From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dmitry Osipenko , Thierry Reding , Sasha Levin Subject: [PATCH 4.9 117/144] memory: tegra: Do not handle spurious interrupts Date: Wed, 1 Aug 2018 18:52:24 +0200 Message-Id: <20180801164957.618758660@linuxfoundation.org> In-Reply-To: <20180801164949.023217860@linuxfoundation.org> References: <20180801164949.023217860@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Dmitry Osipenko [ Upstream commit bf3fbdfbec947cdd04b2f2c4bce11534c8786eee ] The ISR reads interrupts-enable mask, but doesn't utilize it. Apply the mask to the interrupt status and don't handle interrupts that MC driver haven't asked for. Kernel would disable spurious MC IRQ and report the error. This would happen only in a case of a very severe bug. Signed-off-by: Dmitry Osipenko Signed-off-by: Thierry Reding Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/memory/tegra/mc.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/drivers/memory/tegra/mc.c +++ b/drivers/memory/tegra/mc.c @@ -252,8 +252,11 @@ static irqreturn_t tegra_mc_irq(int irq, unsigned int bit; /* mask all interrupts to avoid flooding */ - status = mc_readl(mc, MC_INTSTATUS); mask = mc_readl(mc, MC_INTMASK); + status = mc_readl(mc, MC_INTSTATUS) & mask; + + if (!status) + return IRQ_NONE; for_each_set_bit(bit, &status, 32) { const char *error = status_names[bit] ?: "unknown";