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Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1i6wXa-0002Ij-8z; Sun, 08 Sep 2019 12:43:38 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1i6wXW-0002Hd-OW; Sun, 08 Sep 2019 12:43:36 +0000 Received: from localhost (unknown [62.28.240.114]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1B0E5218AE; Sun, 8 Sep 2019 12:43:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1567946612; bh=YZJIXJ17E7a0+EEK2SrgMQvwGAvnZmivE5QpgZgWL18=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=sJPQiuctj6q06P97XlnT7X3ZvfZePzwL2AzOgd6W+yTGY0bxENK/gSSq80wm2eode vsG7sGKc3N80gjm4jTzgb4b3H1RfVNA69DwnCCqlU8NeTfjotGMQezjddCYbCQTFfB 2UVCp3LBPMvlBuU42pC3Z2FV2tZNJhERcjnLedIw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Subject: [PATCH 4.4 17/23] spi: bcm2835aux: ensure interrupts are enabled for shared handler Date: Sun, 8 Sep 2019 13:41:52 +0100 Message-Id: <20190908121100.841586731@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20190908121052.898169328@linuxfoundation.org> References: <20190908121052.898169328@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190908_054334_822829_77217500 X-CRM114-Status: GOOD ( 14.72 ) X-Spam-Score: -1.4 (-) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (-1.4 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at https://www.dnswl.org/, high trust [198.145.29.99 listed in list.dnswl.org] 3.6 RCVD_IN_SBL_CSS RBL: Received via a relay in Spamhaus SBL-CSS [62.28.240.114 listed in zen.spamhaus.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.0 DKIMWL_WL_HIGH DKIMwl.org - Whitelisted High sender X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Stefan Wahren , Rob Herring , Florian Fainelli , Scott Branden , Sasha Levin , Marc Zyngier , Greg Kroah-Hartman , Alexander Graf , stable@vger.kernel.org, linux-spi@vger.kernel.org, Eric Anholt , Mark Brown , bcm-kernel-feedback-list@broadcom.com, linux-rpi-kernel@lists.infradead.org, Ray Jui , linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org [ Upstream commit bc519d9574618e47a0c788000fb78da95e18d953 ] The BCM2835 AUX SPI has a shared interrupt line (with AUX UART). Downstream fixes this with an AUX irqchip to demux the IRQ sources and a DT change which breaks compatibility with older kernels. The AUX irqchip was already rejected for upstream[1] and the DT change would break working systems if the DTB is updated to a newer one. The latter issue was brought to my attention by Alex Graf. The root cause however is a bug in the shared handler. Shared handlers must check that interrupts are actually enabled before servicing the interrupt. Add a check that the TXEMPTY or IDLE interrupts are enabled. [1] https://patchwork.kernel.org/patch/9781221/ Cc: Alexander Graf Cc: Marc Zyngier Cc: Mark Brown Cc: Eric Anholt Cc: Stefan Wahren Cc: Florian Fainelli Cc: Ray Jui Cc: Scott Branden Cc: bcm-kernel-feedback-list@broadcom.com Cc: linux-spi@vger.kernel.org Cc: linux-rpi-kernel@lists.infradead.org Cc: linux-arm-kernel@lists.infradead.org Signed-off-by: Rob Herring Reviewed-by: Eric Anholt Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/spi/spi-bcm2835aux.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/spi/spi-bcm2835aux.c b/drivers/spi/spi-bcm2835aux.c index 7de6f8472a810..6f4c6aa801f14 100644 --- a/drivers/spi/spi-bcm2835aux.c +++ b/drivers/spi/spi-bcm2835aux.c @@ -187,6 +187,11 @@ static irqreturn_t bcm2835aux_spi_interrupt(int irq, void *dev_id) struct bcm2835aux_spi *bs = spi_master_get_devdata(master); irqreturn_t ret = IRQ_NONE; + /* IRQ may be shared, so return if our interrupts are disabled */ + if (!(bcm2835aux_rd(bs, BCM2835_AUX_SPI_CNTL1) & + (BCM2835_AUX_SPI_CNTL1_TXEMPTY | BCM2835_AUX_SPI_CNTL1_IDLE))) + return ret; + /* check if we have data to read */ while (bs->rx_len && (!(bcm2835aux_rd(bs, BCM2835_AUX_SPI_STAT) &