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f1f97db627
OpenWRT's developer guide prefers having actual patches so they an be sent upstream more easily. However, in this case, Adding proper fields also allows for `git am` to properly function. Some of these patches are quite old, and lack much traceable history. This commit tries to rectify that, by digging in the history to find where and how it was first added. It is by no means perfect and also shows some patches that should have been long gone. Signed-off-by: Olliver Schinagl <oliver@schinagl.nl>
52 lines
1.9 KiB
Diff
52 lines
1.9 KiB
Diff
From bde6311569ef25a00c3beaeabfd6b78b19651872 Mon Sep 17 00:00:00 2001
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From: Sander Vanheule <sander@svanheule.net>
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Date: Sun, 29 May 2022 19:38:09 +0200
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Subject: [PATCH] realtek: don't unmask non-maskable GPIO IRQs
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On uniprocessor builds, for_each_cpu(cpu, mask) will assume 'mask'
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always contains exactly one CPU, and ignore the actual mask contents.
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This causes the loop to run, even when it shouldn't on an empty mask,
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and tries to access an uninitialised pointer.
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Fix this by wrapping the loop in a cpumask_empty() check, to ensure it
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will not run on uniprocessor builds if the CPU mask is empty.
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Fixes: af6cd37f42f3 ("realtek: replace RTL93xx GPIO patches")
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Reported-by: INAGAKI Hiroshi <musashino.open@gmail.com>
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Reported-by: Robert Marko <robimarko@gmail.com>
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Tested-by: Robert Marko <robimarko@gmail.com>
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Submitted-by: Sander Vanheule <sander@svanheule.net>
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---
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drivers/gpio/gpio-realtek-otto.c | 9 +++++++++++--
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1 file changed, 11 insertions(+), 2 deletions(-)
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--- a/drivers/gpio/gpio-realtek-otto.c
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+++ b/drivers/gpio/gpio-realtek-otto.c
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@@ -304,6 +304,7 @@ static int realtek_gpio_irq_set_affinity
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static int realtek_gpio_irq_init(struct gpio_chip *gc)
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{
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struct realtek_gpio_ctrl *ctrl = gpiochip_get_data(gc);
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+ void __iomem *irq_cpu_mask;
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unsigned int port;
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int cpu;
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@@ -311,8 +312,16 @@ static int realtek_gpio_irq_init(struct
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realtek_gpio_write_imr(ctrl, port, 0, 0);
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realtek_gpio_clear_isr(ctrl, port, GENMASK(7, 0));
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- for_each_cpu(cpu, &ctrl->cpu_irq_maskable)
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- iowrite8(GENMASK(7, 0), realtek_gpio_irq_cpu_mask(ctrl, port, cpu));
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+ /*
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+ * Uniprocessor builds assume a mask always contains one CPU,
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+ * so only start the loop if we have at least one maskable CPU.
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+ */
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+ if(!cpumask_empty(&ctrl->cpu_irq_maskable)) {
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+ for_each_cpu(cpu, &ctrl->cpu_irq_maskable) {
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+ irq_cpu_mask = realtek_gpio_irq_cpu_mask(ctrl, port, cpu);
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+ iowrite8(GENMASK(7, 0), irq_cpu_mask);
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+ }
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+ }
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}
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return 0;
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