diff options
| author | Peter Ujfalusi <peter.ujfalusi@ti.com> | 2020-01-31 11:38:58 +0200 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2020-02-03 09:49:20 +0530 |
| commit | bad83565eafe8a00922ad4eed6920625a10a2126 (patch) | |
| tree | 0bb78155e54d75a298efd6d8641d27b1b33d71a3 /drivers | |
| parent | 5429b51f606cb82f315f68678b959112766f235e (diff) | |
| download | linux-bad83565eafe8a00922ad4eed6920625a10a2126.tar.bz2 | |
dmaengine: Cleanups for the slave <-> channel symlink support
No need to use goto to jump over the
return chan ? chan : ERR_PTR(-EPROBE_DEFER);
We can just revert the check and return right there.
Do not fail the channel request if the chan->name allocation fails, but
print a warning about it.
Change the dev_err to dev_warn if sysfs_create_link() fails as it is not
fatal.
Only attempt to remove the DMA_SLAVE_NAME symlink if it is created - or it
was attempted to be created.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20200131093859.3311-2-peter.ujfalusi@ti.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/dma/dmaengine.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c index 3432dac695e5..c3b1283b6d31 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -756,22 +756,21 @@ struct dma_chan *dma_request_chan(struct device *dev, const char *name) } mutex_unlock(&dma_list_mutex); - if (!IS_ERR_OR_NULL(chan)) - goto found; - - return chan ? chan : ERR_PTR(-EPROBE_DEFER); + if (IS_ERR_OR_NULL(chan)) + return chan ? chan : ERR_PTR(-EPROBE_DEFER); found: - chan->slave = dev; chan->name = kasprintf(GFP_KERNEL, "dma:%s", name); if (!chan->name) - return ERR_PTR(-ENOMEM); + return chan; + chan->slave = dev; if (sysfs_create_link(&chan->dev->device.kobj, &dev->kobj, DMA_SLAVE_NAME)) - dev_err(dev, "Cannot create DMA %s symlink\n", DMA_SLAVE_NAME); + dev_warn(dev, "Cannot create DMA %s symlink\n", DMA_SLAVE_NAME); if (sysfs_create_link(&dev->kobj, &chan->dev->device.kobj, chan->name)) - dev_err(dev, "Cannot create DMA %s symlink\n", chan->name); + dev_warn(dev, "Cannot create DMA %s symlink\n", chan->name); + return chan; } EXPORT_SYMBOL_GPL(dma_request_chan); @@ -830,13 +829,14 @@ void dma_release_channel(struct dma_chan *chan) /* drop PRIVATE cap enabled by __dma_request_channel() */ if (--chan->device->privatecnt == 0) dma_cap_clear(DMA_PRIVATE, chan->device->cap_mask); + if (chan->slave) { + sysfs_remove_link(&chan->dev->device.kobj, DMA_SLAVE_NAME); sysfs_remove_link(&chan->slave->kobj, chan->name); kfree(chan->name); chan->name = NULL; chan->slave = NULL; } - sysfs_remove_link(&chan->dev->device.kobj, DMA_SLAVE_NAME); mutex_unlock(&dma_list_mutex); } EXPORT_SYMBOL_GPL(dma_release_channel); |