Douglas Anderson <dianders@xxxxxxxxxxxx> wrote: > On wcn3990 we have "per_ce_irq = true". That makes the > ath10k_ce_interrupt_summary() function always return 0xfff. The > ath10k_ce_per_engine_service_any() function will see this and think > that _all_ copy engines have an interrupt. Without checking, the > ath10k_ce_per_engine_service() assumes that if it's called that the > "copy complete" (cc) interrupt fired. This combination seems bad. > > Let's add a check to make sure that the "copy complete" interrupt > actually fired in ath10k_ce_per_engine_service(). > > This might fix a hard-to-reproduce failure where it appears that the > copy complete handlers run before the copy is really complete. > Specifically a symptom was that we were seeing this on a Qualcomm > sc7180 board: > arm-smmu 15000000.iommu: Unhandled context fault: > fsr=0x402, iova=0x7fdd45780, fsynr=0x30003, cbfrsynra=0xc1, cb=10 > > Even on platforms that don't have wcn3990 this still seems like it > would be a sane thing to do. Specifically the current IRQ handler > comments indicate that there might be other misc interrupt sources > firing that need to be cleared. If one of those sources was the one > that caused the IRQ handler to be called it would also be important to > double-check that the interrupt we cared about actually fired. > > Tested-on: WCN3990 SNOC WLAN.HL.3.2.2-00490-QCAHLSWMTPL-1 > > Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx> > Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxxxxxx> Patch applied to ath-next branch of ath.git, thanks. 8f9ed93d09a9 ath10k: Wait until copy complete is actually done before completing -- https://patchwork.kernel.org/patch/11595887/ https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
