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USB: musb: fix for crash in DM646x USB when (CPPI)DMA is enabled

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Race condition exists between the cppi_interrupt handler and
davinci_interrupt handler w.r.t completing a TX IO.  Since DM646x
has seperate DMA and USB endpoint interrupts cppi_interrupt handler
needs to hold the lock while operating on the endpoint.

Update over previous patch to avoid taking the lock if already
taken.  Tested on DM644x, DM355 and DM646x platforms.

Signed-off-by: Swaminathan S <swami.iyer@ti.com>
Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Acked-by: Anand Gadiyar <gadiyar@ti.com>
Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Swaminathan S 2009-12-15 13:30:00 +02:00 committed by Greg Kroah-Hartman
parent cd42fef0a0
commit 93aa3dab00
1 changed files with 6 additions and 0 deletions
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6
drivers/usb/musb/cppi_dma.c
View file

@ -1154,8 +1154,11 @@ irqreturn_t cppi_interrupt(int irq, void *dev_id)
struct musb_hw_ep *hw_ep = NULL;
u32 rx, tx;
int i, index;
unsigned long flags;
cppi = container_of(musb->dma_controller, struct cppi, controller);
if (cppi->irq)
spin_lock_irqsave(&musb->lock, flags);
tibase = musb->ctrl_base;
@ -1285,6 +1288,9 @@ irqreturn_t cppi_interrupt(int irq, void *dev_id)
/* write to CPPI EOI register to re-enable interrupts */
musb_writel(tibase, DAVINCI_CPPI_EOI_REG, 0);
if (cppi->irq)
spin_unlock_irqrestore(&musb->lock, flags);
return IRQ_HANDLED;
}