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Subject[PATCH] clocksource/drivers/sh_mtu2: Do not loop using platform_get_irq_by_name()
Date
As platform_get_irq_by_name() now prints an error when the interrupt
does not exist, looping over possibly non-existing interrupts causes the
printing of scary messages like:

sh_mtu2 fcff0000.timer: IRQ tgi1a not found
sh_mtu2 fcff0000.timer: IRQ tgi2a not found

Fix this by using the platform_irq_count() helper, to avoid touching
non-existent interrupts. Limit the returned number of interrupts to the
maximum number of channels currently supported by the driver in a
future-proof way, i.e. using ARRAY_SIZE() instead of a hardcoded number.

Fixes: 7723f4c5ecdb8d83 ("driver core: platform: Add an error message to platform_get_irq*()")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
This is a fix for v5.4.
---
drivers/clocksource/sh_mtu2.c | 16 +++++++++++-----
1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/clocksource/sh_mtu2.c b/drivers/clocksource/sh_mtu2.c
index 354b27d14a19bfce..62812f80b5cc0916 100644
--- a/drivers/clocksource/sh_mtu2.c
+++ b/drivers/clocksource/sh_mtu2.c
@@ -328,12 +328,13 @@ static int sh_mtu2_register(struct sh_mtu2_channel *ch, const char *name)
return 0;
}

+static const unsigned int sh_mtu2_channel_offsets[] = {
+ 0x300, 0x380, 0x000,
+};
+
static int sh_mtu2_setup_channel(struct sh_mtu2_channel *ch, unsigned int index,
struct sh_mtu2_device *mtu)
{
- static const unsigned int channel_offsets[] = {
- 0x300, 0x380, 0x000,
- };
char name[6];
int irq;
int ret;
@@ -356,7 +357,7 @@ static int sh_mtu2_setup_channel(struct sh_mtu2_channel *ch, unsigned int index,
return ret;
}

- ch->base = mtu->mapbase + channel_offsets[index];
+ ch->base = mtu->mapbase + sh_mtu2_channel_offsets[index];
ch->index = index;

return sh_mtu2_register(ch, dev_name(&mtu->pdev->dev));
@@ -408,7 +409,12 @@ static int sh_mtu2_setup(struct sh_mtu2_device *mtu,
}

/* Allocate and setup the channels. */
- mtu->num_channels = 3;
+ ret = platform_irq_count(pdev);
+ if (ret < 0)
+ goto err_unmap;
+
+ mtu->num_channels = min_t(unsigned int, ret,
+ ARRAY_SIZE(sh_mtu2_channel_offsets));

mtu->channels = kcalloc(mtu->num_channels, sizeof(*mtu->channels),
GFP_KERNEL);
--
2.17.1
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