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authorPaul Cercueil <paul@crapouillou.net>2020-05-24 21:50:48 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-05-25 13:36:30 +0200
commit685f5f24108a5f3481da70ee75a1b18b9de34257 (patch)
treea1bcef332ee55714b68f6b6f2f42671447646530 /drivers/usb/musb/jz4740.c
parent402bcac4b25b520c89ba60db85eb6316f36e797f (diff)
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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: 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>
Diffstat (limited to 'drivers/usb/musb/jz4740.c')
-rw-r--r--drivers/usb/musb/jz4740.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/usb/musb/jz4740.c b/drivers/usb/musb/jz4740.c
index e64dd30e80e7..c4fe1f4cd17a 100644
--- a/drivers/usb/musb/jz4740.c
+++ b/drivers/usb/musb/jz4740.c
@@ -30,11 +30,11 @@ static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci)
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);