Re: [Xen-devel] [PATCH v3] xen/ns16550: Fix ISR lockup on Allwinner uart

2017-10-10 Thread Stefano Stabellini
On Wed, 4 Oct 2017, Awais Masood wrote: > This patch fixes an ISR lockup seen on Allwinner uart > > On Allwinner H5, serial driver goes into an infinite loop > when interrupts are enabled. The reason is a residual > "busy detect" interrupt. Since the condition UART_IIR_NOINT > will not be true unl

Re: [Xen-devel] [PATCH v3] xen/ns16550: Fix ISR lockup on Allwinner uart

2017-10-06 Thread Jan Beulich
>>> On 04.10.17 at 13:44, wrote: > This patch fixes an ISR lockup seen on Allwinner uart > > On Allwinner H5, serial driver goes into an infinite loop > when interrupts are enabled. The reason is a residual > "busy detect" interrupt. Since the condition UART_IIR_NOINT > will not be true unless th

[Xen-devel] [PATCH v3] xen/ns16550: Fix ISR lockup on Allwinner uart

2017-10-04 Thread Awais Masood
This patch fixes an ISR lockup seen on Allwinner uart On Allwinner H5, serial driver goes into an infinite loop when interrupts are enabled. The reason is a residual "busy detect" interrupt. Since the condition UART_IIR_NOINT will not be true unless this interrupt is cleared, the interrupt handler