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| author | Lukas Wunner <lukas@wunner.de> | 2019-01-23 09:26:00 +0100 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2019-02-04 12:41:32 +0530 |
| commit | efdffc1aaf1a6710f350d9c4e2573fcc8d43f8f1 (patch) | |
| tree | 8a6efc2869bc984bfc11600226d65cd5af95d316 /drivers/dma | |
| parent | 603fe86be189e1485715c6cc70113b43a8553da3 (diff) | |
| download | lwn-efdffc1aaf1a6710f350d9c4e2573fcc8d43f8f1.tar.gz lwn-efdffc1aaf1a6710f350d9c4e2573fcc8d43f8f1.zip | |
dmaengine: bcm2835: Drop gratuitous list deletion
The BCM2835 DMA driver deletes a channel from a list upon termination
without having added it to a list first. Moreover that operation is
protected by a spinlock which isn't taken anywhere else. These appear
to be remnants of an older version of the driver which accidentally
got mainlined. Remove the dead code.
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: Frank Pavlic <f.pavlic@kunbus.de>
Cc: Martin Sperl <kernel@martin.sperl.org>
Cc: Florian Meier <florian.meier@koalo.de>
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Acked-by: Florian Kauer <florian.kauer@koalo.de>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/bcm2835-dma.c | 10 |
1 files changed, 0 insertions, 10 deletions
diff --git a/drivers/dma/bcm2835-dma.c b/drivers/dma/bcm2835-dma.c index 6d66e233a191..138bda32b266 100644 --- a/drivers/dma/bcm2835-dma.c +++ b/drivers/dma/bcm2835-dma.c @@ -42,7 +42,6 @@ struct bcm2835_dmadev { struct dma_device ddev; - spinlock_t lock; void __iomem *base; struct device_dma_parameters dma_parms; }; @@ -64,7 +63,6 @@ struct bcm2835_cb_entry { struct bcm2835_chan { struct virt_dma_chan vc; - struct list_head node; struct dma_slave_config cfg; unsigned int dreq; @@ -777,17 +775,11 @@ static int bcm2835_dma_slave_config(struct dma_chan *chan, static int bcm2835_dma_terminate_all(struct dma_chan *chan) { struct bcm2835_chan *c = to_bcm2835_dma_chan(chan); - struct bcm2835_dmadev *d = to_bcm2835_dma_dev(c->vc.chan.device); unsigned long flags; LIST_HEAD(head); spin_lock_irqsave(&c->vc.lock, flags); - /* Prevent this channel being scheduled */ - spin_lock(&d->lock); - list_del_init(&c->node); - spin_unlock(&d->lock); - /* stop DMA activity */ if (c->desc) { vchan_terminate_vdesc(&c->desc->vd); @@ -820,7 +812,6 @@ static int bcm2835_dma_chan_init(struct bcm2835_dmadev *d, int chan_id, c->vc.desc_free = bcm2835_dma_desc_free; vchan_init(&c->vc, &d->ddev); - INIT_LIST_HEAD(&c->node); c->chan_base = BCM2835_DMA_CHANIO(d->base, chan_id); c->ch = chan_id; @@ -923,7 +914,6 @@ static int bcm2835_dma_probe(struct platform_device *pdev) od->ddev.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; od->ddev.dev = &pdev->dev; INIT_LIST_HEAD(&od->ddev.channels); - spin_lock_init(&od->lock); platform_set_drvdata(pdev, od); |