Re: [PATCH] Power5,Power6 BSR driver

Hi, mainly a couple of coding style things, but one minor bug (I
think).

jschopp@austin.ibm.com wrote:

From: Sonny Rao <redacted>

+static int bsr_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+	unsigned long size   = vma->vm_end - vma->vm_start;
+	struct bsr_dev *dev = filp->private_data;
+
+	if (size > dev->bsr_len || (size & (PAGE_SIZE-1)))
+		return -EINVAL;
+
+	vma->vm_flags |= (VM_IO | VM_DONTEXPAND);
+	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+
+	if (io_remap_pfn_range(vma, vma->vm_start, dev->bsr_addr >> PAGE_SHIFT,
+			       size, vma->vm_page_prot))
+	    return -EAGAIN;

Indentation is wrong.

+static void bsr_cleanup_devs(void)
+{
+	int i;
+	for (i=0 ; i < num_bsr_devs; i++) {

             i = 0

+		struct bsr_dev *cur = bsr_devs + i;
+		if (cur->bsr_device) {
+			cdev_del(&cur->bsr_cdev);
+			device_del(cur->bsr_device);
+		}
+	}
+
+	kfree(bsr_devs);
+}
+
+static int bsr_create_devs(struct device_node *bn)
+{
+	int reg_len, bsr_stride_len, bsr_bytes_len;
+	const u64 *reg;
+	const u32 *bsr_stride;
+	const u32 *bsr_bytes;
+	unsigned i;
+
+	reg        = of_get_property(bn, "reg", &reg_len);
+	bsr_stride = of_get_property(bn, "ibm,lock-stride", &bsr_stride_len);
+	bsr_bytes  = of_get_property(bn, "ibm,#lock-bytes", &bsr_bytes_len);
+
+	if (!reg || !bsr_stride || !bsr_bytes ||
+	    (bsr_stride_len != bsr_bytes_len) ||
+	    (bsr_stride_len/4 != reg_len/16)) {

             bsr_stride_len / 4 != reg_len / 16

+		printk(KERN_ERR "bsr of-node has missing/incorrect property\n");
+		return -ENODEV;
+	}

...

+static int __init bsr_init(void)
+{
+	struct device_node *np;
+	dev_t bsr_dev = MKDEV(bsr_major, 0);
+	int ret = -ENODEV;
+	int result;
+
+	np = of_find_compatible_node(NULL, "ibm,bsr", "ibm,bsr");
+	if (!np)
+		goto out_err;
+
+	bsr_class = class_create(THIS_MODULE, "bsr");
+	if (IS_ERR(bsr_class)) {
+		printk(KERN_ERR "class_create() failed for bsr_class\n");
+		goto out_err;

At this point I think you can leak a reference to np.

+	}
+	bsr_class->dev_attrs = bsr_dev_attrs;
+
+	result = alloc_chrdev_region(&bsr_dev, 0, BSR_MAX_DEVS, "bsr");
+	bsr_major = MAJOR(bsr_dev);
+	if (result < 0) {
+		printk(KERN_ERR "alloc_chrdev_region() failed for bsr\n");
+		goto out_err_1;
+	}
+
+	if ((ret = bsr_create_devs(np)) < 0)
+		goto out_err_2;
+
+	of_node_put(np);
+
+	return 0;
+
+ out_err_2:
+	unregister_chrdev_region(bsr_dev, BSR_MAX_DEVS);
+
+ out_err_1:
+	class_destroy(bsr_class);
+	of_node_put(np);
+
+ out_err:
+
+	return ret;
+}