git: 1f7a6325fe1b - main - sound(4): Remove pointless Giant from bus_dma_tag_create().
Alexander Motin
mav at FreeBSD.org
Sat Sep 4 22:30:43 UTC 2021
The branch main has been updated by mav:
URL: https://cgit.FreeBSD.org/src/commit/?id=1f7a6325fe1b628c18b51d94eeec879c38c650b8
commit 1f7a6325fe1b628c18b51d94eeec879c38c650b8
Author: Alexander Motin <mav at FreeBSD.org>
AuthorDate: 2021-09-04 22:22:53 +0000
Commit: Alexander Motin <mav at FreeBSD.org>
CommitDate: 2021-09-04 22:30:36 +0000
sound(4): Remove pointless Giant from bus_dma_tag_create().
None of the drivers really implement asynchronous buffer loading, so
they don't need lock there. The only question is which of them have
BUS_DMA_NOWAIT flag there already, and to which it should be added.
---
sys/dev/sound/isa/ad1816.c | 4 ++--
sys/dev/sound/isa/ess.c | 4 ++--
sys/dev/sound/isa/mss.c | 2 +-
sys/dev/sound/isa/sb16.c | 2 +-
sys/dev/sound/isa/sb8.c | 2 +-
sys/dev/sound/pci/aureal.c | 4 ++--
sys/dev/sound/pci/cs4281.c | 4 ++--
sys/dev/sound/pci/csapcm.c | 4 ++--
sys/dev/sound/pci/emu10k1.c | 8 ++++----
sys/dev/sound/pci/emu10kx.c | 4 ++--
sys/dev/sound/pci/envy24.c | 10 ++++++----
sys/dev/sound/pci/fm801.c | 4 ++--
sys/dev/sound/pci/hdspe.c | 16 ++++++++--------
sys/dev/sound/pci/maestro.c | 8 ++++----
sys/dev/sound/pci/solo.c | 29 +----------------------------
sys/dev/sound/pci/t4dwave.c | 4 ++--
sys/dev/sound/pci/vibes.c | 4 ++--
sys/dev/sound/pcm/buffer.c | 2 +-
18 files changed, 45 insertions(+), 70 deletions(-)
diff --git a/sys/dev/sound/isa/ad1816.c b/sys/dev/sound/isa/ad1816.c
index e8d7ac7cf62f..97da82c21ff5 100644
--- a/sys/dev/sound/isa/ad1816.c
+++ b/sys/dev/sound/isa/ad1816.c
@@ -620,8 +620,8 @@ ad1816_attach(device_t dev)
/*filter*/NULL, /*filterarg*/NULL,
/*maxsize*/ad1816->bufsize, /*nsegments*/1,
/*maxsegz*/0x3ffff,
- /*flags*/0, /*lockfunc*/busdma_lock_mutex,
- /*lockarg*/ &Giant, &ad1816->parent_dmat) != 0) {
+ /*flags*/0, /*lockfunc*/NULL, /*lockarg*/NULL,
+ &ad1816->parent_dmat) != 0) {
device_printf(dev, "unable to create dma tag\n");
goto no;
}
diff --git a/sys/dev/sound/isa/ess.c b/sys/dev/sound/isa/ess.c
index 424e757a4b00..46405ec48aac 100644
--- a/sys/dev/sound/isa/ess.c
+++ b/sys/dev/sound/isa/ess.c
@@ -859,8 +859,8 @@ ess_attach(device_t dev)
/*filter*/NULL, /*filterarg*/NULL,
/*maxsize*/sc->bufsize, /*nsegments*/1,
/*maxsegz*/0x3ffff,
- /*flags*/0, /*lockfunc*/busdma_lock_mutex,
- /*lockarg*/&Giant, &sc->parent_dmat) != 0) {
+ /*flags*/0, /*lockfunc*/NULL, /*lockarg*/NULL,
+ &sc->parent_dmat) != 0) {
device_printf(dev, "unable to create dma tag\n");
goto no;
}
diff --git a/sys/dev/sound/isa/mss.c b/sys/dev/sound/isa/mss.c
index eacbbf85849c..745a20dbf1f0 100644
--- a/sys/dev/sound/isa/mss.c
+++ b/sys/dev/sound/isa/mss.c
@@ -1732,7 +1732,7 @@ mss_doattach(device_t dev, struct mss_info *mss)
/*filter*/NULL, /*filterarg*/NULL,
/*maxsize*/mss->bufsize, /*nsegments*/1,
/*maxsegz*/0x3ffff, /*flags*/0,
- /*lockfunc*/busdma_lock_mutex, /*lockarg*/&Giant,
+ /*lockfunc*/NULL, /*lockarg*/NULL,
&mss->parent_dmat) != 0) {
device_printf(dev, "unable to create dma tag\n");
goto no;
diff --git a/sys/dev/sound/isa/sb16.c b/sys/dev/sound/isa/sb16.c
index 73ec7c56245e..38e15a427d50 100644
--- a/sys/dev/sound/isa/sb16.c
+++ b/sys/dev/sound/isa/sb16.c
@@ -846,7 +846,7 @@ sb16_attach(device_t dev)
/*filter*/NULL, /*filterarg*/NULL,
/*maxsize*/sb->bufsize, /*nsegments*/1,
/*maxsegz*/0x3ffff, /*flags*/0,
- /*lockfunc*/busdma_lock_mutex, /*lockarg*/&Giant,
+ /*lockfunc*/NULL, /*lockarg*/NULL,
&sb->parent_dmat) != 0) {
device_printf(dev, "unable to create dma tag\n");
goto no;
diff --git a/sys/dev/sound/isa/sb8.c b/sys/dev/sound/isa/sb8.c
index 779c6631b264..3fcc1770e136 100644
--- a/sys/dev/sound/isa/sb8.c
+++ b/sys/dev/sound/isa/sb8.c
@@ -743,7 +743,7 @@ sb_attach(device_t dev)
/*filter*/NULL, /*filterarg*/NULL,
/*maxsize*/sb->bufsize, /*nsegments*/1,
/*maxsegz*/0x3ffff, /*flags*/0,
- /*lockfunc*/busdma_lock_mutex, /*lockarg*/&Giant,
+ /*lockfunc*/NULL, /*lockarg*/NULL,
&sb->parent_dmat) != 0) {
device_printf(dev, "unable to create dma tag\n");
goto no;
diff --git a/sys/dev/sound/pci/aureal.c b/sys/dev/sound/pci/aureal.c
index f4b9906e20e0..820e603192af 100644
--- a/sys/dev/sound/pci/aureal.c
+++ b/sys/dev/sound/pci/aureal.c
@@ -642,8 +642,8 @@ au_pci_attach(device_t dev)
/*highaddr*/BUS_SPACE_MAXADDR,
/*filter*/NULL, /*filterarg*/NULL,
/*maxsize*/AU_BUFFSIZE, /*nsegments*/1, /*maxsegz*/0x3ffff,
- /*flags*/0, /*lockfunc*/busdma_lock_mutex,
- /*lockarg*/&Giant, &au->parent_dmat) != 0) {
+ /*flags*/0, /*lockfunc*/NULL, /*lockarg*/NULL,
+ &au->parent_dmat) != 0) {
device_printf(dev, "unable to create dma tag\n");
goto bad;
}
diff --git a/sys/dev/sound/pci/cs4281.c b/sys/dev/sound/pci/cs4281.c
index fe73e14edb29..b955a6284800 100644
--- a/sys/dev/sound/pci/cs4281.c
+++ b/sys/dev/sound/pci/cs4281.c
@@ -823,8 +823,8 @@ cs4281_pci_attach(device_t dev)
/*filter*/NULL, /*filterarg*/NULL,
/*maxsize*/sc->bufsz, /*nsegments*/1,
/*maxsegz*/0x3ffff,
- /*flags*/0, /*lockfunc*/busdma_lock_mutex,
- /*lockarg*/&Giant, &sc->parent_dmat) != 0) {
+ /*flags*/0, /*lockfunc*/NULL, /*lockarg*/NULL,
+ &sc->parent_dmat) != 0) {
device_printf(dev, "unable to create dma tag\n");
goto bad;
}
diff --git a/sys/dev/sound/pci/csapcm.c b/sys/dev/sound/pci/csapcm.c
index a0b35c909931..7fd55291d876 100644
--- a/sys/dev/sound/pci/csapcm.c
+++ b/sys/dev/sound/pci/csapcm.c
@@ -716,8 +716,8 @@ csa_allocres(struct csa_info *csa, device_t dev)
/*highaddr*/BUS_SPACE_MAXADDR,
/*filter*/NULL, /*filterarg*/NULL,
/*maxsize*/CS461x_BUFFSIZE, /*nsegments*/1, /*maxsegz*/0x3ffff,
- /*flags*/0, /*lockfunc*/busdma_lock_mutex,
- /*lockarg*/&Giant, &csa->parent_dmat) != 0)
+ /*flags*/0, /*lockfunc*/NULL, /*lockarg*/NULL,
+ &csa->parent_dmat) != 0)
return (1);
return (0);
diff --git a/sys/dev/sound/pci/emu10k1.c b/sys/dev/sound/pci/emu10k1.c
index 9ee71ed96847..c8829a4017e3 100644
--- a/sys/dev/sound/pci/emu10k1.c
+++ b/sys/dev/sound/pci/emu10k1.c
@@ -1328,8 +1328,8 @@ emu_malloc(struct sc_info *sc, u_int32_t sz, bus_addr_t *addr,
*addr = 0;
if (bus_dmamem_alloc(sc->parent_dmat, &buf, BUS_DMA_NOWAIT, map))
return NULL;
- if (bus_dmamap_load(sc->parent_dmat, *map, buf, sz, emu_setmap, addr, 0)
- || !*addr) {
+ if (bus_dmamap_load(sc->parent_dmat, *map, buf, sz, emu_setmap, addr,
+ BUS_DMA_NOWAIT) || !*addr) {
bus_dmamem_free(sc->parent_dmat, buf, *map);
return NULL;
}
@@ -2107,8 +2107,8 @@ emu_pci_attach(device_t dev)
/*highaddr*/BUS_SPACE_MAXADDR,
/*filter*/NULL, /*filterarg*/NULL,
/*maxsize*/sc->bufsz, /*nsegments*/1, /*maxsegz*/0x3ffff,
- /*flags*/0, /*lockfunc*/busdma_lock_mutex,
- /*lockarg*/&Giant, &sc->parent_dmat) != 0) {
+ /*flags*/0, /*lockfunc*/NULL, /*lockarg*/NULL,
+ &sc->parent_dmat) != 0) {
device_printf(dev, "unable to create dma tag\n");
goto bad;
}
diff --git a/sys/dev/sound/pci/emu10kx.c b/sys/dev/sound/pci/emu10kx.c
index 5ae760845008..611af91de4d4 100644
--- a/sys/dev/sound/pci/emu10kx.c
+++ b/sys/dev/sound/pci/emu10kx.c
@@ -2700,8 +2700,8 @@ emu_init(struct emu_sc_info *sc)
/* highaddr */ BUS_SPACE_MAXADDR,
/* filter */ NULL, /* filterarg */ NULL,
/* maxsize */ EMU_MAX_BUFSZ, /* nsegments */ 1, /* maxsegz */ 0x3ffff,
- /* flags */ 0, /* lockfunc */ busdma_lock_mutex,
- /* lockarg */ &Giant, &(sc->mem.dmat)) != 0) {
+ /* flags */ 0, /* lockfunc */NULL, /* lockarg */NULL,
+ &sc->mem.dmat) != 0) {
device_printf(sc->dev, "unable to create dma tag\n");
bus_dma_tag_destroy(sc->mem.dmat);
return (ENOMEM);
diff --git a/sys/dev/sound/pci/envy24.c b/sys/dev/sound/pci/envy24.c
index a6cb28ab6040..36f453bd9252 100644
--- a/sys/dev/sound/pci/envy24.c
+++ b/sys/dev/sound/pci/envy24.c
@@ -2264,12 +2264,14 @@ envy24_dmainit(struct sc_info *sc)
#if(0)
device_printf(sc->dev, "envy24_dmainit(): bus_dmamem_load(): sc->pmap\n");
#endif
- if (bus_dmamap_load(sc->dmat, sc->pmap, sc->pbuf, sc->psize, envy24_dmapsetmap, sc, 0))
+ if (bus_dmamap_load(sc->dmat, sc->pmap, sc->pbuf, sc->psize,
+ envy24_dmapsetmap, sc, BUS_DMA_NOWAIT))
goto bad;
#if(0)
device_printf(sc->dev, "envy24_dmainit(): bus_dmamem_load(): sc->rmap\n");
#endif
- if (bus_dmamap_load(sc->dmat, sc->rmap, sc->rbuf, sc->rsize, envy24_dmarsetmap, sc, 0))
+ if (bus_dmamap_load(sc->dmat, sc->rmap, sc->rbuf, sc->rsize,
+ envy24_dmarsetmap, sc, BUS_DMA_NOWAIT))
goto bad;
bzero(sc->pbuf, sc->psize);
bzero(sc->rbuf, sc->rsize);
@@ -2534,8 +2536,8 @@ envy24_alloc_resource(struct sc_info *sc)
/*filter*/NULL, /*filterarg*/NULL,
/*maxsize*/BUS_SPACE_MAXSIZE_ENVY24,
/*nsegments*/1, /*maxsegsz*/0x3ffff,
- /*flags*/0, /*lockfunc*/busdma_lock_mutex,
- /*lockarg*/&Giant, &sc->dmat) != 0) {
+ /*flags*/0, /*lockfunc*/NULL, /*lockarg*/NULL,
+ &sc->dmat) != 0) {
device_printf(sc->dev, "unable to create dma tag\n");
return ENXIO;
}
diff --git a/sys/dev/sound/pci/fm801.c b/sys/dev/sound/pci/fm801.c
index 886d50f27fe7..3a7e0877ae7a 100644
--- a/sys/dev/sound/pci/fm801.c
+++ b/sys/dev/sound/pci/fm801.c
@@ -632,8 +632,8 @@ fm801_pci_attach(device_t dev)
/*highaddr*/BUS_SPACE_MAXADDR,
/*filter*/NULL, /*filterarg*/NULL,
/*maxsize*/fm801->bufsz, /*nsegments*/1, /*maxsegz*/0x3ffff,
- /*flags*/0, /*lockfunc*/busdma_lock_mutex,
- /*lockarg*/&Giant, &fm801->parent_dmat) != 0) {
+ /*flags*/0, /*lockfunc*/NULL, /*lockarg*/NULL,
+ &fm801->parent_dmat) != 0) {
device_printf(dev, "unable to create dma tag\n");
goto oops;
}
diff --git a/sys/dev/sound/pci/hdspe.c b/sys/dev/sound/pci/hdspe.c
index 6eb0436816a6..f91e6f6d4931 100644
--- a/sys/dev/sound/pci/hdspe.c
+++ b/sys/dev/sound/pci/hdspe.c
@@ -172,8 +172,8 @@ hdspe_alloc_resources(struct sc_info *sc)
/*nsegments*/2,
/*maxsegsz*/HDSPE_DMASEGSIZE,
/*flags*/0,
- /*lockfunc*/busdma_lock_mutex,
- /*lockarg*/&Giant,
+ /*lockfunc*/NULL,
+ /*lockarg*/NULL,
/*dmatag*/&sc->dmat) != 0) {
device_printf(sc->dev, "Unable to create dma tag.\n");
return (ENXIO);
@@ -182,27 +182,27 @@ hdspe_alloc_resources(struct sc_info *sc)
sc->bufsize = HDSPE_DMASEGSIZE;
/* pbuf (play buffer). */
- if (bus_dmamem_alloc(sc->dmat, (void **)&sc->pbuf,
- BUS_DMA_NOWAIT, &sc->pmap)) {
+ if (bus_dmamem_alloc(sc->dmat, (void **)&sc->pbuf, BUS_DMA_WAITOK,
+ &sc->pmap)) {
device_printf(sc->dev, "Can't alloc pbuf.\n");
return (ENXIO);
}
if (bus_dmamap_load(sc->dmat, sc->pmap, sc->pbuf, sc->bufsize,
- hdspe_dmapsetmap, sc, 0)) {
+ hdspe_dmapsetmap, sc, BUS_DMA_NOWAIT)) {
device_printf(sc->dev, "Can't load pbuf.\n");
return (ENXIO);
}
/* rbuf (rec buffer). */
- if (bus_dmamem_alloc(sc->dmat, (void **)&sc->rbuf,
- BUS_DMA_NOWAIT, &sc->rmap)) {
+ if (bus_dmamem_alloc(sc->dmat, (void **)&sc->rbuf, BUS_DMA_WAITOK,
+ &sc->rmap)) {
device_printf(sc->dev, "Can't alloc rbuf.\n");
return (ENXIO);
}
if (bus_dmamap_load(sc->dmat, sc->rmap, sc->rbuf, sc->bufsize,
- hdspe_dmapsetmap, sc, 0)) {
+ hdspe_dmapsetmap, sc, BUS_DMA_NOWAIT)) {
device_printf(sc->dev, "Can't load rbuf.\n");
return (ENXIO);
}
diff --git a/sys/dev/sound/pci/maestro.c b/sys/dev/sound/pci/maestro.c
index ed1c9ef1cad6..3caccdb12fe9 100644
--- a/sys/dev/sound/pci/maestro.c
+++ b/sys/dev/sound/pci/maestro.c
@@ -1716,8 +1716,8 @@ dma_malloc(bus_dma_tag_t dmat, u_int32_t sz, bus_addr_t *phys,
if (bus_dmamem_alloc(dmat, &buf, BUS_DMA_NOWAIT, map))
return NULL;
- if (bus_dmamap_load(dmat, *map, buf, sz, setmap, phys, 0) != 0 ||
- *phys == 0) {
+ if (bus_dmamap_load(dmat, *map, buf, sz, setmap, phys,
+ BUS_DMA_NOWAIT) != 0 || *phys == 0) {
bus_dmamem_free(dmat, buf, *map);
return NULL;
}
@@ -1793,7 +1793,7 @@ agg_attach(device_t dev)
/*filter*/ NULL, NULL,
/*size */ ess->bufsz, 1, 0x3ffff,
/*flags */ 0,
- /*lock */ busdma_lock_mutex, &Giant,
+ /*lock */ NULL, NULL,
&ess->buf_dmat) != 0) {
device_printf(dev, "unable to create dma tag\n");
ret = ENOMEM;
@@ -1807,7 +1807,7 @@ agg_attach(device_t dev)
/*filter*/ NULL, NULL,
/*size */ 3*ess->bufsz, 1, 0x3ffff,
/*flags */ 0,
- /*lock */ busdma_lock_mutex, &Giant,
+ /*lock */ NULL, NULL,
&ess->stat_dmat) != 0) {
device_printf(dev, "unable to create dma tag\n");
ret = ENOMEM;
diff --git a/sys/dev/sound/pci/solo.c b/sys/dev/sound/pci/solo.c
index 6d5b833264d6..7132a7f34dee 100644
--- a/sys/dev/sound/pci/solo.c
+++ b/sys/dev/sound/pci/solo.c
@@ -50,9 +50,6 @@ SND_DECLARE_FILE("$FreeBSD$");
/* more accurate clocks and split audio1/audio2 rates */
#define ESS18XX_NEWSPEED
-/* 1 = INTR_MPSAFE, 0 = GIANT */
-#define ESS18XX_MPSAFE 1
-
static u_int32_t ess_playfmt[] = {
SND_FORMAT(AFMT_U8, 1, 0),
SND_FORMAT(AFMT_U8, 2, 0),
@@ -103,20 +100,12 @@ struct ess_info {
unsigned int bufsz;
struct ess_chinfo pch, rch;
-#if ESS18XX_MPSAFE == 1
struct mtx *lock;
-#endif
};
-#if ESS18XX_MPSAFE == 1
#define ess_lock(_ess) snd_mtxlock((_ess)->lock)
#define ess_unlock(_ess) snd_mtxunlock((_ess)->lock)
#define ess_lock_assert(_ess) snd_mtxassert((_ess)->lock)
-#else
-#define ess_lock(_ess)
-#define ess_unlock(_ess)
-#define ess_lock_assert(_ess)
-#endif
static int ess_rd(struct ess_info *sc, int reg);
static void ess_wr(struct ess_info *sc, int reg, u_int8_t val);
@@ -868,12 +857,10 @@ ess_release_resources(struct ess_info *sc, device_t dev)
sc->parent_dmat = 0;
}
-#if ESS18XX_MPSAFE == 1
if (sc->lock) {
snd_mtxfree(sc->lock);
sc->lock = NULL;
}
-#endif
free(sc, M_DEVBUF);
}
@@ -902,14 +889,10 @@ ess_alloc_resources(struct ess_info *sc, device_t dev)
sc->irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
RF_ACTIVE | RF_SHAREABLE);
-#if ESS18XX_MPSAFE == 1
sc->lock = snd_mtxcreate(device_get_nameunit(dev), "snd_solo softc");
return (sc->irq && sc->io && sc->sb && sc->vc &&
sc->mpu && sc->gp && sc->lock)? 0 : ENXIO;
-#else
- return (sc->irq && sc->io && sc->sb && sc->vc && sc->mpu && sc->gp)? 0 : ENXIO;
-#endif
}
static int
@@ -1008,13 +991,7 @@ ess_attach(device_t dev)
#else
sc->newspeed = 0;
#endif
- if (snd_setup_intr(dev, sc->irq,
-#if ESS18XX_MPSAFE == 1
- INTR_MPSAFE
-#else
- 0
-#endif
- , ess_intr, sc, &sc->ih)) {
+ if (snd_setup_intr(dev, sc->irq, INTR_MPSAFE, ess_intr, sc, &sc->ih)) {
device_printf(dev, "unable to map interrupt\n");
goto no;
}
@@ -1032,11 +1009,7 @@ ess_attach(device_t dev)
/*maxsize*/sc->bufsz, /*nsegments*/1,
/*maxsegz*/0x3ffff,
/*flags*/0,
-#if ESS18XX_MPSAFE == 1
/*lockfunc*/NULL, /*lockarg*/NULL,
-#else
- /*lockfunc*/busdma_lock_mutex, /*lockarg*/&Giant,
-#endif
&sc->parent_dmat) != 0) {
device_printf(dev, "unable to create dma tag\n");
goto no;
diff --git a/sys/dev/sound/pci/t4dwave.c b/sys/dev/sound/pci/t4dwave.c
index 08edb53b11a0..b30d269f5eef 100644
--- a/sys/dev/sound/pci/t4dwave.c
+++ b/sys/dev/sound/pci/t4dwave.c
@@ -913,8 +913,8 @@ tr_pci_attach(device_t dev)
/*highaddr*/BUS_SPACE_MAXADDR,
/*filter*/NULL, /*filterarg*/NULL,
/*maxsize*/tr->bufsz, /*nsegments*/1, /*maxsegz*/tr->bufsz,
- /*flags*/0, /*lockfunc*/busdma_lock_mutex,
- /*lockarg*/&Giant, &tr->parent_dmat) != 0) {
+ /*flags*/0, /*lockfunc*/NULL, /*lockarg*/NULL,
+ &tr->parent_dmat) != 0) {
device_printf(dev, "unable to create dma tag\n");
goto bad;
}
diff --git a/sys/dev/sound/pci/vibes.c b/sys/dev/sound/pci/vibes.c
index a46efb061a8f..931de7300a3b 100644
--- a/sys/dev/sound/pci/vibes.c
+++ b/sys/dev/sound/pci/vibes.c
@@ -776,8 +776,8 @@ sv_attach(device_t dev) {
/*filter*/NULL, /*filterarg*/NULL,
/*maxsize*/sc->bufsz, /*nsegments*/1,
/*maxsegz*/0x3ffff, /*flags*/0,
- /*lockfunc*/busdma_lock_mutex,
- /*lockarg*/&Giant, &sc->parent_dmat) != 0) {
+ /*lockfunc*/NULL, /*lockarg*/NULL,
+ &sc->parent_dmat) != 0) {
device_printf(dev, "sv_attach: Unable to create dma tag\n");
goto fail;
}
diff --git a/sys/dev/sound/pcm/buffer.c b/sys/dev/sound/pcm/buffer.c
index b86b67e44344..14fc098d6b33 100644
--- a/sys/dev/sound/pcm/buffer.c
+++ b/sys/dev/sound/pcm/buffer.c
@@ -107,7 +107,7 @@ sndbuf_alloc(struct snd_dbuf *b, bus_dma_tag_t dmatag, int dmaflags,
return (ENOMEM);
}
if (bus_dmamap_load(b->dmatag, b->dmamap, b->buf, b->maxsize,
- sndbuf_setmap, b, 0) != 0 || b->buf_addr == 0) {
+ sndbuf_setmap, b, BUS_DMA_NOWAIT) != 0 || b->buf_addr == 0) {
sndbuf_free(b);
return (ENOMEM);
}
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