From: Paul Cercueil paul@crapouillou.net
commit 685f5f24108a5f3481da70ee75a1b18b9de34257 upstream.
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: 57aadb46bd63 ("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
--- drivers/usb/musb/jz4740.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/usb/musb/jz4740.c +++ b/drivers/usb/musb/jz4740.c @@ -30,11 +30,11 @@ static irqreturn_t jz4740_musb_interrupt irqreturn_t retval = IRQ_NONE, retval_dma = IRQ_NONE; struct musb *musb = __hci;
- spin_lock_irqsave(&musb->lock, flags); - if (IS_ENABLED(CONFIG_USB_INVENTRA_DMA) && musb->dma_controller) retval_dma = dma_controller_irq(irq, musb->dma_controller);
+ spin_lock_irqsave(&musb->lock, flags); + musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB); musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX); musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);