[tip: irq/msi] platform-msi: Allocate MSI device data on first use

[tip-bot2 for Thomas Gleixner]

The following commit has been merged into the irq/msi branch of tip:

Commit-ID:     077aeadb6cacdee79acff3deb1b31581584fdb9c
Gitweb:        https://git.kernel.org/tip/077aeadb6cacdee79acff3deb1b31581584fdb9c
Author:        Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate:    Fri, 10 Dec 2021 23:18:58 +01:00
Committer:     Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitterDate: Thu, 16 Dec 2021 22:16:38 +01:00

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@xxxxxxxxxxxxx>
Tested-by: Nishanth Menon <nm@xxxxxx>
Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20211210221813.805529729@xxxxxxxxxxxxx

---
 drivers/base/platform-msi.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/base/platform-msi.c b/drivers/base/platform-msi.c
index f1f0876..3da2688 100644
--- a/drivers/base/platform-msi.c
+++ b/drivers/base/platform-msi.c
@@ -204,6 +204,8 @@ platform_msi_alloc_priv_data(struct device *dev, unsigned int nvec,
 			     irq_write_msi_msg_t write_msi_msg)
 {
 	struct platform_msi_priv_data *datap;
+	int err;
+
 	/*
 	 * Limit the number of interrupts to 2048 per device. Should we
 	 * need to bump this up, DEV_ID_SHIFT should be adjusted
@@ -218,6 +220,10 @@ platform_msi_alloc_priv_data(struct device *dev, unsigned int nvec,
 		return ERR_PTR(-EINVAL);
 	}
 
+	err = msi_setup_device_data(dev);
+	if (err)
+		return ERR_PTR(err);
+
 	/* Already had a helping of MSI? Greed... */
 	if (!list_empty(dev_to_msi_list(dev)))
 		return ERR_PTR(-EBUSY);
@@ -229,7 +235,7 @@ platform_msi_alloc_priv_data(struct device *dev, unsigned int nvec,
 	datap->devid = ida_simple_get(&platform_msi_devid_ida,
 				      0, 1 << DEV_ID_SHIFT, GFP_KERNEL);
 	if (datap->devid < 0) {
-		int err = datap->devid;
+		err = datap->devid;
 		kfree(datap);
 		return ERR_PTR(err);
 	}