diff options
Diffstat (limited to 'target/linux/generic')
| -rw-r--r-- | target/linux/generic/pending-4.14/343-MIPS-ath79-Fix-potentially-missed-IRQ-handling-durin.patch | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/target/linux/generic/pending-4.14/343-MIPS-ath79-Fix-potentially-missed-IRQ-handling-durin.patch b/target/linux/generic/pending-4.14/343-MIPS-ath79-Fix-potentially-missed-IRQ-handling-durin.patch new file mode 100644 index 0000000000..b1389bc28d --- /dev/null +++ b/target/linux/generic/pending-4.14/343-MIPS-ath79-Fix-potentially-missed-IRQ-handling-durin.patch @@ -0,0 +1,57 @@ +From 3fe7841bf5a582dc7fd198e5bf70162ea418a22a Mon Sep 17 00:00:00 2001 +From: Koen Vandeputte <koen.vandeputte@ncentric.com> +Date: Wed, 11 Sep 2019 11:02:19 +0200 +Subject: [PATCH] MIPS: ath79: Fix potentially missed IRQ handling during + dispatch + +If both interrupts are set in the current implementation +only the 1st will be handled and the 2nd will be skipped +due to the "if else" condition. + +Fix this by using the same approach as done for QCA955x +just below it. + +Fixes: fce5cc6e0ddc ("MIPS: ath79: add IRQ handling code for AR934X") +Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com> +CC: Felix Fietkau <nbd@nbd.name> +CC: Gabor Juhos <juhosg@freemail.hu> +CC: James Hogan <jhogan@kernel.org> +CC: Paul Burton <paul.burton@mips.com> +CC: Ralf Baechle <ralf@linux-mips.org> +CC: stable@vger.kernel.org # v3.2+ +--- + arch/mips/ath79/irq.c | 12 +++++++++--- + 1 file changed, 9 insertions(+), 3 deletions(-) + +diff --git a/arch/mips/ath79/irq.c b/arch/mips/ath79/irq.c +index 2dfff1f19004..a03a6bcaf6fd 100644 +--- a/arch/mips/ath79/irq.c ++++ b/arch/mips/ath79/irq.c +@@ -32,15 +32,21 @@ static void ar934x_ip2_irq_dispatch(struct irq_desc *desc) + u32 status; + + status = ath79_reset_rr(AR934X_RESET_REG_PCIE_WMAC_INT_STATUS); ++ status &= AR934X_PCIE_WMAC_INT_PCIE_ALL | AR934X_PCIE_WMAC_INT_WMAC_ALL; ++ ++ if (status == 0) { ++ spurious_interrupt(); ++ return; ++ } + + if (status & AR934X_PCIE_WMAC_INT_PCIE_ALL) { + ath79_ddr_wb_flush(3); + generic_handle_irq(ATH79_IP2_IRQ(0)); +- } else if (status & AR934X_PCIE_WMAC_INT_WMAC_ALL) { ++ } ++ ++ if (status & AR934X_PCIE_WMAC_INT_WMAC_ALL) { + ath79_ddr_wb_flush(4); + generic_handle_irq(ATH79_IP2_IRQ(1)); +- } else { +- spurious_interrupt(); + } + } + +-- +2.17.1 + |