axonram: Fix gendisk handling

It is invalid to call del_gendisk() when disk->queue is NULL. Fix error
handling in axon_ram_probe() to avoid doing that.

Also del_gendisk() does not drop a reference to gendisk allocated by
alloc_disk(). That has to be done by put_disk(). Add that call where
needed.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/arch/powerpc/sysdev/axonram.c b/arch/powerpc/sysdev/axonram.c
index ada29eaed6e280c08f6d3ee5671c58da9eb06e38..f523ac88315070873eede1c978312569d48953a7 100644 (file)
--- a/arch/powerpc/sysdev/axonram.c
+++ b/arch/powerpc/sysdev/axonram.c
@@ -274,7 +274,9 @@ failed:
                        if (bank->disk->major > 0)
                                unregister_blkdev(bank->disk->major,
                                                bank->disk->disk_name);
-                       del_gendisk(bank->disk);
+                       if (bank->disk->flags & GENHD_FL_UP)
+                               del_gendisk(bank->disk);
+                       put_disk(bank->disk);
                }
                device->dev.platform_data = NULL;
                if (bank->io_addr != 0)
@@ -299,6 +301,7 @@ axon_ram_remove(struct platform_device *device)
        device_remove_file(&device->dev, &dev_attr_ecc);
        free_irq(bank->irq_id, device);
        del_gendisk(bank->disk);
+       put_disk(bank->disk);
        iounmap((void __iomem *) bank->io_addr);
        kfree(bank);