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author | Marc Zyngier <marc.zyngier@arm.com> | 2015-11-23 08:26:03 (GMT) |
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committer | Marc Zyngier <marc.zyngier@arm.com> | 2015-12-16 15:29:44 (GMT) |
commit | 72f57f2f430f9d262fe3c8dd957f57cbdc1f5f97 (patch) | |
tree | 47a5db996facb075ef44d51974de96bc497a1c95 /drivers/base | |
parent | ab6484ee84c17a948c4235c20928f6aee295ced7 (diff) | |
download | linux-72f57f2f430f9d262fe3c8dd957f57cbdc1f5f97.tar.xz |
platform-msi: Factor out allocation/free of private data
As we're going to have multiple paths to allocate/free the
platform-msi private data, factor this out into separate
utility functions.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'drivers/base')
-rw-r--r-- | drivers/base/platform-msi.c | 94 |
1 files changed, 53 insertions, 41 deletions
diff --git a/drivers/base/platform-msi.c b/drivers/base/platform-msi.c index 6148c78..44b8c0d 100644 --- a/drivers/base/platform-msi.c +++ b/drivers/base/platform-msi.c @@ -189,21 +189,11 @@ struct irq_domain *platform_msi_create_irq_domain(struct fwnode_handle *fwnode, return domain; } -/** - * platform_msi_domain_alloc_irqs - Allocate MSI interrupts for @dev - * @dev: The device for which to allocate interrupts - * @nvec: The number of interrupts to allocate - * @write_msi_msg: Callback to write an interrupt message for @dev - * - * Returns: - * Zero for success, or an error code in case of failure - */ -int platform_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec, - irq_write_msi_msg_t write_msi_msg) +static struct platform_msi_priv_data * +platform_msi_alloc_priv_data(struct device *dev, unsigned int nvec, + irq_write_msi_msg_t write_msi_msg) { - struct platform_msi_priv_data *priv_data; - int err; - + struct platform_msi_priv_data *datap; /* * Limit the number of interrupts to 256 per device. Should we * need to bump this up, DEV_ID_SHIFT should be adjusted @@ -211,33 +201,62 @@ int platform_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec, * capable devices). */ if (!dev->msi_domain || !write_msi_msg || !nvec || nvec > MAX_DEV_MSIS) - return -EINVAL; + return ERR_PTR(-EINVAL); if (dev->msi_domain->bus_token != DOMAIN_BUS_PLATFORM_MSI) { dev_err(dev, "Incompatible msi_domain, giving up\n"); - return -EINVAL; + return ERR_PTR(-EINVAL); } /* Already had a helping of MSI? Greed... */ if (!list_empty(dev_to_msi_list(dev))) - return -EBUSY; + return ERR_PTR(-EBUSY); + + datap = kzalloc(sizeof(*datap), GFP_KERNEL); + if (!datap) + return ERR_PTR(-ENOMEM); + + datap->devid = ida_simple_get(&platform_msi_devid_ida, + 0, 1 << DEV_ID_SHIFT, GFP_KERNEL); + if (datap->devid < 0) { + int err = datap->devid; + kfree(datap); + return ERR_PTR(err); + } - priv_data = kzalloc(sizeof(*priv_data), GFP_KERNEL); - if (!priv_data) - return -ENOMEM; + datap->write_msg = write_msi_msg; - priv_data->devid = ida_simple_get(&platform_msi_devid_ida, - 0, 1 << DEV_ID_SHIFT, GFP_KERNEL); - if (priv_data->devid < 0) { - err = priv_data->devid; - goto out_free_data; - } + return datap; +} + +static void platform_msi_free_priv_data(struct platform_msi_priv_data *data) +{ + ida_simple_remove(&platform_msi_devid_ida, data->devid); + kfree(data); +} + +/** + * platform_msi_domain_alloc_irqs - Allocate MSI interrupts for @dev + * @dev: The device for which to allocate interrupts + * @nvec: The number of interrupts to allocate + * @write_msi_msg: Callback to write an interrupt message for @dev + * + * Returns: + * Zero for success, or an error code in case of failure + */ +int platform_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec, + irq_write_msi_msg_t write_msi_msg) +{ + struct platform_msi_priv_data *priv_data; + int err; - priv_data->write_msg = write_msi_msg; + priv_data = platform_msi_alloc_priv_data(dev, nvec, write_msi_msg); + if (IS_ERR(priv_data)) + return PTR_ERR(priv_data); err = platform_msi_alloc_descs(dev, nvec, priv_data); if (err) - goto out_free_id; + goto out_free_priv_data; err = msi_domain_alloc_irqs(dev->msi_domain, dev, nvec); if (err) @@ -247,10 +266,8 @@ int platform_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec, out_free_desc: platform_msi_free_descs(dev, 0, nvec); -out_free_id: - ida_simple_remove(&platform_msi_devid_ida, priv_data->devid); -out_free_data: - kfree(priv_data); +out_free_priv_data: + platform_msi_free_priv_data(priv_data); return err; } @@ -261,16 +278,11 @@ out_free_data: */ void platform_msi_domain_free_irqs(struct device *dev) { - struct msi_desc *desc; - - desc = first_msi_entry(dev); - if (desc) { - struct platform_msi_priv_data *data; - - data = desc->platform.msi_priv_data; + if (!list_empty(dev_to_msi_list(dev))) { + struct msi_desc *desc; - ida_simple_remove(&platform_msi_devid_ida, data->devid); - kfree(data); + desc = first_msi_entry(dev); + platform_msi_free_priv_data(desc->platform.msi_priv_data); } msi_domain_free_irqs(dev->msi_domain, dev); |