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dmaengine: dw: went back to plain {request,free}_irq() calls 

The commit dbde5c29 "dw_dmac: use devm_* functions to simplify code" turns
probe function to use devm_* helpers and simultaneously brings a regression. We
need to ensure irq is disabled, followed by ensuring that don't schedule any
more tasklets and then its safe to use tasklet_kill().

The free_irq() will ensure that the irq is disabled and also wait till all
scheduled interrupts are executed by invoking synchronize_irq(). So we need to
only do tasklet_kill() after invoking free_irq().

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: stable@vger.kernel.org # v3.11+
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
hifive-unleashed-5.1
Andy Shevchenko 2014-05-07 10:56:24 +03:00 committed by Vinod Koul
parent a798c10faf
commit 97977f7576
1 changed files with 6 additions and 5 deletions
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11
drivers/dma/dw/core.c
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@ -1548,11 +1548,6 @@ int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata)
/* Disable BLOCK interrupts as well */
channel_clear_bit(dw, MASK.BLOCK, dw->all_chan_mask);
err = devm_request_irq(chip->dev, chip->irq, dw_dma_interrupt,
IRQF_SHARED, "dw_dmac", dw);
if (err)
return err;
/* Create a pool of consistent memory blocks for hardware descriptors */
dw->desc_pool = dmam_pool_create("dw_dmac_desc_pool", chip->dev,
sizeof(struct dw_desc), 4, 0);
@ -1563,6 +1558,11 @@ int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata)
tasklet_init(&dw->tasklet, dw_dma_tasklet, (unsigned long)dw);
err = request_irq(chip->irq, dw_dma_interrupt, IRQF_SHARED,
"dw_dmac", dw);
if (err)
return err;
INIT_LIST_HEAD(&dw->dma.channels);
for (i = 0; i < nr_channels; i++) {
struct dw_dma_chan *dwc = &dw->chan[i];
@ -1667,6 +1667,7 @@ int dw_dma_remove(struct dw_dma_chip *chip)
dw_dma_off(dw);
dma_async_device_unregister(&dw->dma);
free_irq(chip->irq, dw);
tasklet_kill(&dw->tasklet);
list_for_each_entry_safe(dwc, _dwc, &dw->dma.channels,