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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>
This commit is contained in:
Alan Cox 2007-02-05 16:31:03 -08:00 committed by Jeff Garzik
parent 257b346d20
commit 45d3ac4ec3
1 changed files with 1 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/net/wan/z85230.c
View File

@ -331,8 +331,7 @@ static void z8530_rtsdtr(struct z8530_channel *c, int set)
static void z8530_rx(struct z8530_channel *c)
{
u8 ch,stat;
spin_lock(c->lock);
while(1)
{
/* FIFO empty ? */
@ -390,7 +389,6 @@ static void z8530_rx(struct z8530_channel *c)
*/
write_zsctrl(c, ERR_RES);
write_zsctrl(c, RES_H_IUS);
spin_unlock(c->lock);
}
@ -406,7 +404,6 @@ static void z8530_rx(struct z8530_channel *c)
static void z8530_tx(struct z8530_channel *c)
{
spin_lock(c->lock);
while(c->txcount) {
/* FIFO full ? */
if(!(read_zsreg(c, R0)&4))
@ -434,7 +431,6 @@ static void z8530_tx(struct z8530_channel *c)
z8530_tx_done(c);
write_zsctrl(c, RES_H_IUS);
spin_unlock(c->lock);
}
/**
@ -452,7 +448,6 @@ static void z8530_status(struct z8530_channel *chan)
{
u8 status, altered;
spin_lock(chan->lock);
status=read_zsreg(chan, R0);
altered=chan->status^status;
@ -487,7 +482,6 @@ static void z8530_status(struct z8530_channel *chan)
}
write_zsctrl(chan, RES_EXT_INT);
write_zsctrl(chan, RES_H_IUS);
spin_unlock(chan->lock);
}
struct z8530_irqhandler z8530_sync=
@ -511,7 +505,6 @@ EXPORT_SYMBOL(z8530_sync);
static void z8530_dma_rx(struct z8530_channel *chan)
{
spin_lock(chan->lock);
if(chan->rxdma_on)
{
/* Special condition check only */
@ -534,7 +527,6 @@ static void z8530_dma_rx(struct z8530_channel *chan)
/* DMA is off right now, drain the slow way */
z8530_rx(chan);
}
spin_unlock(chan->lock);
}
/**
@ -547,7 +539,6 @@ static void z8530_dma_rx(struct z8530_channel *chan)
static void z8530_dma_tx(struct z8530_channel *chan)
{
spin_lock(chan->lock);
if(!chan->dma_tx)
{
printk(KERN_WARNING "Hey who turned the DMA off?\n");
@ -557,7 +548,6 @@ static void z8530_dma_tx(struct z8530_channel *chan)
/* This shouldnt occur in DMA mode */
printk(KERN_ERR "DMA tx - bogus event!\n");
z8530_tx(chan);
spin_unlock(chan->lock);
}
/**
@ -596,7 +586,6 @@ static void z8530_dma_status(struct z8530_channel *chan)
}
}
spin_lock(chan->lock);
if(altered&chan->dcdcheck)
{
if(status&chan->dcdcheck)
@ -618,7 +607,6 @@ static void z8530_dma_status(struct z8530_channel *chan)
write_zsctrl(chan, RES_EXT_INT);
write_zsctrl(chan, RES_H_IUS);
spin_unlock(chan->lock);
}
struct z8530_irqhandler z8530_dma_sync=