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usb: musb: jz4740: Prevent lockup when CONFIG_SMP is set
The function dma_controller_irq() locks up the exact same spinlock we
locked before calling it, which obviously resulted in a deadlock when
CONFIG_SMP was enabled. This flew under the radar as none of the boards
supported by this driver needs SMP.
Fixes: 57aadb46bd
("usb: musb: jz4740: Add support for DMA")
Cc: stable@vger.kernel.org
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Bin Liu <b-liu@ti.com>
Link: https://lore.kernel.org/r/20200525025049.3400-6-b-liu@ti.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
402bcac4b2
commit
685f5f2410
1 changed files with 2 additions and 2 deletions
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@ -30,11 +30,11 @@ static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci)
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irqreturn_t retval = IRQ_NONE, retval_dma = IRQ_NONE;
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struct musb *musb = __hci;
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spin_lock_irqsave(&musb->lock, flags);
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if (IS_ENABLED(CONFIG_USB_INVENTRA_DMA) && musb->dma_controller)
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retval_dma = dma_controller_irq(irq, musb->dma_controller);
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spin_lock_irqsave(&musb->lock, flags);
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musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
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musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
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musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
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