1 files changed, 36 insertions, 0 deletions

diff --git a/drivers/misc/ioc4.c b/drivers/misc/ioc4.c
index 6f76573e7c8a..60b0b1a4fb3a 100644
--- a/drivers/misc/ioc4.c
+++ b/drivers/misc/ioc4.c
@@ -269,6 +269,16 @@ ioc4_variant(struct ioc4_driver_data *idd)
         return IOC4_VARIANT_PCI_RT;
 }
 
+static void
+ioc4_load_modules(struct work_struct *work)
+{
+        /* arg just has to be freed */
+
+        request_module("sgiioc4");
+
+        kfree(work);
+}
+
 /* Adds a new instance of an IOC4 card */
 static int
 ioc4_probe(struct pci_dev *pdev, const struct pci_device_id *pci_id)
@@ -378,6 +388,30 @@ ioc4_probe(struct pci_dev *pdev, const struct pci_device_id *pci_id)
         }
         mutex_unlock(&ioc4_mutex);
 
+        /* Request sgiioc4 IDE driver on boards that bring that functionality
+         * off of IOC4.  The root filesystem may be hosted on a drive connected
+         * to IOC4, so we need to make sure the sgiioc4 driver is loaded as it
+         * won't be picked up by modprobes due to the ioc4 module owning the
+         * PCI device.
+         */
+        if (idd->idd_variant != IOC4_VARIANT_PCI_RT) {
+                struct work_struct *work;
+                work = kzalloc(sizeof(struct work_struct), GFP_KERNEL);
+                if (!work) {
+                        printk(KERN_WARNING
+                               "%s: IOC4 unable to allocate memory for "
+                               "load of sub-modules.\n", __func__);
+                } else {
+                        /* Request the module from a work procedure as the
+                         * modprobe goes out to a userland helper and that
+                         * will hang if done directly from ioc4_probe().
+                         */
+                        printk(KERN_INFO "IOC4 loading sgiioc4 submodule\n");
+                        INIT_WORK(work, ioc4_load_modules);
+                        schedule_work(work);
+                }
+        }
+
         return 0;
 
 out_misc_region:
@@ -462,6 +496,8 @@ ioc4_init(void)
 static void __devexit
 ioc4_exit(void)
 {
+        /* Ensure ioc4_load_modules() has completed before exiting */
+        flush_scheduled_work();
         pci_unregister_driver(&ioc4_driver);
 }