[alsa-devel] [PATCH RFC 08/26] ALSA: emu10k1: Get rid of set_fs() usage
Takashi Iwai
tiwai at suse.de
Thu May 11 23:09:07 CEST 2017
Instead of set_fs() hackery, do the straight memcpy() by passing a
flag indicating the kernel space operation.
Signed-off-by: Takashi Iwai <tiwai at suse.de>
---
sound/pci/emu10k1/emufx.c | 127 ++++++++++++++++++++++++++--------------------
1 file changed, 73 insertions(+), 54 deletions(-)
diff --git a/sound/pci/emu10k1/emufx.c b/sound/pci/emu10k1/emufx.c
index 56fc47bd6dba..dc585959ca32 100644
--- a/sound/pci/emu10k1/emufx.c
+++ b/sound/pci/emu10k1/emufx.c
@@ -311,21 +311,6 @@ static const u32 onoff_table[2] = {
};
/*
- */
-
-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);
-}
-
-/*
* controls
*/
@@ -538,7 +523,8 @@ unsigned int snd_emu10k1_efx_read(struct snd_emu10k1 *emu, unsigned int pc)
}
static int snd_emu10k1_gpr_poke(struct snd_emu10k1 *emu,
- struct snd_emu10k1_fx8010_code *icode)
+ struct snd_emu10k1_fx8010_code *icode,
+ bool in_kernel)
{
int gpr;
u32 val;
@@ -546,7 +532,9 @@ static int snd_emu10k1_gpr_poke(struct snd_emu10k1 *emu,
for (gpr = 0; gpr < (emu->audigy ? 0x200 : 0x100); gpr++) {
if (!test_bit(gpr, icode->gpr_valid))
continue;
- if (get_user(val, &icode->gpr_map[gpr]))
+ if (in_kernel)
+ val = *(u32 *)&icode->gpr_map[gpr];
+ else if (get_user(val, &icode->gpr_map[gpr]))
return -EFAULT;
snd_emu10k1_ptr_write(emu, emu->gpr_base + gpr, 0, val);
}
@@ -569,7 +557,8 @@ static int snd_emu10k1_gpr_peek(struct snd_emu10k1 *emu,
}
static int snd_emu10k1_tram_poke(struct snd_emu10k1 *emu,
- struct snd_emu10k1_fx8010_code *icode)
+ struct snd_emu10k1_fx8010_code *icode,
+ bool in_kernel)
{
int tram;
u32 addr, val;
@@ -577,9 +566,14 @@ static int snd_emu10k1_tram_poke(struct snd_emu10k1 *emu,
for (tram = 0; tram < (emu->audigy ? 0x100 : 0xa0); tram++) {
if (!test_bit(tram, icode->tram_valid))
continue;
- if (get_user(val, &icode->tram_data_map[tram]) ||
- get_user(addr, &icode->tram_addr_map[tram]))
- return -EFAULT;
+ if (in_kernel) {
+ val = *(u32 *)&icode->tram_data_map[tram];
+ addr = *(u32 *)&icode->tram_addr_map[tram];
+ } else {
+ if (get_user(val, &icode->tram_data_map[tram]) ||
+ get_user(addr, &icode->tram_addr_map[tram]))
+ return -EFAULT;
+ }
snd_emu10k1_ptr_write(emu, TANKMEMDATAREGBASE + tram, 0, val);
if (!emu->audigy) {
snd_emu10k1_ptr_write(emu, TANKMEMADDRREGBASE + tram, 0, addr);
@@ -615,16 +609,22 @@ static int snd_emu10k1_tram_peek(struct snd_emu10k1 *emu,
}
static int snd_emu10k1_code_poke(struct snd_emu10k1 *emu,
- struct snd_emu10k1_fx8010_code *icode)
+ struct snd_emu10k1_fx8010_code *icode,
+ bool in_kernel)
{
u32 pc, lo, hi;
for (pc = 0; pc < (emu->audigy ? 2*1024 : 2*512); pc += 2) {
if (!test_bit(pc / 2, icode->code_valid))
continue;
- if (get_user(lo, &icode->code[pc + 0]) ||
- get_user(hi, &icode->code[pc + 1]))
- return -EFAULT;
+ if (in_kernel) {
+ lo = *(u32 *)&icode->code[pc + 0];
+ hi = *(u32 *)&icode->code[pc + 1];
+ } else {
+ if (get_user(lo, &icode->code[pc + 0]) ||
+ get_user(hi, &icode->code[pc + 1]))
+ return -EFAULT;
+ }
snd_emu10k1_efx_write(emu, pc + 0, lo);
snd_emu10k1_efx_write(emu, pc + 1, hi);
}
@@ -665,14 +665,16 @@ snd_emu10k1_look_for_ctl(struct snd_emu10k1 *emu, struct snd_ctl_elem_id *id)
#define MAX_TLV_SIZE 256
-static unsigned int *copy_tlv(const unsigned int __user *_tlv)
+static unsigned int *copy_tlv(const unsigned int __user *_tlv, bool in_kernel)
{
unsigned int data[2];
unsigned int *tlv;
if (!_tlv)
return NULL;
- if (copy_from_user(data, _tlv, sizeof(data)))
+ if (in_kernel)
+ memcpy(data, (void *)_tlv, sizeof(data));
+ else if (copy_from_user(data, _tlv, sizeof(data)))
return NULL;
if (data[1] >= MAX_TLV_SIZE)
return NULL;
@@ -680,7 +682,9 @@ static unsigned int *copy_tlv(const unsigned int __user *_tlv)
if (!tlv)
return NULL;
memcpy(tlv, data, sizeof(data));
- if (copy_from_user(tlv + 2, _tlv + 2, data[1])) {
+ if (in_kernel) {
+ memcpy(tlv + 2, (void *)(_tlv + 2), data[1]);
+ } else if (copy_from_user(tlv + 2, _tlv + 2, data[1])) {
kfree(tlv);
return NULL;
}
@@ -690,7 +694,7 @@ static unsigned int *copy_tlv(const unsigned int __user *_tlv)
static int copy_gctl(struct snd_emu10k1 *emu,
struct snd_emu10k1_fx8010_control_gpr *gctl,
struct snd_emu10k1_fx8010_control_gpr __user *_gctl,
- int idx)
+ int idx, bool in_kernel)
{
struct snd_emu10k1_fx8010_control_old_gpr __user *octl;
@@ -718,7 +722,8 @@ static int copy_gctl_to_user(struct snd_emu10k1 *emu,
}
static int snd_emu10k1_verify_controls(struct snd_emu10k1 *emu,
- struct snd_emu10k1_fx8010_code *icode)
+ struct snd_emu10k1_fx8010_code *icode,
+ bool in_kernel)
{
unsigned int i;
struct snd_ctl_elem_id __user *_id;
@@ -728,7 +733,9 @@ static int snd_emu10k1_verify_controls(struct snd_emu10k1 *emu,
for (i = 0, _id = icode->gpr_del_controls;
i < icode->gpr_del_control_count; i++, _id++) {
- if (copy_from_user(&id, _id, sizeof(id)))
+ if (in_kernel)
+ id = *(struct snd_ctl_elem_id *)_id;
+ else if (copy_from_user(&id, _id, sizeof(id)))
return -EFAULT;
if (snd_emu10k1_look_for_ctl(emu, &id) == NULL)
return -ENOENT;
@@ -738,7 +745,8 @@ static int snd_emu10k1_verify_controls(struct snd_emu10k1 *emu,
return -ENOMEM;
err = 0;
for (i = 0; i < icode->gpr_add_control_count; i++) {
- if (copy_gctl(emu, gctl, icode->gpr_add_controls, i)) {
+ if (copy_gctl(emu, gctl, icode->gpr_add_controls, i,
+ in_kernel)) {
err = -EFAULT;
goto __error;
}
@@ -759,7 +767,8 @@ static int snd_emu10k1_verify_controls(struct snd_emu10k1 *emu,
}
for (i = 0; i < icode->gpr_list_control_count; i++) {
