megasas_clear_intr_skinny(struct megasas_instance *instance)
{
	u32 status;
	u32 mfiStatus = 0;
	struct megasas_register_set __iomem *regs;
	regs = instance->reg_set;

	/*
	 * Check if it is our interrupt
	 */
	status = readl(&regs->outbound_intr_status);

	if (!(status & MFI_SKINNY_ENABLE_INTERRUPT_MASK)) {
		return 0;
	}

	/*
	 * Check if it is our interrupt
	 */
	if ((megasas_read_fw_status_reg_skinny(instance) & MFI_STATE_MASK) ==
	    MFI_STATE_FAULT) {
		mfiStatus = MFI_INTR_FLAG_FIRMWARE_STATE_CHANGE;
	} else
		mfiStatus = MFI_INTR_FLAG_REPLY_MESSAGE;

	/*
	 * Clear the interrupt by writing back the same value
	 */
	writel(status, &regs->outbound_intr_status);

	/*
	 * dummy read to flush PCI
	 */
	readl(&regs->outbound_intr_status);

	return mfiStatus;
}

The product dereferences a pointer that it expects to be valid but is NULL.