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z85230: spinlock logic
At some point someone added a spin_lock(&dev->lock) to the IRQ handler for the Z85230 driver. This actually correctly fixes a bug but the necessary changes to remove the chan->lock calls in the event handlers were not made (c->lock is the same lock). Simona Dascenzo reported the problem with the driver and this patch should fix the problem he found. Cc: "David S. Miller" <davem@davemloft.net> Cc: Jeff Garzik <jeff@garzik.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jeff Garzik <jeff@garzik.org>
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parent
257b346d20
commit
45d3ac4ec3
1 changed files with 1 additions and 13 deletions
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@ -331,7 +331,6 @@ static void z8530_rtsdtr(struct z8530_channel *c, int set)
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static void z8530_rx(struct z8530_channel *c)
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{
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u8 ch,stat;
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spin_lock(c->lock);
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while(1)
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{
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@ -390,7 +389,6 @@ static void z8530_rx(struct z8530_channel *c)
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*/
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write_zsctrl(c, ERR_RES);
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write_zsctrl(c, RES_H_IUS);
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spin_unlock(c->lock);
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}
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@ -406,7 +404,6 @@ static void z8530_rx(struct z8530_channel *c)
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static void z8530_tx(struct z8530_channel *c)
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{
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spin_lock(c->lock);
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while(c->txcount) {
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/* FIFO full ? */
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if(!(read_zsreg(c, R0)&4))
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@ -434,7 +431,6 @@ static void z8530_tx(struct z8530_channel *c)
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z8530_tx_done(c);
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write_zsctrl(c, RES_H_IUS);
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spin_unlock(c->lock);
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}
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/**
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@ -452,7 +448,6 @@ static void z8530_status(struct z8530_channel *chan)
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{
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u8 status, altered;
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spin_lock(chan->lock);
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status=read_zsreg(chan, R0);
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altered=chan->status^status;
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@ -487,7 +482,6 @@ static void z8530_status(struct z8530_channel *chan)
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}
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write_zsctrl(chan, RES_EXT_INT);
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write_zsctrl(chan, RES_H_IUS);
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spin_unlock(chan->lock);
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}
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struct z8530_irqhandler z8530_sync=
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@ -511,7 +505,6 @@ EXPORT_SYMBOL(z8530_sync);
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static void z8530_dma_rx(struct z8530_channel *chan)
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{
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spin_lock(chan->lock);
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if(chan->rxdma_on)
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{
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/* Special condition check only */
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@ -534,7 +527,6 @@ static void z8530_dma_rx(struct z8530_channel *chan)
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/* DMA is off right now, drain the slow way */
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z8530_rx(chan);
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}
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spin_unlock(chan->lock);
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}
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/**
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@ -547,7 +539,6 @@ static void z8530_dma_rx(struct z8530_channel *chan)
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static void z8530_dma_tx(struct z8530_channel *chan)
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{
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spin_lock(chan->lock);
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if(!chan->dma_tx)
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{
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printk(KERN_WARNING "Hey who turned the DMA off?\n");
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@ -557,7 +548,6 @@ static void z8530_dma_tx(struct z8530_channel *chan)
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/* This shouldnt occur in DMA mode */
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printk(KERN_ERR "DMA tx - bogus event!\n");
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z8530_tx(chan);
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spin_unlock(chan->lock);
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}
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/**
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@ -596,7 +586,6 @@ static void z8530_dma_status(struct z8530_channel *chan)
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}
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}
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spin_lock(chan->lock);
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if(altered&chan->dcdcheck)
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{
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if(status&chan->dcdcheck)
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@ -618,7 +607,6 @@ static void z8530_dma_status(struct z8530_channel *chan)
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write_zsctrl(chan, RES_EXT_INT);
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write_zsctrl(chan, RES_H_IUS);
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spin_unlock(chan->lock);
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}
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struct z8530_irqhandler z8530_dma_sync=
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