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| author | Guennadi Liakhovetski <g.liakhovetski@gmx.de> | 2011-05-02 09:59:02 +0200 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2011-05-23 05:49:59 +0200 |
| commit | 31705e21f9b5a0628c043f88ff4d20488b47b8ab (patch) | |
| tree | 220d1a8c0a83fec0450b7944d1af94ff9902b77f /drivers/dma/shdma.c | |
| parent | dmaengine: shdma: add runtime- and system-level power management (diff) | |
| download | linux-31705e21f9b5a0628c043f88ff4d20488b47b8ab.tar.xz linux-31705e21f9b5a0628c043f88ff4d20488b47b8ab.zip | |
dmaengine: shdma: synchronize RCU before freeing, simplify spinlock
List elements, deleted using list_del_rcu(), cannot be freed without
synchronising RCU. Further, the spinlock, used to protect the RCU
writer, is called in process context, so, we don't have to save flags.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'drivers/dma/shdma.c')
| -rw-r--r-- | drivers/dma/shdma.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/drivers/dma/shdma.c b/drivers/dma/shdma.c index 00b5f320b0e8..dcc1b2139fff 100644 --- a/drivers/dma/shdma.c +++ b/drivers/dma/shdma.c @@ -1077,7 +1077,6 @@ static int __init sh_dmae_probe(struct platform_device *pdev) struct sh_dmae_pdata *pdata = pdev->dev.platform_data; unsigned long irqflags = IRQF_DISABLED, chan_flag[SH_DMAC_MAX_CHANNELS] = {}; - unsigned long flags; int errirq, chan_irq[SH_DMAC_MAX_CHANNELS]; int err, i, irq_cnt = 0, irqres = 0; struct sh_dmae_device *shdev; @@ -1143,9 +1142,9 @@ static int __init sh_dmae_probe(struct platform_device *pdev) pm_runtime_enable(&pdev->dev); pm_runtime_get_sync(&pdev->dev); - spin_lock_irqsave(&sh_dmae_lock, flags); + spin_lock_irq(&sh_dmae_lock); list_add_tail_rcu(&shdev->node, &sh_dmae_devices); - spin_unlock_irqrestore(&sh_dmae_lock, flags); + spin_unlock_irq(&sh_dmae_lock); /* reset dma controller - only needed as a test */ err = sh_dmae_rst(shdev); @@ -1250,9 +1249,9 @@ eirqres: eirq_err: #endif rst_err: - spin_lock_irqsave(&sh_dmae_lock, flags); + spin_lock_irq(&sh_dmae_lock); list_del_rcu(&shdev->node); - spin_unlock_irqrestore(&sh_dmae_lock, flags); + spin_unlock_irq(&sh_dmae_lock); pm_runtime_put(&pdev->dev); pm_runtime_disable(&pdev->dev); @@ -1261,6 +1260,7 @@ rst_err: iounmap(shdev->dmars); emapdmars: iounmap(shdev->chan_reg); + synchronize_rcu(); emapchan: kfree(shdev); ealloc: @@ -1276,7 +1276,6 @@ static int __exit sh_dmae_remove(struct platform_device *pdev) { struct sh_dmae_device *shdev = platform_get_drvdata(pdev); struct resource *res; - unsigned long flags; int errirq = platform_get_irq(pdev, 0); dma_async_device_unregister(&shdev->common); @@ -1284,9 +1283,9 @@ static int __exit sh_dmae_remove(struct platform_device *pdev) if (errirq > 0) free_irq(errirq, shdev); - spin_lock_irqsave(&sh_dmae_lock, flags); + spin_lock_irq(&sh_dmae_lock); list_del_rcu(&shdev->node); - spin_unlock_irqrestore(&sh_dmae_lock, flags); + spin_unlock_irq(&sh_dmae_lock); /* channel data remove */ sh_dmae_chan_remove(shdev); @@ -1297,6 +1296,7 @@ static int __exit sh_dmae_remove(struct platform_device *pdev) iounmap(shdev->dmars); iounmap(shdev->chan_reg); + synchronize_rcu(); kfree(shdev); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |