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clocksource/drivers/sh_mtu2: Do not loop using platform_get_irq_by_name() 

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: 7723f4c5ec ("driver core: platform: Add an error message to platform_get_irq*()")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20191016143003.28561-1-geert+renesas@glider.be
This commit is contained in:
Geert Uytterhoeven 2019-10-16 16:30:03 +02:00 committed by Daniel Lezcano
parent 41d49e7939
commit 7693de9f7a
1 changed files with 11 additions and 5 deletions
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16
drivers/clocksource/sh_mtu2.c
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@ -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);