On Mon, Feb 18, 2019 at 08:45:40PM +0300, Sergei Shtylyov wrote:
> I have encountered an interrupt storm during the eMMC chip probing (and
> the chip finally didn't get detected).  It turned out that U-Boot left
> the DMAC interrupts enabled while the Linux driver  didn't use those.
> The SDHI driver's interrupt handler somehow assumes that, even if an
> SDIO interrupt didn't happen, it should return IRQ_HANDLED.  I think
> that if none of the enabled interrupts happened and got handled, we
> should return IRQ_NONE -- that way the kernel IRQ code recoginizes
> a spurious interrupt and masks it off pretty quickly...
> 
> Fixes: 7729c7a232a9 ("mmc: tmio: Provide separate interrupt handlers")
> Signed-off-by: Sergei Shtylyov <sergei.shtyl...@cogentembedded.com>

Tested on a Lager board (R-Car H2, microSD card) -> no regressions
Also, Salvator-XS (R-Car M3N, SDR50 SDIO WIFI card)
  -> could still be detected

Reviewed-by: Wolfram Sang <wsa+rene...@sang-engineering.com>
Tested-by: Wolfram Sang <wsa+rene...@sang-engineering.com>

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