Hi Vineet, On Fri, 2017-08-25 at 10:13 -0700, Vineet Gupta wrote: > On 08/25/2017 07:22 AM, Alexey Brodkin wrote: > > > > From: Alexey Brodkin <Alexey.Brodkin at synopsys.com> > > > > ARC cores on reset have all interrupt lines of built-in INTC enabled. > > Which means once we globally enable interrupts (very early on boot) > > faulty hardware blocks may trigger an interrupt that Linux kernel > > cannot handle yet as corresponding handler is not yet installed. > > > > In that case system falls in "interrupt storm" and basically never > > does anything useful except entering and exiting generic IRQ handling > > code. > > > > One real example of that kind of problematic hardware is DW GMAC which > > also has interrupts enabled on reset and if Ethernet PHY informs GMAC > > about link state, GMAC immediately reports that upstream to ARC core > > and here we are. > > > > Now with that change we mask all individual IRQ lines making entire > > system more fool-proof. > > > > [This patch was motivated by Adaptrum platform support] > > > > Signed-off-by: Alexey Brodkin <abrodkin at synopsys.com> > > Cc: Eugeniy Paltsev <paltsev at synopsys.com> > > Tested-by: Alexandru Gagniuc <alex.g at adaptrum.com> > > Signed-off-by: Vineet Gupta <vgupta at synopsys.com> > > v1 was merged in mainline this week - please provide a fixup patch on top of? > mainline / for-curr ! Ooops, didn't see that. Will do shortly. -Alexey
