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platform-msi: Allocate MSI device data on first use
Allocate the MSI device data on first invocation of the allocation function for platform MSI private data. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Nishanth Menon <nm@ti.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Link: https://lore.kernel.org/r/20211210221813.805529729@linutronix.de
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@ -204,6 +204,8 @@ platform_msi_alloc_priv_data(struct device *dev, unsigned int nvec,
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irq_write_msi_msg_t write_msi_msg)
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{
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struct platform_msi_priv_data *datap;
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int err;
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/*
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* Limit the number of interrupts to 2048 per device. Should we
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* need to bump this up, DEV_ID_SHIFT should be adjusted
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@ -218,6 +220,10 @@ platform_msi_alloc_priv_data(struct device *dev, unsigned int nvec,
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return ERR_PTR(-EINVAL);
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}
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err = msi_setup_device_data(dev);
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if (err)
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return ERR_PTR(err);
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/* Already had a helping of MSI? Greed... */
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if (!list_empty(dev_to_msi_list(dev)))
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return ERR_PTR(-EBUSY);
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@ -229,7 +235,7 @@ platform_msi_alloc_priv_data(struct device *dev, unsigned int nvec,
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datap->devid = ida_simple_get(&platform_msi_devid_ida,
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0, 1 << DEV_ID_SHIFT, GFP_KERNEL);
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if (datap->devid < 0) {
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int err = datap->devid;
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err = datap->devid;
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kfree(datap);
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return ERR_PTR(err);
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}
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