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Blackfin SPI Driver: add timeout while waiting for SPIF in dma irq handler 

The "while" endless loop will cause the system hang if hardware error, so
we add timeout control to make the system alive.

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mike Frysinger 2009-04-06 19:00:42 -07:00 committed by Linus Torvalds
parent 11d6f59951
commit aaaf939c57
1 changed files with 11 additions and 1 deletions
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12
drivers/spi/spi_bfin5xx.c
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@ -557,6 +557,7 @@ static irqreturn_t dma_irq_handler(int irq, void *dev_id)
struct driver_data *drv_data = dev_id;
struct chip_data *chip = drv_data->cur_chip;
struct spi_message *msg = drv_data->cur_msg;
unsigned long timeout;
unsigned short dmastat = get_dma_curr_irqstat(drv_data->dma_channel);
u16 spistat = read_STAT(drv_data);
@ -582,8 +583,17 @@ static irqreturn_t dma_irq_handler(int irq, void *dev_id)
cpu_relax();
}
dev_dbg(&drv_data->pdev->dev,
"in dma_irq_handler dmastat:0x%x spistat:0x%x\n",
dmastat, read_STAT(drv_data));
timeout = jiffies + HZ;
while (!(read_STAT(drv_data) & SPIF))
cpu_relax();
if (!time_before(jiffies, timeout)) {
dev_warn(&drv_data->pdev->dev, "timeout waiting for SPIF");
break;
} else
cpu_relax();
if ((dmastat & DMA_ERR) && (spistat & RBSY)) {
msg->state = ERROR_STATE;