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    Subject[PATCH v6 02/12] amba: Use driver_set_override() instead of open-coding
    Date
    Use a helper to set driver_override to reduce the amount of duplicated
    code. Make the driver_override field const char, because it is not
    modified by the core and it matches other subsystems.

    Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
    ---
    drivers/amba/bus.c | 28 ++++------------------------
    include/linux/amba/bus.h | 6 +++++-
    2 files changed, 9 insertions(+), 25 deletions(-)

    diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
    index d3bd14aaabf6..f3d26d698b77 100644
    --- a/drivers/amba/bus.c
    +++ b/drivers/amba/bus.c
    @@ -94,31 +94,11 @@ static ssize_t driver_override_store(struct device *_dev,
    const char *buf, size_t count)
    {
    struct amba_device *dev = to_amba_device(_dev);
    - char *driver_override, *old, *cp;
    -
    - /* We need to keep extra room for a newline */
    - if (count >= (PAGE_SIZE - 1))
    - return -EINVAL;
    -
    - driver_override = kstrndup(buf, count, GFP_KERNEL);
    - if (!driver_override)
    - return -ENOMEM;
    -
    - cp = strchr(driver_override, '\n');
    - if (cp)
    - *cp = '\0';
    -
    - device_lock(_dev);
    - old = dev->driver_override;
    - if (strlen(driver_override)) {
    - dev->driver_override = driver_override;
    - } else {
    - kfree(driver_override);
    - dev->driver_override = NULL;
    - }
    - device_unlock(_dev);
    + int ret;

    - kfree(old);
    + ret = driver_set_override(_dev, &dev->driver_override, buf, count);
    + if (ret)
    + return ret;

    return count;
    }
    diff --git a/include/linux/amba/bus.h b/include/linux/amba/bus.h
    index 6562f543c3e0..93799a72ff82 100644
    --- a/include/linux/amba/bus.h
    +++ b/include/linux/amba/bus.h
    @@ -70,7 +70,11 @@ struct amba_device {
    unsigned int cid;
    struct amba_cs_uci_id uci;
    unsigned int irq[AMBA_NR_IRQS];
    - char *driver_override;
    + /*
    + * Driver name to force a match. Do not set directly, because core
    + * frees it. Use driver_set_override() to set or clear it.
    + */
    + const char *driver_override;
    };

    struct amba_driver {
    --
    2.32.0
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