From bad83565eafe8a00922ad4eed6920625a10a2126 Mon Sep 17 00:00:00 2001 From: Peter Ujfalusi Date: Fri, 31 Jan 2020 11:38:58 +0200 Subject: [PATCH] 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 Reviewed-by: Geert Uytterhoeven Link: https://lore.kernel.org/r/20200131093859.3311-2-peter.ujfalusi@ti.com Signed-off-by: Vinod Koul --- drivers/dma/dmaengine.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c index 3432dac..c3b1283 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); -- 2.7.4