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| author | Sergey Shtylyov <s.shtylyov@omp.ru> | 2022-03-11 22:35:29 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-04-27 10:51:57 +0300 |
| commit | ce753ad1549cbe9ccaea4c06a1f5fa47432c8289 (patch) | |
| tree | ec1a5b28b9866af9dfb19d25486cb0cc4a4d1ea3 /drivers | |
| parent | a72b6dff4089e6c3455e73ea97b08623b4fed699 (diff) | |
| download | linux-ce753ad1549cbe9ccaea4c06a1f5fa47432c8289.tar.xz | |
platform: finally disallow IRQ0 in platform_get_irq() and its ilk
The commit a85a6c86c25b ("driver core: platform: Clarify that IRQ 0 is
invalid") only calls WARN() when IRQ0 is about to be returned, however
using IRQ0 is considered invalid (according to Linus) outside the arch/
code where it's used by the i8253 drivers. Many driver subsystems treat
0 specially (e.g. as an indication of the polling mode by libata), so
the users of platform_get_irq[_byname]() in them would have to filter
out IRQ0 explicitly and this (quite obviously) doesn't scale...
Let's finally get this straight and return -EINVAL instead of IRQ0!
Fixes: a85a6c86c25b ("driver core: platform: Clarify that IRQ 0 is invalid")
Acked-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Link: https://lore.kernel.org/r/025679e1-1f0a-ae4b-4369-01164f691511@omp.ru
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/base/platform.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/base/platform.c b/drivers/base/platform.c index b684157b7f2f..5259f1f93187 100644 --- a/drivers/base/platform.c +++ b/drivers/base/platform.c @@ -231,7 +231,8 @@ int platform_get_irq_optional(struct platform_device *dev, unsigned int num) out_not_found: ret = -ENXIO; out: - WARN(ret == 0, "0 is an invalid IRQ number\n"); + if (WARN(!ret, "0 is an invalid IRQ number\n")) + return -EINVAL; return ret; } EXPORT_SYMBOL_GPL(platform_get_irq_optional); @@ -446,7 +447,8 @@ static int __platform_get_irq_byname(struct platform_device *dev, r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name); if (r) { - WARN(r->start == 0, "0 is an invalid IRQ number\n"); + if (WARN(!r->start, "0 is an invalid IRQ number\n")) + return -EINVAL; return r->start; } |