/* FIXME: we need to check the WRITE access */
- if (copy_gctl(emu, gctl, icode->gpr_list_controls, i)) {
+ if (copy_gctl(emu, gctl, icode->gpr_list_controls, i,
+ in_kernel)) {
err = -EFAULT;
goto __error;
}
@@ -781,7 +790,8 @@ static void snd_emu10k1_ctl_private_free(struct snd_kcontrol *kctl)
}
static int snd_emu10k1_add_controls(struct snd_emu10k1 *emu,
- struct snd_emu10k1_fx8010_code *icode)
+ struct snd_emu10k1_fx8010_code *icode,
+ bool in_kernel)
{
unsigned int i, j;
struct snd_emu10k1_fx8010_control_gpr *gctl;
@@ -800,7 +810,8 @@ static int snd_emu10k1_add_controls(struct snd_emu10k1 *emu,
}
for (i = 0; i < icode->gpr_add_control_count; i++) {
- if (copy_gctl(emu, gctl, icode->gpr_add_controls, i)) {
+ if (copy_gctl(emu, gctl, icode->gpr_add_controls, i,
+ in_kernel)) {
err = -EFAULT;
goto __error;
}
@@ -821,7 +832,7 @@ static int snd_emu10k1_add_controls(struct snd_emu10k1 *emu,
knew.device = gctl->id.device;
knew.subdevice = gctl->id.subdevice;
knew.info = snd_emu10k1_gpr_ctl_info;
- knew.tlv.p = copy_tlv(gctl->tlv);
+ knew.tlv.p = copy_tlv(gctl->tlv, in_kernel);
if (knew.tlv.p)
knew.access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
SNDRV_CTL_ELEM_ACCESS_TLV_READ;
@@ -873,7 +884,8 @@ static int snd_emu10k1_add_controls(struct snd_emu10k1 *emu,
}
static int snd_emu10k1_del_controls(struct snd_emu10k1 *emu,
- struct snd_emu10k1_fx8010_code *icode)
+ struct snd_emu10k1_fx8010_code *icode,
+ bool in_kernel)
{
unsigned int i;
struct snd_ctl_elem_id id;
@@ -883,7 +895,9 @@ static int snd_emu10k1_del_controls(struct snd_emu10k1 *emu,
for (i = 0, _id = icode->gpr_del_controls;
i < icode->gpr_del_control_count; i++, _id++) {
- if (copy_from_user(&id, _id, sizeof(id)))
+ if (in_kernel)
+ id = *(struct snd_ctl_elem_id *)_id;
+ else if (copy_from_user(&id, _id, sizeof(id)))
return -EFAULT;
down_write(&card->controls_rwsem);
ctl = snd_emu10k1_look_for_ctl(emu, &id);
@@ -941,12 +955,14 @@ static int snd_emu10k1_list_controls(struct snd_emu10k1 *emu,
}
static int snd_emu10k1_icode_poke(struct snd_emu10k1 *emu,
- struct snd_emu10k1_fx8010_code *icode)
+ struct snd_emu10k1_fx8010_code *icode,
+ bool in_kernel)
{
int err = 0;
mutex_lock(&emu->fx8010.lock);
- if ((err = snd_emu10k1_verify_controls(emu, icode)) < 0)
+ err = snd_emu10k1_verify_controls(emu, icode, in_kernel);
+ if (err < 0)
goto __error;
strlcpy(emu->fx8010.name, icode->name, sizeof(emu->fx8010.name));
/* stop FX processor - this may be dangerous, but it's better to miss
@@ -956,11 +972,20 @@ static int snd_emu10k1_icode_poke(struct snd_emu10k1 *emu,
else
snd_emu10k1_ptr_write(emu, DBG, 0, emu->fx8010.dbg | EMU10K1_DBG_SINGLE_STEP);
/* ok, do the main job */
- if ((err = snd_emu10k1_del_controls(emu, icode)) < 0 ||
- (err = snd_emu10k1_gpr_poke(emu, icode)) < 0 ||
- (err = snd_emu10k1_tram_poke(emu, icode)) < 0 ||
- (err = snd_emu10k1_code_poke(emu, icode)) < 0 ||
- (err = snd_emu10k1_add_controls(emu, icode)) < 0)
+ err = snd_emu10k1_del_controls(emu, icode, in_kernel);
+ if (err < 0)
+ goto __error;
+ err = snd_emu10k1_gpr_poke(emu, icode, in_kernel);
+ if (err < 0)
+ goto __error;
+ err = snd_emu10k1_tram_poke(emu, icode, in_kernel);
+ if (err < 0)
+ goto __error;
+ err = snd_emu10k1_code_poke(emu, icode, in_kernel);
+ if (err < 0)
+ goto __error;
+ err = snd_emu10k1_add_controls(emu, icode, in_kernel);
+ if (err < 0)
goto __error;
/* start FX processor when the DSP code is updated */
if (emu->audigy)
@@ -1179,7 +1204,6 @@ static int _snd_emu10k1_audigy_init_efx(struct snd_emu10k1 *emu)
struct snd_emu10k1_fx8010_code *icode = NULL;
struct snd_emu10k1_fx8010_control_gpr *controls = NULL, *ctl;
u32 *gpr_map;
- mm_segment_t seg;
err = -ENOMEM;
icode = kzalloc(sizeof(*icode), GFP_KERNEL);
@@ -1739,13 +1763,11 @@ A_OP(icode, &ptr, iMAC0, A_GPR(var), A_GPR(var), A_GPR(vol), A_EXTIN(input))
while (ptr < 0x400)
A_OP(icode, &ptr, 0x0f, 0xc0, 0xc0, 0xcf, 0xc0);
- seg = snd_enter_user();
icode->gpr_add_control_count = nctl;
icode->gpr_add_controls = (struct snd_emu10k1_fx8010_control_gpr __user *)controls;
emu->support_tlv = 1; /* support TLV */
- err = snd_emu10k1_icode_poke(emu, icode);
+ err = snd_emu10k1_icode_poke(emu, icode, true);
emu->support_tlv = 0; /* clear again */
- snd_leave_user(seg);
__err:
kfree(controls);
@@ -1817,7 +1839,6 @@ static int _snd_emu10k1_init_efx(struct snd_emu10k1 *emu)
struct snd_emu10k1_fx8010_pcm_rec *ipcm = NULL;
struct snd_emu10k1_fx8010_control_gpr *controls = NULL, *ctl;
u32 *gpr_map;
- mm_segment_t seg;
err = -ENOMEM;
icode = kzalloc(sizeof(*icode), GFP_KERNEL);
@@ -2368,13 +2389,11 @@ static int _snd_emu10k1_init_efx(struct snd_emu10k1 *emu)
if ((err = snd_emu10k1_fx8010_tram_setup(emu, ipcm->buffer_size)) < 0)
goto __err;
- seg = snd_enter_user();
icode->gpr_add_control_count = i;
icode->gpr_add_controls = (struct snd_emu10k1_fx8010_control_gpr __user *)controls;
emu->support_tlv = 1; /* support TLV */
- err = snd_emu10k1_icode_poke(emu, icode);
+ err = snd_emu10k1_icode_poke(emu, icode, true);
emu->support_tlv = 0; /* clear again */
- snd_leave_user(seg);
if (err >= 0)
err = snd_emu10k1_ipcm_poke(emu, ipcm);
__err:
@@ -2537,7 +2556,7 @@ static int snd_emu10k1_fx8010_ioctl(struct snd_hwdep * hw, struct file *file, un
icode = memdup_user(argp, sizeof(*icode));
if (IS_ERR(icode))
return PTR_ERR(icode);
- res = snd_emu10k1_icode_poke(emu, icode);
+ res = snd_emu10k1_icode_poke(emu, icode, false);
kfree(icode);
return res;
case SNDRV_EMU10K1_IOCTL_CODE_PEEK:
--
2.12.2
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