From patchwork Thu Mar 19 02:34:48 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sungbo Eo X-Patchwork-Id: 11446405 From: Sungbo Eo To: Linus Walleij , Thomas Gleixner , Jason Cooper , Marc Zyngier , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-oxnas@groups.io Subject: [PATCH v2] irqchip/versatile-fpga: Handle chained IRQs properly Date: Thu, 19 Mar 2020 11:34:48 +0900 Message-Id: <20200319023448.1479701-1-mans0n@gorani.run> In-Reply-To: <002b72cab9896fa5ac76a52e0cb503ff@kernel.org> References: <002b72cab9896fa5ac76a52e0cb503ff@kernel.org> MIME-Version: 1.0 List-Id: Cc: Sungbo Eo , Neil Armstrong Sender: "linux-arm-kernel" Enclose the chained handler with chained_irq_{enter,exit}(), so that the muxed interrupts get properly acked. This patch also fixes a reboot bug on OX820 SoC, where the jiffies timer interrupt is never acked. The kernel waits a clock tick forever in calibrate_delay_converge(), which leads to a boot hang. Fixes: c41b16f8c9d9 ("ARM: integrator/versatile: consolidate FPGA IRQ handling code") Signed-off-by: Sungbo Eo Cc: Neil Armstrong --- v2: moved readl below chained_irq_enter() added Fixes tag drivers/irqchip/irq-versatile-fpga.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) --- a/drivers/irqchip/irq-versatile-fpga.c +++ b/drivers/irqchip/irq-versatile-fpga.c @@ -6,6 +6,7 @@ #include #include #include +#include #include #include #include @@ -68,12 +69,16 @@ static void fpga_irq_unmask(struct irq_d static void fpga_irq_handle(struct irq_desc *desc) { + struct irq_chip *chip = irq_desc_get_chip(desc); struct fpga_irq_data *f = irq_desc_get_handler_data(desc); - u32 status = readl(f->base + IRQ_STATUS); + u32 status; + chained_irq_enter(chip, desc); + + status = readl(f->base + IRQ_STATUS); if (status == 0) { do_bad_IRQ(desc); - return; + goto out; } do { @@ -82,6 +87,9 @@ static void fpga_irq_handle(struct irq_d status &= ~(1 << irq); generic_handle_irq(irq_find_mapping(f->domain, irq)); } while (status); + +out: + chained_irq_exit(chip, desc); } /*