{
- set_fs(fs);
-}
-
-/*
- */
static inline unsigned short snd_seq_file_flags(struct file *file)
{
switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
@@ -2094,14 +2079,8 @@ static const struct ioctl_handler {
{ 0, NULL },
};
-static struct seq_ioctl_table {
- unsigned int cmd;
- int (*func)(struct snd_seq_client *client, void __user * arg);
-} ioctl_tables[] = {
- { 0, NULL },
-};
-
-static long seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+static long snd_seq_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
{
struct snd_seq_client *client = file->private_data;
/* To use kernel stack for ioctl data. */
@@ -2158,45 +2137,6 @@ static long seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
return err;
}
-static int snd_seq_do_ioctl(struct snd_seq_client *client, unsigned int cmd,
- void __user *arg)
-{
- struct seq_ioctl_table *p;
-
- switch (cmd) {
- case SNDRV_SEQ_IOCTL_PVERSION:
- /* return sequencer version number */
- return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0;
- case SNDRV_SEQ_IOCTL_CLIENT_ID:
- /* return the id of this client */
- return put_user(client->number, (int __user *)arg) ? -EFAULT : 0;
- }
-
- if (! arg)
- return -EFAULT;
- for (p = ioctl_tables; p->cmd; p++) {
- if (p->cmd == cmd)
- return p->func(client, arg);
- }
- pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
- cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
- return -ENOTTY;
-}
-
-
-static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
-{
- struct snd_seq_client *client = file->private_data;
-
- if (seq_ioctl(file, cmd, arg) >= 0)
- return 0;
-
- if (snd_BUG_ON(!client))
- return -ENXIO;
-
- return snd_seq_do_ioctl(client, cmd, (void __user *) arg);
-}
-
#ifdef CONFIG_COMPAT
#include "seq_compat.c"
#else
@@ -2396,8 +2336,6 @@ int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
{
const struct ioctl_handler *handler;
struct snd_seq_client *client;
- mm_segment_t fs;
- int result;
client = clientptr(clientid);
if (client == NULL)
@@ -2408,10 +2346,9 @@ int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
return handler->func(client, arg);
}
- fs = snd_enter_user();
- result = snd_seq_do_ioctl(client, cmd, (void __force __user *)arg);
- snd_leave_user(fs);
- return result;
+ pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
+ cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
+ return -ENOTTY;
}
EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
diff --git a/sound/core/seq/seq_compat.c b/sound/core/seq/seq_compat.c
index 4cfc50584218..fce5697e4261 100644
--- a/sound/core/seq/seq_compat.c
+++ b/sound/core/seq/seq_compat.c
@@ -47,7 +47,6 @@ static int snd_seq_call_port_info_ioctl(struct snd_seq_client *client, unsigned
{
int err = -EFAULT;
struct snd_seq_port_info *data;
- mm_segment_t fs;
data = kmalloc(sizeof(*data), GFP_KERNEL);
if (!data)
@@ -59,12 +58,7 @@ static int snd_seq_call_port_info_ioctl(struct snd_seq_client *client, unsigned
goto error;
data->kernel = NULL;
- if (snd_seq_kernel_client_ctl(client->number, cmd, &data) >= 0)
- return 0;
-
- fs = snd_enter_user();
- err = snd_seq_do_ioctl(client, cmd, data);
- snd_leave_user(fs);
+ err = snd_seq_kernel_client_ctl(client->number, cmd, &data);
if (err < 0)
goto error;
@@ -126,9 +120,7 @@ static long snd_seq_ioctl_compat(struct file *file, unsigned int cmd, unsigned l
case SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION:
case SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT:
case SNDRV_SEQ_IOCTL_RUNNING_MODE:
- if (seq_ioctl(file, cmd, arg) >= 0)
- return 0;
- return snd_seq_do_ioctl(client, cmd, argp);
+ return snd_seq_ioctl(file, cmd, arg);
case SNDRV_SEQ_IOCTL_CREATE_PORT32:
return snd_seq_call_port_info_ioctl(client, SNDRV_SEQ_IOCTL_CREATE_PORT, argp);
case SNDRV_SEQ_IOCTL_DELETE_PORT32: