DepSurf

Function: `dma_release_channel`

Status

Regular

In 4.4: ✅

void dma_release_channel(struct dma_chan *chan);

Collision: Unique Global

Inline: No

Transformation: False

Instances:

In drivers/dma/dmaengine.c (ffffffff814bd510)
Location: drivers/dma/dmaengine.c:708
Inline: False
Direct callers:
  - drivers/rapidio/rio.c:rio_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma

Symbols:

ffffffff814bd510-ffffffff814bd583: dma_release_channel (STB_GLOBAL)

In 4.8: ✅

void dma_release_channel(struct dma_chan *chan);

Collision: Unique Global

Inline: No

Transformation: False

Instances:

In drivers/dma/dmaengine.c (ffffffff8150d6b0)
Location: drivers/dma/dmaengine.c:784
Inline: False
Direct callers:
  - drivers/rapidio/rio.c:rio_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma

Symbols:

ffffffff8150d6b0-ffffffff8150d723: dma_release_channel (STB_GLOBAL)

In 4.10: ✅

void dma_release_channel(struct dma_chan *chan);

Collision: Unique Global

Inline: No

Transformation: False

Instances:

In drivers/dma/dmaengine.c (ffffffff815397e0)
Location: drivers/dma/dmaengine.c:784
Inline: False
Direct callers:
  - drivers/rapidio/rio.c:rio_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma

Symbols:

ffffffff815397e0-ffffffff81539853: dma_release_channel (STB_GLOBAL)

In 4.13: ✅

void dma_release_channel(struct dma_chan *chan);

Collision: Unique Global

Inline: No

Transformation: False

Instances:

In drivers/dma/dmaengine.c (ffffffff8154d040)
Location: drivers/dma/dmaengine.c:784
Inline: False
Direct callers:
  - drivers/rapidio/rio.c:rio_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma

Symbols:

ffffffff8154d040-ffffffff8154d0a9: dma_release_channel (STB_GLOBAL)

In 4.15: ✅

void dma_release_channel(struct dma_chan *chan);

Collision: Unique Global

Inline: No

Transformation: False

Instances:

In drivers/dma/dmaengine.c (ffffffff815b05b0)
Location: drivers/dma/dmaengine.c:784
Inline: False
Direct callers:
  - drivers/rapidio/rio.c:rio_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma

Symbols:

ffffffff815b05b0-ffffffff815b0619: dma_release_channel (STB_GLOBAL)

In 4.18: ✅

void dma_release_channel(struct dma_chan *chan);

Collision: Unique Global

Inline: No

Transformation: False

Instances:

In drivers/dma/dmaengine.c (ffffffff815e8a00)
Location: drivers/dma/dmaengine.c:784
Inline: False
Direct callers:
  - drivers/rapidio/rio.c:rio_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma

Symbols:

ffffffff815e8a00-ffffffff815e8a69: dma_release_channel (STB_GLOBAL)

In 5.0: ✅

void dma_release_channel(struct dma_chan *chan);

Collision: Unique Global

Inline: No

Transformation: False

Instances:

In drivers/dma/dmaengine.c (ffffffff816027b0)
Location: drivers/dma/dmaengine.c:784
Inline: False
Direct callers:
  - drivers/rapidio/rio.c:rio_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma

Symbols:

ffffffff816027b0-ffffffff81602819: dma_release_channel (STB_GLOBAL)

In 5.3: ✅

void dma_release_channel(struct dma_chan *chan);

Collision: Unique Global

Inline: No

Transformation: False

Instances:

In drivers/dma/dmaengine.c (ffffffff81635d80)
Location: drivers/dma/dmaengine.c:780
Inline: False
Direct callers:
  - drivers/rapidio/rio.c:rio_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma

Symbols:

ffffffff81635d80-ffffffff81635df8: dma_release_channel (STB_GLOBAL)

In 5.4: ✅

void dma_release_channel(struct dma_chan *chan);

Collision: Unique Global

Inline: No

Transformation: False

Instances:

In drivers/dma/dmaengine.c (ffffffff81657aa0)
Location: drivers/dma/dmaengine.c:780
Inline: False
Direct callers:
  - drivers/rapidio/rio.c:rio_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma

Symbols:

ffffffff81657aa0-ffffffff81657b18: dma_release_channel (STB_GLOBAL)

In 5.8: ✅

void dma_release_channel(struct dma_chan *chan);

Collision: Unique Global

Inline: No

Transformation: False

Instances:

In drivers/dma/dmaengine.c (ffffffff81707650)
Location: drivers/dma/dmaengine.c:907
Inline: False
Direct callers:
  - drivers/rapidio/rio.c:rio_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma

Symbols:

ffffffff81707650-ffffffff81707717: dma_release_channel (STB_GLOBAL)

In 5.11: ✅

void dma_release_channel(struct dma_chan *chan);

Collision: Unique Global

Inline: No

Transformation: False

Instances:

In drivers/dma/dmaengine.c (ffffffff817248a0)
Location: drivers/dma/dmaengine.c:903
Inline: False
Direct callers:
  - drivers/rapidio/rio.c:rio_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma

Symbols:

ffffffff817248a0-ffffffff81724967: dma_release_channel (STB_GLOBAL)

In 5.13: ✅

void dma_release_channel(struct dma_chan *chan);

Collision: Unique Global

Inline: No

Transformation: False

Instances:

In drivers/dma/dmaengine.c (ffffffff81705b60)
Location: drivers/dma/dmaengine.c:903
Inline: False
Direct callers:
  - drivers/rapidio/rio.c:rio_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma

Symbols:

ffffffff81705b60-ffffffff81705c2e: dma_release_channel (STB_GLOBAL)

In 5.15: Transformation ⚠️

void dma_release_channel(struct dma_chan *chan);

Collision: Unique Global

Inline: No

Transformation: True

Instances:

In drivers/dma/dmaengine.c (0)
Location: drivers/dma/dmaengine.c:903
Inline: False
Direct callers:
  - drivers/rapidio/rio.c:rio_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma

Symbols:

ffffffff81cf3e26-ffffffff81cf3e3b: dma_release_channel.cold (STB_LOCAL)
ffffffff817814e0-ffffffff817815bf: dma_release_channel (STB_GLOBAL)

In 5.19: Transformation ⚠️

void dma_release_channel(struct dma_chan *chan);

Collision: Unique Global

Inline: No

Transformation: True

Instances:

In drivers/dma/dmaengine.c (0)
Location: drivers/dma/dmaengine.c:902
Inline: False
Direct callers:
  - drivers/rapidio/rio.c:rio_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma

Symbols:

ffffffff81ebbfe5-ffffffff81ebbffa: dma_release_channel.cold (STB_LOCAL)
ffffffff818b7e80-ffffffff818b7f69: dma_release_channel (STB_GLOBAL)

In 6.2: Transformation ⚠️

void dma_release_channel(struct dma_chan *chan);

Collision: Unique Global

Inline: No

Transformation: True

Instances:

In drivers/dma/dmaengine.c (0)
Location: drivers/dma/dmaengine.c:903
Inline: False
Direct callers:
  - drivers/rapidio/rio.c:rio_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma

Symbols:

ffffffff820937b8-ffffffff820937cd: dma_release_channel.cold (STB_LOCAL)
ffffffff81a05140-ffffffff81a05229: dma_release_channel (STB_GLOBAL)

In 6.5: Transformation ⚠️

void dma_release_channel(struct dma_chan *chan);

Collision: Unique Global

Inline: No

Transformation: True

Instances:

In drivers/dma/dmaengine.c (0)
Location: drivers/dma/dmaengine.c:903
Inline: False
Direct callers:
  - drivers/rapidio/rio.c:rio_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma

Symbols:

ffffffff821144c4-ffffffff821144d9: dma_release_channel.cold (STB_LOCAL)
ffffffff81a4dfa0-ffffffff81a4e089: dma_release_channel (STB_GLOBAL)

In 6.8: Transformation ⚠️

void dma_release_channel(struct dma_chan *chan);

Collision: Unique Global

Inline: No

Transformation: True

Instances:

In drivers/dma/dmaengine.c (0)
Location: drivers/dma/dmaengine.c:903
Inline: False
Direct callers:
  - drivers/rapidio/rio.c:rio_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma

Symbols:

ffffffff821f1eae-ffffffff821f1ec3: dma_release_channel.cold (STB_LOCAL)
ffffffff81a99c40-ffffffff81a99d29: dma_release_channel (STB_GLOBAL)

Arch

In arm64: ✅

void dma_release_channel(struct dma_chan *chan);

Collision: Unique Global

Inline: No

Transformation: False

Instances:

In drivers/dma/dmaengine.c (ffff8000107fd790)
Location: drivers/dma/dmaengine.c:780
Inline: False
Direct callers:
  - drivers/rapidio/rio.c:rio_release_dma
  - drivers/video/fbdev/mx3fb.c:mx3fb_remove
  - drivers/video/fbdev/mx3fb.c:mx3fb_probe
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma
  - drivers/tty/serial/amba-pl011.c:pl011_unregister_port
  - drivers/tty/serial/amba-pl011.c:pl011_unregister_port
  - drivers/tty/serial/amba-pl011.c:pl011_dma_probe
  - drivers/tty/serial/imx.c:imx_uart_dma_exit
  - drivers/tty/serial/imx.c:imx_uart_dma_exit
  - drivers/tty/serial/msm_serial.c:msm_startup
  - drivers/tty/serial/msm_serial.c:msm_startup
  - drivers/tty/serial/msm_serial.c:msm_release_dma
  - drivers/tty/serial/msm_serial.c:msm_release_dma
  - drivers/spi/spi-omap2-mcspi.c:omap2_mcspi_probe
  - drivers/spi/spi-omap2-mcspi.c:omap2_mcspi_release_dma
  - drivers/spi/spi-omap2-mcspi.c:omap2_mcspi_release_dma
  - drivers/mmc/host/mmci.c:mmci_dmae_release
  - drivers/mmc/host/mmci.c:mmci_dmae_release

Symbols:

ffff8000107fd790-ffff8000107fd86c: dma_release_channel (STB_GLOBAL)

In armhf: ✅

void dma_release_channel(struct dma_chan *chan);

Collision: Unique Global

Inline: No

Transformation: False

Instances:

In drivers/dma/dmaengine.c (c091df88)
Location: drivers/dma/dmaengine.c:780
Inline: False
Direct callers:
  - drivers/rapidio/rio.c:rio_release_dma
  - drivers/video/fbdev/mx3fb.c:mx3fb_remove
  - drivers/video/fbdev/mx3fb.c:mx3fb_probe
  - drivers/soc/tegra/fuse/fuse-tegra20.c:tegra20_fuse_probe
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma
  - drivers/tty/serial/amba-pl011.c:pl011_unregister_port
  - drivers/tty/serial/amba-pl011.c:pl011_unregister_port
  - drivers/tty/serial/amba-pl011.c:pl011_dma_probe
  - drivers/tty/serial/imx.c:imx_uart_dma_exit
  - drivers/tty/serial/imx.c:imx_uart_dma_exit
  - drivers/tty/serial/msm_serial.c:msm_startup
  - drivers/tty/serial/msm_serial.c:msm_startup
  - drivers/tty/serial/msm_serial.c:msm_release_dma
  - drivers/tty/serial/msm_serial.c:msm_release_dma
  - drivers/mtd/nand/raw/omap2.c:omap_nand_remove
  - drivers/mtd/nand/raw/omap2.c:omap_nand_probe
  - drivers/spi/spi-omap2-mcspi.c:omap2_mcspi_probe
  - drivers/spi/spi-omap2-mcspi.c:omap2_mcspi_release_dma
  - drivers/spi/spi-omap2-mcspi.c:omap2_mcspi_release_dma
  - drivers/i2c/busses/i2c-imx.c:i2c_imx_remove
  - drivers/i2c/busses/i2c-imx.c:i2c_imx_remove
  - drivers/i2c/busses/i2c-imx.c:i2c_imx_probe
  - drivers/i2c/busses/i2c-imx.c:i2c_imx_probe
  - drivers/mmc/host/mmci.c:mmci_dmae_release
  - drivers/mmc/host/mmci.c:mmci_dmae_release
  - drivers/mmc/host/omap_hsmmc.c:omap_hsmmc_remove
  - drivers/mmc/host/omap_hsmmc.c:omap_hsmmc_remove
  - drivers/mmc/host/omap_hsmmc.c:omap_hsmmc_probe
  - drivers/mmc/host/omap_hsmmc.c:omap_hsmmc_probe
  - sound/core/pcm_dmaengine.c:snd_dmaengine_pcm_close_release_chan
  - sound/soc/soc-generic-dmaengine-pcm.c:dmaengine_pcm_release_chan
  - sound/soc/soc-generic-dmaengine-pcm.c:dmaengine_pcm_release_chan

