static int dax_open()

in char/oradax.c [642:680]

• 31 lines of code
• 5 McCabe index (conditional complexity)

static int dax_open(struct inode *inode, struct file *f)
{
	struct dax_ctx *ctx = NULL;
	int i;

	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
	if (ctx == NULL)
		goto done;

	ctx->ccb_buf = kcalloc(DAX_MAX_CCBS, sizeof(struct dax_ccb),
			       GFP_KERNEL);
	if (ctx->ccb_buf == NULL)
		goto done;

	ctx->ccb_buf_ra = virt_to_phys(ctx->ccb_buf);
	dax_dbg("ctx->ccb_buf=0x%p, ccb_buf_ra=0x%llx",
		(void *)ctx->ccb_buf, ctx->ccb_buf_ra);

	/* allocate CCB completion area buffer */
	ctx->ca_buf = kzalloc(DAX_MMAP_LEN, GFP_KERNEL);
	if (ctx->ca_buf == NULL)
		goto alloc_error;
	for (i = 0; i < DAX_CA_ELEMS; i++)
		ctx->ca_buf[i].status = CCA_STAT_COMPLETED;

	ctx->ca_buf_ra = virt_to_phys(ctx->ca_buf);
	dax_dbg("ctx=0x%p, ctx->ca_buf=0x%p, ca_buf_ra=0x%llx",
		(void *)ctx, (void *)ctx->ca_buf, ctx->ca_buf_ra);

	ctx->owner = current;
	f->private_data = ctx;
	return 0;

alloc_error:
	kfree(ctx->ccb_buf);
done:
	kfree(ctx);
	return -ENOMEM;
}