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dmaengine: bcm2835: Drop gratuitous list deletion

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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>
This commit is contained in:
Lukas Wunner 2019-01-23 09:26:00 +01:00 committed by Vinod Koul
parent 603fe86be1
commit efdffc1aaf
1 changed files with 0 additions and 10 deletions
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10
drivers/dma/bcm2835-dma.c
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@ -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);