Symbols:

c091df88-c091e04c: dma_release_channel (STB_GLOBAL)

In ppc64el: ✅

void dma_release_channel(struct dma_chan *chan);

Collision: Unique Global

Inline: No

Transformation: False

Instances:

In drivers/dma/dmaengine.c (c0000000008c7ff0)
Location: drivers/dma/dmaengine.c:780
Inline: False
Direct callers:
  - drivers/rapidio/rio.c:rio_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma

Symbols:

c0000000008c7ff0-c0000000008c80d4: dma_release_channel (STB_GLOBAL)

In riscv64: ✅

void dma_release_channel(struct dma_chan *chan);

Collision: Unique Global

Inline: No

Transformation: False

Instances:

In drivers/dma/dmaengine.c (ffffffe000516c7a)
Location: drivers/dma/dmaengine.c:780
Inline: False
Direct callers:
  - drivers/rapidio/rio.c:rio_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma

Symbols:

ffffffe000516c7a-ffffffe000516d0c: dma_release_channel (STB_GLOBAL)

Flavor

In aws: ✅

void dma_release_channel(struct dma_chan *chan);

Collision: Unique Global

Inline: No

Transformation: False

Instances:

In drivers/dma/dmaengine.c (ffffffff8161d940)
Location: drivers/dma/dmaengine.c:780
Inline: False
Direct callers:
  - drivers/rapidio/rio.c:rio_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma

Symbols:

ffffffff8161d940-ffffffff8161d9b8: dma_release_channel (STB_GLOBAL)

In azure: ✅

void dma_release_channel(struct dma_chan *chan);

Collision: Unique Global

Inline: No

Transformation: False

Instances:

In drivers/dma/dmaengine.c (ffffffff81612030)
Location: drivers/dma/dmaengine.c:780
Inline: False
Direct callers:
  - drivers/rapidio/rio.c:rio_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma

Symbols:

ffffffff81612030-ffffffff816120a8: dma_release_channel (STB_GLOBAL)

In gcp: ✅

void dma_release_channel(struct dma_chan *chan);

Collision: Unique Global

Inline: No

Transformation: False

Instances:

In drivers/dma/dmaengine.c (ffffffff8164b8e0)
Location: drivers/dma/dmaengine.c:780
Inline: False
Direct callers:
  - drivers/rapidio/rio.c:rio_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma

Symbols:

ffffffff8164b8e0-ffffffff8164b958: dma_release_channel (STB_GLOBAL)

In lowlatency: ✅

void dma_release_channel(struct dma_chan *chan);

Collision: Unique Global

Inline: No

Transformation: False

Instances:

In drivers/dma/dmaengine.c (ffffffff81665e80)
Location: drivers/dma/dmaengine.c:780
Inline: False
Direct callers:
  - drivers/rapidio/rio.c:rio_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_release_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma
  - drivers/tty/serial/8250/8250_dma.c:serial8250_request_dma

Symbols:

ffffffff81665e80-ffffffff81665ef8: dma_release_channel (STB_GLOBAL)

Differences

Regular

No changes between 4.4 and 4.8 ✅
No changes between 4.8 and 4.10 ✅
No changes between 4.10 and 4.13 ✅
No changes between 4.13 and 4.15 ✅
No changes between 4.15 and 4.18 ✅
No changes between 4.18 and 5.0 ✅
No changes between 5.0 and 5.3 ✅
No changes between 5.3 and 5.4 ✅
No changes between 5.4 and 5.8 ✅
No changes between 5.8 and 5.11 ✅
No changes between 5.11 and 5.13 ✅
No changes between 5.13 and 5.15 ✅
No changes between 5.15 and 5.19 ✅
No changes between 5.19 and 6.2 ✅
No changes between 6.2 and 6.5 ✅
No changes between 6.5 and 6.8 ✅

Arch

No changes between amd64 and arm64 ✅
No changes between amd64 and armhf ✅
No changes between amd64 and ppc64el ✅
No changes between amd64 and riscv64 ✅

Flavor

No changes between generic and aws ✅
No changes between generic and azure ✅
No changes between generic and gcp ✅
No changes between generic and lowlatency ✅

DepSurf

Function: dma_release_channel

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Function: `dma_release_channel`